IRC 2040 governs the gross estate inclusion of jointly held property -- specifically, property held as joint tenancy with right of survivorship (JTWROS) and tenancy by the entirety. The section creates two distinct inclusion regimes: the full-inclusion contribution-and-tracing rule for non-spousal joint tenancies under IRC 2040(a), and the automatic 50% rule for qualified joint interests between spouses under IRC 2040(b). The asymmetry between these two regimes is the most consistently missed audit trap in estate tax practice and, after the OBBBA's permanent $15 million exemption, the most valuable basis step-up planning lever available to high-net-worth clients whose estates fall well below the exemption threshold.
This guide covers every IRC 2040 provision a practitioner needs to advise clients on titling strategies, prepare Form 706 Schedule E, and structure basis step-up planning for appreciated jointly held property. It also addresses the interaction of IRC 2040 with IRC 2033 (tenancy in common), IRC 2035 (transfers within three years of death), and IRC 1014(b)(9) vs. IRC 1014(b)(6) for community property. All statutory references should be verified at IRS.gov; consult qualified counsel before implementing any titling strategy.
Under IRC 2040(a), the ENTIRE fair market value of non-spousal jointly held property is includible in the decedent's gross estate unless the surviving co-tenant can prove, with documentary evidence, the portion attributable to the survivor's original contribution. Verbal testimony about who paid what is routinely discounted or rejected at IRS examination. If the surviving tenant has no documentation tracing the source of funds used to acquire the property, the estate faces 100% inclusion regardless of the parties' intent. Practitioners advising clients at the time of acquisition should recommend maintaining a contemporaneous, written record of each party's contribution and retaining those source documents indefinitely. Verify at IRS.gov.
The Statutory Framework: IRC 2040(a) and IRC 2040(b)
IRC 2040(a) states the general rule: in the case of property held jointly at the time of the decedent's death by the decedent and any other person, except in the case of a qualified joint interest (addressed separately), the value of the entire jointly held property is included in the decedent's gross estate, except such part of the full value as may be shown to have originally been received or acquired by the other joint owner as consideration furnished by the other joint owner for the property. The burden of proof falls on the surviving joint tenant, not on the IRS or the estate.
IRC 2040(b) provides the spousal exception. In the case of a qualified joint interest -- property held by the decedent and the decedent's spouse as joint tenants with right of survivorship, tenants by the entirety, or joint tenants if the decedent and the spouse were the only joint tenants -- only 50% of the value of the jointly held property is includible in the decedent's gross estate, regardless of which spouse furnished the consideration. No contribution tracing is required; no evidentiary showing is necessary. The 50% inclusion is automatic and mandatory.
The Purchase-with-Consideration Exception Under IRC 2040(a)
The contribution rule under IRC 2040(a) does not simply measure ownership fraction. It requires tracing the consideration used to acquire the property back to funds originally owned by the surviving joint tenant, independently of the decedent. The surviving joint tenant's provable contribution amount is subtracted from the full fair market value of the property, and only the remainder is included in the decedent's gross estate. Under Treas. Reg. 20.2040-1, the following principles govern the tracing:
- The surviving joint tenant must trace original consideration to the date of acquisition of the property (not to post-acquisition payments).
- The critical evidence is the source of the down payment and purchase funds: bank records, wire transfer confirmations, brokerage account statements, and loan documents showing the origin of funds.
- Post-acquisition mortgage payments, improvement costs, and carrying costs generally do not establish contribution to the original consideration that reduces the includible amount under IRC 2040(a).
- If the decedent gifted funds to the surviving tenant, and the surviving tenant then contributed those gifted funds toward the purchase, the contribution is treated as originating with the decedent and does not reduce the includible amount.
- If both parties contributed, the includible fraction equals the total value multiplied by the decedent's contribution fraction (1 minus the survivor's proven fraction).
The surviving joint tenant must trace original consideration to the date of acquisition -- not to later payments. Post-acquisition mortgage payments, improvements, and carrying costs generally do not help establish the contribution fraction under Treas. Reg. 20.2040-1. The source of the initial down payment and purchase funds is the critical evidence at IRS examination. Where the decedent was the primary earner during the marriage and property was purchased with funds deposited into a joint account, the survivor's tracing position may be difficult to sustain because those joint funds may be deemed to have originated with the decedent. Practitioners should advise clients to maintain contemporaneous documentation at the time of acquisition and retain it indefinitely. Verify at IRS.gov.
