IRC 1091 Wash Sale Rule: Digital Assets, Crypto, and Form 8949 Practitioner Guide

IRC 1091 is the wash sale rule: it disallows a capital loss when the taxpayer sells a security at a loss and repurchases the same or a substantially identical security within the 61-day window surrounding the sale. The rule does not permanently eliminate the loss -- it defers recognition by increasing the basis of the replacement security and tacking the original holding period. But for practitioners advising clients with active trading portfolios, the interaction of the wash sale rule with digital asset positions is the most consequential planning issue of the current tax environment: under current IRS guidance, cryptocurrency and other digital assets are not securities subject to IRC 1091.

This guide is written for enrolled agents, CPAs, and tax attorneys who advise clients with securities trading accounts and digital asset portfolios. It covers the full IRC 1091 mechanics, the substantially identical standard, the basis and holding period consequences, Form 8949 reporting procedures, the digital asset exception under current law, the OBBBA 1099-DA reporting context, and planning considerations for year-end tax-loss harvesting. All statutory citations and IRS guidance must be verified against current IRS.gov resources before reliance in any specific client matter. This guide is for informational purposes only and does not constitute legal or tax advice.

Section 1: Overview of IRC 1091 -- How the Wash Sale Rule Works

The Basic Disallowance Rule

Under IRC 1091(a), a loss from the sale or other disposition of stock or securities is not allowed as a deduction if, within 30 days before or after the sale date, the taxpayer has:

• Acquired, or entered into a contract or option to acquire, substantially identical stock or securities; or
• Acquired substantially identical stock or securities in a fully taxable transaction.

The rule applies symmetrically to purchases made before the sale (the taxpayer already bought the replacement before selling the losing position) and to purchases made after the sale (the taxpayer sells the loser and quickly buys back). Both directions trigger the disallowance.

The statute says "30 days before or after," which creates a combined 61-day window: 30 days before the sale date, the sale date itself, and 30 days after the sale date. Any purchase of a substantially identical security anywhere inside that 61-day window triggers the rule.

The Per-Share Calculation

The wash sale rule operates on a per-share basis, not on the transaction as a whole. If a taxpayer sells 100 shares of a stock at a loss and buys back 60 shares within the window, 60% of the loss is disallowed (the portion matched by the repurchase) and 40% of the loss is allowed (the portion not matched). The 40 shares that were sold and not repurchased produce a recognized loss; the 60 shares that were sold and repurchased produce a deferred loss that is added to the basis of the 60 replacement shares.

Practitioners handling clients with large positions should track wash sales share by share, not position by position. A client who sells in multiple lots on different dates and repurchases on multiple dates may have a complex wash sale calculation that must be traced through each lot.

What IRC 1091 Covers

IRC 1091 applies to "stock or securities." For purposes of the wash sale rule, the term securities is generally understood to include stocks, bonds, debentures, notes, certificates, and other evidence of indebtedness, as well as rights to subscribe to or purchase any of the foregoing. The definition tracks the general federal tax law meaning of "securities" rather than the securities law definition under the Securities Exchange Act.

The critical boundary for the practitioner today is between securities (subject to IRC 1091) and property (not subject to IRC 1091). That boundary determines whether the wash sale rule applies to digital asset losses -- and is addressed in detail in Section 6 of this guide.

The wash sale rule does not apply to gains. A taxpayer who sells a security at a gain and repurchases within 30 days recognizes the gain in full; the repurchase is irrelevant for tax purposes. The rule exists specifically to prevent the artificial manufacture of tax losses through round-trip transactions in the same security.

Section 2: What Qualifies as "Substantially Identical"

The IRC 1091 wash sale rule turns on whether the security repurchased is the "same or substantially identical" to the security sold at a loss. The IRS has not issued a comprehensive, bright-line definition of "substantially identical." The determination is made on the facts and circumstances of each case. The following principles reflect IRS guidance and generally accepted practice, but practitioners should hedge any specific determination to current IRS guidance and the facts of the client's situation.