Qualified Joint Interests: The Spousal 50% Rule Under IRC 2040(b)
IRC 2040(b) eliminates the evidentiary burden for married couples by mandating a 50% inclusion result regardless of contribution. The rule applies to property held as JTWROS or tenancy by the entirety where the only joint tenants are the decedent and the decedent's spouse. The 50% outcome is the same whether the decedent funded the entire purchase price or the surviving spouse did.
The mechanical simplicity of IRC 2040(b) is both its value and its limitation. It eliminates the Form 706 audit risk that attaches to contribution tracing, and it prevents the estate from being surprised by 100% inclusion. But it caps the basis step-up at 50% of the property value under IRC 1014(b)(9). For married couples whose combined estate is well below the OBBBA $15 million exemption, this 50% cap may represent a significant missed planning opportunity -- particularly for properties with large built-in capital gains.
Under IRC 2040(b), spousal JTWROS produces exactly 50% gross estate inclusion, and therefore only 50% of the property receives a stepped-up basis under IRC 1014(b)(9). For a married couple with a combined estate well below the $15 million OBBBA exemption, this forfeits the full basis step-up on the other 50% at zero benefit -- no estate tax was being avoided by the 50% cap. Community property titling (where available under state law) captures a full basis step-up on both halves under IRC 1014(b)(6) at zero additional estate tax cost. In common-law states without community property, a testamentary transfer of the surviving spouse's interest through a bypass trust or other structure may provide an alternative path to maximizing basis. Consult qualified counsel on the titling mechanics before restructuring. Verify at IRS.gov.
Tenancy by the Entirety: JTWROS for Federal Estate Tax Purposes
Tenancy by the entirety is a form of marital co-ownership recognized in approximately half of U.S. states. It is available only to married couples and provides automatic right of survivorship as well as protection from the separate creditors of either spouse in most jurisdictions that recognize it.
Spouses who hold property as tenancy by the entirety -- a form recognized in roughly half of U.S. states -- are treated as holding a qualified joint interest under IRC 2040(b) for federal estate tax purposes. The automatic 50% inclusion rule applies regardless of which spouse paid for the property, and no contribution tracing is required. The state-law creditor-protection advantages of tenancy by the entirety are independent of the federal estate tax result; the titling form affects both simultaneously. Practitioners should confirm whether the applicable state recognizes tenancy by the entirety for the type of property in question (some states limit it to real property). Verify at IRS.gov and consult qualified counsel.
The IRC 2033 vs. IRC 2040 Distinction: Tenancy in Common and JTWROS
Tenancy in common (TIC) ownership is governed by IRC 2033: only the decedent's fractional share of the TIC interest is includible in the gross estate, at its date-of-death fair market value. JTWROS is governed by IRC 2040: the contribution rule (non-spousal) or the 50% rule (spousal) applies rather than a simple fractional-share computation. Misclassifying a TIC as JTWROS on Form 706 Schedule E Part 2 produces a different -- often larger or smaller -- inclusion amount and a different basis step-up result. Practitioners must review the deed or instrument of ownership before completing Schedule E to confirm the legal form of co-ownership. Verify at IRS.gov.
The structural difference between TIC and JTWROS has planning consequences beyond the gross estate computation. A TIC interest is a probate asset that passes under the decedent's will, permitting testamentary flexibility: a bypass trust, a credit shelter trust, or a specific bequest to a named beneficiary. JTWROS property passes by operation of law to the surviving joint tenant, overriding the will entirely. This survivorship override makes JTWROS a planning constraint in estate structures that rely on testamentary allocation. For more on how these ownership forms feed into the overall gross estate calculation, see IRC 2031 and 2032 gross estate valuation and Form 706.
Form 706 Schedule E Reporting for IRC 2040 Property
Form 706 Schedule E is the reporting vehicle for all jointly owned property. It is divided into two parts:
- Part 1: Tenancy-in-common interests governed by IRC 2033. Report the decedent's fractional interest in the property at its date-of-death fair market value.
- Part 2: JTWROS and tenancy-by-the-entirety interests governed by IRC 2040. Report the full fair market value of the property, then reduce by the proven contribution amount (non-spousal) or report 50% of the full value (spousal) as the includible amount.
For each property reported on Schedule E Part 2, the estate must provide: a description of the property; the name(s) and relationship of the surviving joint tenant(s); the total date-of-death fair market value; the contribution amount attributable to the surviving tenant (if non-spousal and contribution is claimed); and the includible amount. Supporting documentation for contribution amounts -- including the source-of-funds evidence required under Treas. Reg. 20.2040-1 -- should be maintained and made available for IRS examination. For more on Form 706 filing mechanics and portability elections, see Form 706 estate tax return and portability election.
Verify current Schedule E instructions at IRS.gov before filing, as the IRS updates Form 706 instructions periodically and the applicable instructions for the decedent's year of death control.
IRC 1014(b)(9) Basis Step-Up for Jointly Held Property
IRC 1014(b)(9) provides that property acquired from a decedent which is includible in the gross estate under IRC 2040 receives a basis equal to the date-of-death fair market value, but only to the extent the property was included in the decedent's gross estate. The step-up is proportional to the inclusion:
- Non-spousal JTWROS, survivor proves no contribution: 100% of the property is included in the gross estate; 100% of the property receives a full basis step-up to date-of-death FMV.
- Non-spousal JTWROS, survivor proves 30% contribution: 70% of the property is included in the gross estate; 70% of the property receives a basis step-up; the survivor's 30% retains its prior basis.
- Spousal JTWROS under IRC 2040(b): 50% of the property is included; 50% receives a basis step-up to date-of-death FMV; the surviving spouse's 50% does not receive a step-up under IRC 1014(b)(9).
This contrasts sharply with community property under IRC 1014(b)(6), which steps up the basis of BOTH halves of community property (including the surviving spouse's half) if at least half was includible in the gross estate -- even though only half was subject to estate tax. The community property rule is one of the most powerful basis planning tools available and is a significant reason clients in common-law states sometimes consider migrating assets to community property trust structures. For a full analysis of stepped-up and carryover basis rules, see IRC 1014 and 1015 stepped-up and carryover basis rules.
With the OBBBA permanently setting the IRC 2010 basic exclusion at $15 million per person (indexed; verify at IRS.gov), a married couple can shelter up to $30 million from federal estate tax using portability. For estates well below that threshold, practitioners can now consider titling appreciated property as non-spousal JTWROS, positioning 100% of the property for inclusion in the first spouse's gross estate under IRC 2040(a) -- producing a full IRC 1014(b)(9) basis step-up on ALL of the property at zero estate tax cost when the gross estate stays below $15 million. The mechanics require confirming that the decedent spouse funded substantially all of the original consideration (or that the survivor's contribution can be traced to zero), and that the titling does not inadvertently create a spousal qualified joint interest. Consult qualified counsel on the titling mechanics before restructuring; the specific deed form and state-law requirements vary. Verify at IRS.gov. Note that OBBBA guidance may still be developing.
OBBBA $15 Million Exemption and Jointly Held Property Titling Strategy
The One Big Beautiful Budget Act made the increased estate and gift tax basic exclusion amount permanent at $15 million per person (indexed for inflation), effective for decedents dying after December 31, 2025. With portability, a married couple can effectively shelter up to $30 million. The practical consequence for jointly held property planning is a near-complete inversion of pre-OBBBA titling incentives for clients well below the exemption threshold.
Before the OBBBA, estates near the prior $11-$13 million per-person exemption range faced a real tradeoff: higher gross estate inclusion meant higher estate tax liability. Minimizing 2040(a) inclusion by proving survivor contribution -- or restructuring to spousal JTWROS -- was often rational to manage estate tax. After the OBBBA, for clients whose combined estate will remain below $30 million, there is no estate tax to manage: the question is purely which titling structure produces the largest basis step-up. The answer, in the right fact pattern, is non-spousal JTWROS with 100% inclusion under IRC 2040(a).