Same Stock, Same Class: Always Substantially Identical

Shares of stock of the same company in the same class are always substantially identical to themselves. A taxpayer who sells 100 shares of XYZ Corp common stock at a loss and buys 100 shares of XYZ Corp common stock within 30 days has a complete wash sale. There is no analysis required: same issuer, same class, same instrument.

Different classes of stock of the same company may or may not be substantially identical depending on how similar their economic rights are. Common stock and preferred stock of the same company are generally not substantially identical because their economic characteristics (voting rights, dividend preferences, liquidation priority) differ materially. However, two series of preferred stock with nearly identical economic terms could be substantially identical. These are fact-intensive determinations.

Merger Stock: Generally Not Substantially Identical After Closing

In a reorganization, a shareholder of the target company exchanges target stock for stock of the acquiring company. After the reorganization closes, the acquiring company's stock is generally not substantially identical to the original target stock, because the two instruments now represent ownership interests in different legal entities with different assets, liabilities, and economic profiles. A taxpayer who sells target stock at a loss (after the reorganization closes) and repurchases acquirer stock does not trigger a wash sale. However, if the reorganization has not yet closed and both instruments still represent essentially the same economic position, the analysis is more complex. Hedge any merger-related wash sale determination to the specific facts of the reorganization and current IRS guidance.

Options and Contracts

Under IRC 1091(a), the wash sale rule is triggered not only by the actual purchase of substantially identical stock or securities, but also by entering into a contract or option to acquire them. A taxpayer who sells stock at a loss and then buys a deep-in-the-money call option on the same stock within the 30-day window has triggered a wash sale -- even if the option has not yet been exercised and the underlying shares have not yet been received. The triggering event is the entry into the option or contract, not the subsequent acquisition of the shares.

Options to buy substantially identical stock trigger the rule; options to sell (put options) do not directly trigger the rule because buying a put is not acquiring the underlying stock. However, selling a put option on substantially identical stock shortly after a loss sale may constitute constructive acquisition under certain circumstances. The analysis of complex option strategies and their interaction with IRC 1091 is fact-specific; practitioners should review Rev. Rul. 85-87 and current IRS guidance for the applicable principle.

Mutual Funds and ETFs: Generally Not Substantially Identical

Shares of two different mutual funds or two different ETFs are generally not substantially identical to each other, even if they track the same market segment, because they are separate legal entities with different underlying portfolios, expense ratios, management structures, and portfolio compositions. A taxpayer who sells one S&P 500 index ETF at a loss and immediately buys a different S&P 500 index ETF has a strong argument that no wash sale occurred, because the two instruments are separate legal entities whose exact holdings may differ due to sampling methodology, reconstitution timing, and cash balances.

However, the IRS may take a narrower view where the two funds are tracking the exact same index with nearly identical portfolio compositions and the practical economic difference between them is negligible. Practitioners should also note that where there is only one practical fund or ETF option tracking a specific index -- meaning the taxpayer sells Fund A and immediately buys Fund A again under a different share class -- the risk of a substantially identical finding increases. The safest tax-loss harvesting strategy uses funds from different providers that track indexes with meaningfully different compositions. Document the economic differences between the sold and purchased funds in the client file.

Bonds: Same Issuer, Coupon, and Maturity

Bonds are substantially identical when they share the same issuer, the same coupon rate, and the same maturity date. A taxpayer who sells one Treasury bond and buys a different Treasury bond with a different coupon or a different maturity has not acquired a substantially identical security. Small differences in coupon or maturity date can be sufficient to establish that the bonds are not substantially identical, but the difference must be genuine and not de minimis. Practitioners handling fixed-income tax-loss harvesting should document the specific coupon and maturity of the sold bond and the replacement bond.