For a detailed analysis of the OBBBA exemption and portability mechanics, see IRC 2010 OBBBA permanent $15 million estate tax exemption. For the gift tax mechanics that may be implicated in restructuring joint tenancy titling, see IRC 2501 through 2505 federal gift tax and the unified credit.
Interaction with IRC 2035: Transfers of Joint Interests Within Three Years of Death
If a joint tenant converts JTWROS to TIC within three years of death (releasing the survivorship feature), or transfers their JTWROS interest outright within three years, IRC 2035 may pull the transferred interest back into the gross estate. This three-year lookback is a standard audit scrutiny window for pre-death changes in the form of joint ownership. The most common IRC 2035 trigger in the JTWROS context is a conversion of JTWROS to TIC combined with a testamentary transfer -- a structure sometimes used to restore testamentary flexibility -- executed close in time to death.
Practitioners should review all changes in the form of joint ownership made in the three years before death and assess whether IRC 2035 applies. The IRS routinely examines titling changes in that window. Note also that IRC 2035 does not apply to property subject to IRC 2040 in all situations; the analysis is fact-specific. Verify at IRS.gov and consult qualified counsel.
Joint Ownership Estate Inclusion Comparison Table
The following table summarizes the estate inclusion treatment, basis step-up result, contribution tracing requirement, and Form 706 schedule for the principal forms of jointly or co-owned property a practitioner is likely to encounter.
| Ownership Form | IRC Section | Inclusion Amount | Basis Step-Up Under IRC 1014 | Contribution Tracing Required | Form 706 Schedule |
|---|---|---|---|---|---|
| Non-Spousal JTWROS (general rule) | 2040(a) | 100% of FMV (less proven survivor contribution) | IRC 1014(b)(9): step-up proportional to included amount | Yes -- survivor must prove contribution from own funds | Schedule E, Part 2 |
| Non-Spousal JTWROS (survivor proves full contribution) | 2040(a) | 0% (fully excluded if survivor proves 100% contribution) | No step-up; survivor retains prior basis | Yes -- survivor must trace 100% contribution | Schedule E, Part 2 |
| Spousal JTWROS (qualified joint interest) | 2040(b) | 50% of FMV (automatic, regardless of contribution) | IRC 1014(b)(9): step-up on included 50% only | No | Schedule E, Part 2 |
| Tenancy by the Entirety (spouses) | 2040(b) | 50% of FMV (treated as qualified joint interest) | IRC 1014(b)(9): step-up on included 50% only | No | Schedule E, Part 2 |
| Tenancy in Common (decedent's fractional share) | 2033 | Decedent's fractional ownership share at FMV | IRC 1014(a): full step-up on decedent's included share | No | Schedule E, Part 1 |
| Community Property (decedent's half) | 2033 + 1014(b)(6) | 50% of community property FMV | IRC 1014(b)(6): BOTH halves step up (decedent's and survivor's) | No | Schedule F or E, Part 1 |
| Joint Bank Account (JTWROS, non-spousal) | 2040(a) | 100% of balance (less survivor's proven deposits) | IRC 1014(b)(9): step-up on included amount | Yes -- survivor must trace own deposits | Schedule E, Part 2 |
| Joint Brokerage Account (non-spousal JTWROS) | 2040(a) | 100% of FMV (less survivor's proven contribution) | IRC 1014(b)(9): step-up on included amount | Yes -- contribution rule applies to securities accounts | Schedule E, Part 2 |
| Revocable Trust Holding (grantor as joint tenant) | 2036 / 2038 (primary); 2040 secondary | Full value (retained interest / power to revoke) | IRC 1014(b)(2): full step-up for property in revocable trust | No (2036/2038 analysis controls) | Schedule G |
| JTWROS Real Property Pre-2040(b) (non-spousal) | 2040(a) | 100% of FMV less proven survivor contribution | IRC 1014(b)(9): step-up proportional to included amount | Yes | Schedule E, Part 2 |
| Surviving Spouse's Separate Property | N/A (not in decedent's estate) | 0% (not includible in decedent's gross estate) | No step-up at first death | N/A | Not reported |
| JTWROS Transferred Within 3 Years of Death | 2035 (potential pull-back) | Depends on nature of transfer and IRC 2035 analysis | IRC 1014: follows gross estate inclusion amount | Fact-specific (2035 analysis required) | Schedule G (if 2035 applies) |
Frequently Asked Questions: IRC 2040 Jointly Held Property
How does IRC 2040(a) differ from IRC 2040(b) for jointly held property?