Related Party Attribution Under IRC 1091(e)

Under IRC 1091(e), purchases made by the taxpayer's spouse are attributed back to the taxpayer for wash sale purposes. If a taxpayer sells stock at a loss and the taxpayer's spouse purchases substantially identical stock within the 30-day window -- in any account, including a separate brokerage account, an IRA, or a joint account -- the wash sale rule is triggered. The two spouses are treated as a single taxpayer for purposes of the 61-day window analysis.

IRS guidance has also taken the position that purchases inside a taxpayer's individual retirement account (IRA) count as a replacement purchase that triggers the wash sale rule on a loss in the taxpayer's taxable account. This IRA wash sale issue is addressed in detail in Section 3 below. For entity attribution (controlled corporations, partnerships), practitioners should analyze the specific ownership and control facts; the "attributed back" position for entity purchases is the IRS view but specific attribution rules merit separate analysis in each case.

Section 3: The 30-Day Windows and the IRA Trap

The 61-Day Window

The IRC 1091 wash sale window extends 30 calendar days before the loss sale and 30 calendar days after the loss sale. Including the sale date itself, the total window is 61 days. The window is measured in calendar days, not trading days. Weekends and holidays count.

The window works in two directions:

• Pre-sale window (30 days before): A taxpayer who purchases a security on Day 0 and then sells the same security at a loss on Day 25 has a wash sale -- because the repurchase preceded the loss sale by fewer than 30 days. The IRS can disallow the Day 25 loss because the taxpayer already owned substantially identical stock within the 30-day pre-sale window.
• Post-sale window (30 days after): A taxpayer who sells a security at a loss and buys the same security back within 30 days of the sale triggers the classic wash sale. The repurchase must occur within 30 calendar days after the settlement date (or the trade date, depending on how the rule is applied in practice -- confirm with current IRS guidance and Publication 550).

The pre-sale window creates a less intuitive wash sale trap: a taxpayer can trigger a wash sale before it even knows it is going to sell at a loss. For example, a taxpayer who buys additional shares of a stock on November 1 and then decides to sell an older lot of the same stock at a loss on November 20 has a wash sale on the November 20 sale, because the November 1 purchase was within 30 days before the November 20 sale. This pre-sale trigger catches clients who "average down" into a losing position.

Year-End Timing: Sales in December

The year-end tax-loss harvesting window creates a concentration of wash sale risk. A client who sells a security at a loss on December 15 cannot repurchase the substantially identical security until January 15 of the following year (30 days after December 15). If the client repurchases on January 14, the December 15 loss is disallowed. The wash sale loss in this scenario crosses tax years: the loss was intended for the current-year return but the repurchase occurs in the following calendar year.

The same dynamic works in reverse: a client who purchased the security on December 3 and sold at a loss on December 20 has a wash sale -- because the December 3 purchase was within 30 days before the December 20 sale. Reviewing both the pre-sale and post-sale windows around December 31 is a mandatory step in year-end tax-loss harvesting review.

The IRA Wash Sale Trap

The IRA wash sale problem is one of the most practically significant and least understood traps in securities taxation. IRS guidance has taken the position that a purchase inside the taxpayer's IRA (traditional or Roth) within the 30-day window constitutes a replacement purchase that triggers the wash sale disallowance on the taxpayer's taxable account loss.

The problem is not merely that the loss is deferred: in the IRA wash sale scenario, the disallowed loss is permanently lost. Under IRC 1091(d), the disallowed loss is normally added to the basis of the replacement security. But a taxpayer cannot add basis to a security inside an IRA in this manner -- the IRA's cost basis is not adjusted for a disallowed wash sale loss from outside the IRA. The result is that the economic loss is gone: it cannot be recognized in the taxable account (because IRC 1091 disallows it) and it cannot be recovered through the IRA (because the IRA basis is not adjusted).