IRC 2040(a) is the general rule for non-spousal JTWROS: the full fair market value of the jointly held property is includible in the decedent's gross estate unless the surviving joint tenant can prove, with documentary evidence, the portion attributable to the survivor's original contribution. The burden falls on the surviving tenant. IRC 2040(b) is the qualified joint interest rule for spousal JTWROS and tenancy by the entirety: exactly 50% of the fair market value is includible regardless of who furnished the consideration, with no evidentiary burden.
The 2040(a)/(b) asymmetry drives both the estate tax liability and the IRC 1014(b)(9) basis step-up: more inclusion means a larger step-up (at the cost of a larger gross estate), while the 2040(b) 50% cap prevents both a larger estate and a larger step-up simultaneously. For estates well below the OBBBA $15 million exemption, more inclusion is often the better basis planning outcome. Verify at IRS.gov.
What is the contribution rule and what evidence is required to satisfy it?
The contribution rule under IRC 2040(a) requires the surviving joint tenant to trace the original consideration for the acquisition of the property to funds the survivor owned independently of the decedent at the time of acquisition. The tracing runs to the date of acquisition, not to post-acquisition payments. Bank records, wire transfer confirmations, brokerage statements, and loan documents showing the source of the down payment and purchase funds are the critical categories of evidence. Verbal testimony is generally insufficient without corroborating documents.
Post-acquisition mortgage payments, improvement costs, and carrying costs generally do not establish the survivor's contribution to the original consideration under Treas. Reg. 20.2040-1. If the decedent gifted funds to the survivor that the survivor then used to purchase the property, those funds trace back to the decedent and do not reduce the includible amount. Practitioners should advise clients to maintain contemporaneous written records and retain source documents at the time of acquisition. Verify at IRS.gov.
How does tenancy by the entirety fit within IRC 2040, and which states recognize it?
Tenancy by the entirety is treated as a qualified joint interest under IRC 2040(b) for federal estate tax purposes. The automatic 50% inclusion rule applies: exactly half of the date-of-death fair market value is includible in the decedent's gross estate regardless of which spouse contributed the purchase price. No contribution tracing is required.
Approximately half of U.S. states recognize tenancy by the entirety, and some limit it to real property while others extend it to personal property. State law governs the availability and characteristics (including creditor protection). The federal estate tax result -- 50% inclusion under IRC 2040(b) -- follows from the ownership form rather than the state-law label, as long as it qualifies as a spousal joint interest with right of survivorship. Confirm state law before advising on tenancy-by-the-entirety titling. Verify at IRS.gov.
What does Form 706 Schedule E require for jointly held property, and what are the most common errors?
Form 706 Schedule E Part 2 is used to report JTWROS and tenancy-by-the-entirety property governed by IRC 2040. The estate must list the property description, the surviving joint tenants, the date-of-death fair market value, the survivor's proven contribution (if any, for non-spousal JTWROS), and the includible amount. Part 1 covers tenancy-in-common property under IRC 2033.
The most common errors are: (1) reporting non-spousal JTWROS at 50% by misapplying the spousal rule; (2) reporting TIC property on Part 2 instead of Part 1; (3) overstating the survivor's contribution without adequate documentary support; and (4) failing to attach supporting documentation for contribution amounts. Each error produces an incorrect gross estate figure and an incorrect basis step-up. Verify current Form 706 instructions at IRS.gov before filing, as the IRS updates instructions periodically.
What is the basis step-up under IRC 1014(b)(9) for non-spousal JTWROS vs. IRC 1014(b)(6) for community property?
Under IRC 1014(b)(9), property includible in the gross estate under IRC 2040 receives a basis equal to its date-of-death fair market value, but only in proportion to the amount included. Non-spousal JTWROS with 100% inclusion gets a full step-up on all of the property; spousal JTWROS with 50% inclusion gets a step-up on only 50% of the property. The surviving spouse's half in a spousal JTWROS does not receive a basis step-up under IRC 1014(b)(9).