This trap is triggered most commonly when:

• A client has automatic dividend reinvestment (DRIP) set up inside an IRA that continuously purchases shares of a security the client is selling at a loss in a taxable account.
• A client rebalances an IRA by purchasing securities that match positions being harvested for losses in a taxable brokerage account.
• A client's spouse makes an IRA contribution and invests it in a security that the household is simultaneously selling at a loss in a taxable account.
• A robo-advisor or automated investment platform executes purchases across both a taxable account and an IRA without coordinating for wash sales.

Practitioners advising clients with both taxable and IRA accounts should treat the IRA as part of the wash sale analysis, not as a separate silo. The 30-day windows apply across the entire household's holdings, not just the taxable accounts.

Section 4: Basis Adjustment and Holding Period Extension

The Basis Adjustment Under IRC 1091(d)

When the IRC 1091 wash sale rule disallows a loss, the disallowed amount is not permanently forfeited (except in the IRA scenario discussed above). Under IRC 1091(d), the disallowed loss is added to the basis of the replacement security. The result is that the economic loss is preserved -- it will be recognized when the replacement security is eventually sold in a transaction that is not itself a wash sale.

The mechanics:

• The replacement security's basis equals its actual purchase price, increased by the disallowed wash sale loss from the sale of the original security.
• When the replacement security is eventually sold, the higher basis reduces the amount of gain recognized (or increases the loss recognized), effectively converting the deferred wash sale loss into a future gain reduction or loss increase.

Worked Example: Complete Wash Sale

The following example illustrates the basis adjustment mechanic for a complete wash sale:

In the example above, the original $4,000 loss was deferred, not permanently lost. When the replacement shares were sold for $8,000 against a $10,500 adjusted basis, the $2,500 loss was recognized. The deferred $4,000 loss absorbed the $1,500 economic gain built into the replacement shares (purchased at $6,500, sold at $8,000), and the net recognized loss of $2,500 reflects the underlying economics: the taxpayer bought at $100, the value dropped to $60, recovered to $80, and the cumulative economic loss over the entire holding period was $2,000 per share ($10,000 cost, $8,000 final proceeds). The wash sale rule deferred the timing but preserved the economics.

Holding Period Tacking Under IRC 1091(f)

In addition to the basis adjustment, IRC 1091(f) provides that the holding period of the original security (the one sold at a loss in the wash sale) is tacked onto the holding period of the replacement security. The replacement security is treated as if it was acquired on the same date as the original security, not on the actual date of the replacement purchase.

This holding period tacking matters for:

• Short-term vs. long-term capital gain characterization: If the original security was held for more than 12 months, the tacked holding period means the replacement security starts its life with the longer holding period already counted. A sale of the replacement security that would otherwise be a short-term sale may qualify as long-term because of the tacked period.
• AMT basis adjustments: For alternative minimum tax purposes, the basis of the replacement security reflects the AMT basis of the original security as adjusted for the disallowed AMT loss. Practitioners should track the AMT basis separately in cases where AMT is relevant.
• Qualified dividend holding period: The holding period requirements for qualified dividend income (IRC 1(h)(11)) are affected by any loss transactions in the 61-day window around the ex-dividend date; the wash sale holding period rules interact with the qualified dividend holding period rules for certain dividend-related loss harvesting strategies.

Section 5: Form 8949 Reporting for Wash Sales

The Line-by-Line Reporting Requirement

Wash sale losses are reported on Form 8949 (Sales and Other Dispositions of Capital Assets) on a transaction-by-transaction basis. Each loss transaction that involves a wash sale disallowance must be reported individually on Form 8949, not netted or summarized. The IRS requires a separate line for each wash sale transaction.

The Form 8949 reporting procedure for a wash sale loss:

• Column (a): Description of property sold (name of the security, number of shares or units).
• Column (b): Date acquired (use the original acquisition date; for tacked holding periods, the original date may be earlier than the replacement purchase date).
• Column (c): Date sold or disposed.
• Column (d): Proceeds (the actual sale price).
• Column (e): Cost or other basis (the actual purchase price of the lot sold, not the replacement lot's adjusted basis).
• Column (f) -- Code W: Enter the adjustment code "W" to indicate that this is a wash sale. This is the single most important field for signaling the wash sale to the IRS.
• Column (g): Enter the amount of the disallowed wash sale loss as a positive number. This is the dollar amount being added back (disallowed). The field is an adjustment, not the loss itself.
• Column (h): Gain or loss after adjustment. For a complete wash sale (100% of the loss disallowed), column (h) will show $0 -- the full loss in column (e) minus column (d) is offset by the positive adjustment in column (g). For a partial wash sale (where only a portion of the loss is disallowed), column (h) shows the allowed portion only.

Flow to Schedule D

The totals from Form 8949 flow to Schedule D. The wash sale adjustment in column (g) reduces the net loss on Schedule D. A taxpayer with $10,000 of capital losses from securities sales, of which $3,000 are disallowed wash sale losses, would report $10,000 of losses on Form 8949 but the $3,000 wash sale adjustment in column (g) would increase column (h) by $3,000, so that only $7,000 net loss flows to Schedule D. The Schedule D net capital gain or loss is then reported on the taxpayer's Form 1040.

Form 1099-B and Broker Reporting

Brokers report wash sales on Form 1099-B. Box 1g on Form 1099-B (Wash sale loss disallowed) shows the disallowed amount for wash sales the broker can identify within its own accounts. Box 1f (Accrued market discount) and box 1g both appear in the adjustments section of the 1099-B; practitioners should confirm they are using the correct box for the wash sale amount.

Critically, each broker only sees transactions within its own custody. A client who uses two different brokers to trade the same security will have wash sales that neither broker can identify or report. Broker A does not know that the client sold XYZ stock at a loss through Broker A and immediately repurchased XYZ through Broker B. Both brokers will report the transactions accurately from their own perspective, but neither will flag the cross-broker wash sale. The practitioner must identify cross-broker wash sales manually.

This same gap exists for cross-account wash sales involving the same broker (e.g., a taxable account and an IRA at the same brokerage) -- some brokers track cross-account wash sales within their platform, but this is not uniform, and practitioners should not assume the broker has caught all wash sales within its platform. Confirm with the specific broker.

Section 6: Digital Assets -- The Critical Exception Under Current Law

Digital Assets Are Property, Not Securities

Under current IRS guidance, digital assets -- including cryptocurrency, NFTs, and other digital assets as defined under OBBBA -- are treated as property for federal income tax purposes. The foundational authority is IRS Notice 2014-21, which established that cryptocurrency is property and not currency for federal tax purposes. Rev. Rul. 2023-14 extended IRS guidance to cryptocurrency staking rewards, treating them as gross income when received. Neither of these authorities treats digital assets as securities for purposes of IRC 1091.

Because IRC 1091 applies to losses from the sale of "stock or securities" -- not property -- the wash sale disallowance rule does not apply to losses from digital asset transactions under current law. A taxpayer may sell Bitcoin, Ethereum, or other cryptocurrency at a loss on one day and repurchase the identical cryptocurrency the next day, and the loss is allowed in full. The wash sale analysis that governs securities trading simply does not apply to digital asset round-trip transactions under current IRS guidance.

Under current IRS guidance and absent Congressional action, losses from sales of cryptocurrency and other digital assets are not subject to the wash sale disallowance of IRC 1091. Practitioners should monitor IRS guidance and legislative developments that could change this position.

The Planning Opportunity and the Documentation Obligation

The absence of the IRC 1091 wash sale constraint for digital assets creates a tax-loss harvesting opportunity that does not exist in the equity securities markets: a digital asset investor can sell a cryptocurrency position at a loss, immediately repurchase the same cryptocurrency, and recognize the loss for tax purposes while maintaining continuous economic exposure to the asset. This cannot be done with publicly traded stocks or bonds subject to IRC 1091 without waiting 31 days or substituting a different (non-substantially-identical) security.