Community property under IRC 1014(b)(6) is treated differently: both halves of community property receive a stepped-up basis to date-of-death fair market value if at least half was includible in the decedent's gross estate -- including the surviving spouse's half that was NOT in the estate. This bilateral step-up is the community property basis advantage. For clients in common-law states with highly appreciated assets, the difference between community property and spousal JTWROS can translate into a significant income tax benefit for the surviving spouse on a future sale. See IRC 1014 and 1015 stepped-up and carryover basis rules for the full analysis. Verify at IRS.gov.
How does the OBBBA $15 million exemption change jointly held property titling strategy?
The OBBBA permanently set the IRC 2010 basic exclusion at $15 million per person (indexed for inflation; verify current figure at IRS.gov), giving a married couple up to $30 million of combined shelter using portability. For clients whose combined gross estate is well below $15 million, there is no federal estate tax to reduce -- the only question is which titling structure maximizes the IRC 1014 basis step-up.
In that fact pattern, non-spousal JTWROS with 100% inclusion under IRC 2040(a) -- where the decedent funded substantially all of the original consideration -- produces a full basis step-up on the entire property at zero estate tax cost. Before the OBBBA, this full-inclusion outcome had a direct estate tax cost; after the OBBBA, for estates well below the exemption, it has none. Practitioners who previously advised married clients to use spousal JTWROS to limit inclusion should revisit those strategies for clients with appreciated assets and total estates well below $15 million. Consult qualified counsel on titling mechanics; OBBBA guidance may still be developing. Verify at IRS.gov.
What happens if the surviving joint tenant cannot prove contribution, and does a revocable trust change the analysis?
If the surviving joint tenant cannot prove any contribution to the original consideration, 100% of the jointly held property's fair market value is includible in the decedent's gross estate under IRC 2040(a). For estates below the OBBBA exemption, this 100% inclusion is not a tax harm -- it produces a full IRC 1014(b)(9) basis step-up on the entire property at zero estate tax cost. The harm comes when the estate reported less than 100% inclusion (by claiming a contribution the survivor cannot substantiate), and the IRS challenges the position at audit, expanding the gross estate.
A revocable trust holding does not change the IRC 2040 analysis if the trust holds the property as a joint tenant. However, if the decedent transferred property to a revocable trust before death, and the surviving spouse is not a joint tenant but is a beneficiary of the trust, the property is includible under IRC 2036 or 2038 (retained interest) rather than IRC 2040, and the IRC 1014(b)(2) basis step-up provision for revocable trust property applies instead. Verify at IRS.gov and consult qualified counsel.
What is the practical planning difference between JTWROS and TIC for estate planning after the OBBBA?
Joint tenancy with right of survivorship passes property automatically to the surviving joint tenant by operation of law, overriding the will. This eliminates probate for that asset but also eliminates testamentary flexibility: the decedent cannot redirect the JTWROS property to a bypass trust, a charitable remainder trust, or any other testamentary structure through the will. For estates that do not need testamentary flexibility (because the couple's primary goal is a clean transfer to the surviving spouse with a maximum basis step-up), JTWROS can be efficient. For estates that want to allocate assets among multiple beneficiaries or fund a bypass trust at the first death, JTWROS is a structural constraint.
Tenancy in common restores testamentary flexibility: the decedent's TIC share passes through probate under the will. However, TIC shares are includible under IRC 2033 at the fractional ownership amount rather than under the IRC 2040 contribution or spousal rules, and fractional interest discounts may reduce both the gross estate and the basis step-up. For clients who want to maximize basis step-up and maintain testamentary flexibility, a TIC with a testamentary bequest of the decedent's share to the surviving spouse (triggering the marital deduction and basis step-up) may be preferable to JTWROS. Each structure has different probate, creditor-protection, and state-law characteristics. Consult qualified counsel before selecting an ownership form. Verify at IRS.gov.
Advising Clients on Jointly Held Property Under IRC 2040?
Americas Tax works with estate attorneys, CPAs, and enrolled agents on Form 706 preparation, basis step-up planning, and JTWROS titling strategy after the OBBBA. Contact our team to discuss your client's situation.
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