This is a significant tax planning point, but it carries a documentation and compliance obligation. Practitioners should:

• Maintain written analysis in the client file establishing that the assets sold are digital assets treated as property under IRS Notice 2014-21 and subsequent guidance, and not securities subject to IRC 1091.
• Document the specific asset type and note the asset classification for any year in which significant cryptocurrency losses were harvested and positions were re-entered within 30 days.
• Note in the file that the position relies on current IRS guidance and could be affected by future legislation or regulatory changes.
• Confirm the digital asset classification on a year-by-year basis as IRS guidance continues to develop.

The documentation obligation exists precisely because the IRS's position on digital assets has evolved over time and Congress has repeatedly considered (and as of this writing has not yet enacted) legislation applying IRC 1091 to digital assets. A position that is defensible today may become contested by future guidance.

Section 7: When Digital Tokens Might Be Securities -- The Security Token Question

The analysis in Section 6 above addresses digital assets that are treated as property under IRS Notice 2014-21 -- the dominant category of cryptocurrency (Bitcoin, Ethereum, and most other tokens traded on digital asset exchanges). However, the digital asset ecosystem includes a category of tokens that may constitute "securities" under federal law: tokenized stocks, security tokens registered with the SEC, and digital instruments that represent debt, equity, or other securities interests in traditional legal form.

The Securities Definition for IRC 1091 Purposes

For IRC 1091 purposes, a security includes stock, bonds, debentures, notes, certificates, or other evidence of indebtedness, as well as rights to subscribe to or purchase any of the foregoing. A digital token that is structured as, or represents, stock in a company, a debt instrument of an issuer, or a right to acquire equity or debt is a security for IRC 1091 purposes based on its legal substance -- not based on the fact that it is issued and transferred on a blockchain.

Tokenized stocks (digital tokens that represent fractional or whole shares of publicly traded companies) are the clearest case: they represent an equity interest in a corporation and are therefore securities for federal tax purposes. A taxpayer who sells tokenized shares of a publicly traded company at a loss and repurchases the same (or substantially identical) tokenized shares within the 30-day window is subject to the IRC 1091 wash sale rule in the same manner as if the transaction were conducted in the traditional stock market.

The question of whether a specific digital token constitutes a security for IRC 1091 purposes requires a fact-specific analysis and may not have been definitively resolved by IRS guidance for all token types. Practitioners should consult current IRS guidance and applicable securities law analysis for any token that may be a registered security. The analysis looks through the form (a blockchain-based token) to the substance (what rights does the token represent) and asks whether those rights are the rights of a securities holder.

Practical Guidance for Practitioners

When a client holds digital tokens that are not conventional cryptocurrency (Bitcoin, Ethereum, and similar utility or currency-like tokens), practitioners should ask:

• Does the token represent an equity interest in an entity (stock)?
• Does the token represent a debt obligation of an issuer (bond, note, debenture)?
• Does the token carry a right to acquire stock, bonds, or other securities?
• Has the token been registered with the SEC as a security, or is the issuer subject to SEC reporting requirements based on the token?
• Has any IRS guidance specifically addressed the tax classification of this type of token?

If the answer to any of the first four questions is yes, the token is likely a security for IRC 1091 purposes, and the wash sale rule applies to loss sales of that token. Do not assume that every digital asset is exempt from IRC 1091; the exemption applies to digital assets treated as property, not to digital assets that are securities.

Section 8: OBBBA and Form 1099-DA -- The Reporting Infrastructure

What OBBBA Changed for Digital Asset Reporting

OBBBA significantly enhanced digital asset reporting requirements. Among the most consequential changes for practitioners is the Form 1099-DA requirement: OBBBA requires digital asset brokers to file Form 1099-DA for covered digital asset transactions, providing the IRS with transaction-level data including acquisition date, basis, proceeds, and asset type. This requirement is effective for transactions beginning in 2025, meaning the IRS now receives detailed data on digital asset trades in much the same way it receives Form 1099-B data on securities trades.

Before OBBBA's 1099-DA requirement, the IRS had limited visibility into the timing and volume of individual digital asset transactions. A taxpayer who sold cryptocurrency at a loss on December 31 and repurchased on January 2 generated no automatic IRS-visible record of those trades beyond any voluntary disclosure on the taxpayer's return. The 1099-DA requirement changes that: the IRS now receives a Form 1099-DA from the digital asset broker for both the December 31 sale and the January 2 repurchase, with dates, amounts, and asset identifiers.

What 1099-DA Visibility Means for Practitioners

The 1099-DA reporting infrastructure creates several practical implications:

• IRS visibility into wash-sale-like patterns: Even though IRC 1091 does not currently apply to cryptocurrency, the IRS can now identify transaction patterns that would constitute wash sales if the assets were securities. The IRS receives both the loss sale on Day 1 and the repurchase on Day 3 through the 1099-DA system, and can identify that pattern algorithmically. This creates audit exposure if the position that digital assets are not subject to IRC 1091 is ever challenged or if legislation is enacted and the IRS seeks to apply it retroactively or prospectively.
• Basis tracking: Form 1099-DA includes acquisition date and basis information. Practitioners now have an IRS-reported basis figure for digital asset transactions (subject to the same broker reporting limitations as Form 1099-B), which must be reconciled with the client's own records and any prior-year cost basis adjustments.
• Future legislative readiness: If Congress enacts legislation applying IRC 1091 to digital assets -- which has been proposed in multiple legislative sessions -- the 1099-DA data already exists to allow the IRS to identify non-compliant positions from 2025 forward. The reporting infrastructure is in place before the substantive rule may be enacted.
• Reconciliation burden: Practitioners must reconcile client-provided digital asset transaction records with the 1099-DA issued by the broker. Discrepancies in basis, dates, or proceeds will appear on the 1099-DA and will require explanation on the return. The reconciliation workflow for crypto transactions with 1099-DA is analogous to the 1099-B reconciliation workflow for securities.

What 1099-DA Does NOT Change

The 1099-DA reporting requirement does not change the substantive tax law. It does not make digital assets subject to IRC 1091. It does not create a new requirement to defer or disallow digital asset losses that would otherwise be recognized. The 1099-DA is a reporting mechanism, not a substantive rule change.

Practitioners should be precise in communicating this distinction to clients: the fact that the IRS now receives Form 1099-DA for their crypto trades does not mean that the wash sale rule now applies to those trades. The rule change that would matter for crypto wash sales is Congressional action amending IRC 1091 to include digital assets. That action had not been taken as of the date of this guide.

Section 9: Planning Considerations for Tax-Loss Harvesting

Coordinating Year-End Loss Harvesting with the 61-Day Window

The most common context in which practitioners encounter IRC 1091 is year-end tax-loss harvesting: clients sell securities positions that have declined in value to recognize capital losses that offset capital gains. The wash sale rule creates a 31-day waiting period before the same security can be repurchased (the 30-day post-sale window plus one day to be outside the window).

Practitioners coordinating year-end loss harvesting should:

• Review the pre-sale window before executing a loss sale. If the client purchased additional shares of the security within the 30 days before the planned sale date, those recent purchases may already have triggered a partial wash sale on the planned loss sale. Document the specific purchase dates and lot sizes.
• Ensure clients understand they cannot repurchase the same security for 31 days after the loss sale date if they want to preserve the recognized loss. The 31-day period begins on the day after the loss sale. Recommend a specific earliest repurchase date in writing to avoid inadvertent wash sales.
• Identify replacement securities that are not substantially identical to the sold security but provide comparable market exposure. For equity positions, a different company in the same sector, or an ETF with different composition, can maintain market exposure during the 31-day window without triggering the wash sale rule. Document the economic differences between the sold security and the replacement.
• Review all accounts for automated activity during the window: check for scheduled dividend reinvestment, systematic investment plans, or employer stock purchase plan (ESPP) purchases that could create inadvertent wash sales during the 31-day period.
• For losses harvested late in December (after December 1), note that the 31-day window extends into January of the following year. The client must not repurchase the security in the new year until the window closes, even though the sale was in the prior year.

Account Coordination Across All Accounts

The wash sale analysis must cover all accounts in the household, not just the account where the loss sale occurred. This includes:

• All taxable brokerage accounts of the taxpayer, at all brokers.
• All IRA accounts of the taxpayer (traditional, Roth, SEP, SIMPLE -- all account types).
• All brokerage and IRA accounts of the taxpayer's spouse, including separate accounts in the spouse's individual name.
• Any accounts of entities the taxpayer controls that may purchase substantially identical securities (this is a facts-and-circumstances determination; hedge to current IRS guidance).
• Any employer-sponsored retirement accounts (401(k), 403(b)) if the taxpayer or employer is purchasing substantially identical securities through the plan during the wash sale window -- though this is less common because plan purchases are typically directed to diversified funds, not individual securities the taxpayer is harvesting at the taxable account level.

Digital Asset Tax-Loss Harvesting: Current Opportunity

Under current law, the absence of IRC 1091 for digital assets means that digital asset tax-loss harvesting is substantially more flexible than securities tax-loss harvesting. A client who holds Bitcoin at a loss can sell and immediately repurchase, recognizing the loss while maintaining full economic exposure. This is a legitimate tax planning strategy under current IRS guidance.

However, practitioners should counsel clients that:

• The position rests on current law only. If Congress enacts legislation applying IRC 1091 to digital assets, the wash sale rule could apply prospectively from the date of enactment. The strategy may not be available in future tax years.
• Software may misreport. Many cryptocurrency tax platforms (including CoinTracker, Koinly, TaxBit, and similar tools) do not apply wash sale rules to crypto because the rule does not currently apply. Practitioners should not expect third-party crypto tax software to flag digital asset "wash sales." The software's correct behavior (not applying the rule) could mislead preparers who are less familiar with the digital asset exception.
• Documentation is mandatory. Maintain written analysis that digital assets are property, not securities, for any year in which significant cryptocurrency losses were harvested and positions were re-entered within 30 days. This documentation is the first line of defense under examination.
• 1099-DA creates an IRS-visible record. The OBBBA 1099-DA reporting requirement means the IRS now receives transaction-level data on digital asset trades. Positions must be correctly reported on Form 8949 with accurate basis, proceeds, and gain/loss amounts. The wash sale code W should not be used for digital asset transactions under current law (because the wash sale rule does not apply), but the transactions must still be reported accurately and completely.

Monitoring the Legislative Landscape

Congress has included provisions applying IRC 1091 to digital assets in multiple legislative proposals over the past several years. As of July 2026, no such provision has been enacted. But the legislative history demonstrates clear Congressional awareness of the digital asset wash sale exception as a revenue issue, and future legislation remains a genuine risk.

Practitioners should include a standing note in client files for active digital asset traders that the wash sale exception for digital assets is a current-law planning opportunity that is subject to legislative change. Year-end planning sessions for clients with significant cryptocurrency positions should include a check on whether any legislation applying IRC 1091 to digital assets has been enacted or is pending, because an effective date tied to a bill's enactment could make a year-end loss harvest either available or not depending on Congressional timing.

Frequently Asked Questions

Common questions from enrolled agents, CPAs, and tax attorneys on the IRC 1091 wash sale rule and digital assets.

Tax Software for Complex Capital Gains and Digital Asset Returns

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