Section 199A QBI Deduction: OBBBA 2026 Practitioner Guide

The One Big Beautiful Budget Act (OBBBA) permanently extended Section 199A and added five structural changes that alter the practitioner workflow for every pass-through return. The deduction is no longer temporary planning subject to a sunset; it is permanent law, recently enacted, and requires updated procedures for every S-corp, partnership, and Schedule C return that has qualified business income. The five changes are not cosmetic: they affect threshold calculations, minimum deduction mechanics, the sequencing of related deductions, and the interaction with itemized deduction limitations. Practitioners who carried forward prior-law Section 199A workflows without updating them for OBBBA will produce incorrect results on a predictable set of returns. Verify all OBBBA provisions at IRS.gov; recently enacted. For the new above-the-line deductions for tips, overtime, and the senior bonus under OBBBA, see our Schedule 1-A practitioner guide.

The 2026 filing season revealed that the QBI and bonus depreciation sequencing problem was the most widespread calculation error of the season. OBBBA also restored 100% bonus depreciation, and many software workflows did not enforce the correct order of operations when both deductions were present on the same return. The result was an overstated QBI figure and an overstated Section 199A deduction on capital-intensive S-corps and partnerships that took large bonus depreciation elections. This guide covers all five OBBBA structural changes and walks through the correct sequencing, the three-part deduction calculation, the S-corp reasonable compensation interaction, the aggregation election, and the practitioner checklist. All dollar thresholds and phase-in ranges: verify current figures at IRS.gov; subject to annual inflation adjustment per Rev. Proc. 2025-32. For the OBBBA above-the-line deductions reported on Schedule 1-A (qualified tips, overtime, car loan interest, and the senior deduction), see the companion Schedule 1-A OBBBA Deductions Practitioner Guide.

Partnership clients with QBI component allocation errors on their K-1s require a separate corrective workflow; see our K-1 Allocation Errors: BBA vs. Non-BBA Amendment Guide for the BBA and non-BBA correction paths.

All dollar amounts, thresholds, and statutory citations in this guide must be verified at IRS.gov before use in client engagements. OBBBA provisions are recently enacted; final regulations and form instructions govern. This guide is informational and does not constitute legal or tax advice.

Five Structural Changes Under OBBBA

The OBBBA made five changes to Section 199A that affect workflow and calculation for every pass-through return. Each change is described below with the applicable hedge requirement. Verify all at IRS.gov; recently enacted.

1. Permanent status: no sunset

Under prior law, the Section 199A deduction was scheduled to expire on December 31, 2025. The OBBBA permanently extended Section 199A, removing the sunset. For returns filed for tax year 2026 and later, there is no expiration date built into the statutory text. Planning strategies that were limited by the sunset (multi-year income shifting, entity structure decisions timed around the expiration) should be re-evaluated with permanent status in mind. Verify the current status of Section 199A at IRS.gov; any future legislative change could modify this.

2. Expanded phase-in range: 2026 thresholds from Rev. Proc. 2025-32

The OBBBA expanded the income range over which the W-2 wage and UBIA limitation phases in. Under OBBBA, for 2026, the phase-in range begins at $201,750 for single filers and $403,500 for married filing jointly taxpayers per Rev. Proc. 2025-32. These are the thresholds above which the W-2 and UBIA limitation begins to phase in. Verify current thresholds at IRS.gov; subject to annual inflation adjustment. The expanded range means more taxpayers are now in a partial-limitation zone rather than being fully above or fully below the phase-in threshold. This increases the frequency with which practitioners must apply the interpolation calculation rather than using the simpler below-threshold formula.

3. $400 minimum QBI deduction

For tax years beginning in 2026, a taxpayer with $1,000 or more of qualified business income (aggregate, across all qualifying businesses) is entitled to a minimum Section 199A deduction of $400, regardless of the W-2 wage and UBIA limitation that would otherwise apply. The minimum does not apply if aggregate net QBI is below $1,000 or is negative. Both the $400 minimum and the $1,000 QBI threshold are indexed for inflation for tax years beginning after 2026. These are 2026 figures; verify annual adjustments at IRS.gov; recently enacted per OBBBA. The minimum is a floor on the deduction, not an addition to it: if the regular calculation produces a deduction greater than $400, the regular calculation controls.

4. Section 68 interaction: itemized deduction limitation

The OBBBA reinstated the overall limitation on itemized deductions under IRC Section 68 (the "Pease limitation"). For Section 199A purposes, the OBBBA provided that the Section 199A deduction is excluded from the taxable income calculation base used for Section 68 purposes. In practical terms, this means the Section 199A deduction is not reduced by the Section 68 limitation, and the Section 68 calculation is performed without including the Section 199A deduction in the taxable income base against which the limitation is computed. Verify the precise mechanics of the Section 68 exclusion at IRS.gov and in the applicable instructions; this interaction has planning implications for high-income taxpayers who itemize and have significant QBI.

5. SSTB phase-out band expansion

The OBBBA expanded the phase-in band for specified service trades or businesses (SSTBs). Under prior law, SSTB income phased out of the QBI deduction over a relatively narrow income range above the applicable threshold. The expanded band means SSTB-derived QBI phases out over a wider range, which can produce a partial deduction for SSTB income at income levels that would have received no deduction under prior law. The exact phase-in range for SSTBs in 2026: verify current figures at IRS.gov and Rev. Proc. 2025-32; subject to annual inflation adjustment and recently enacted per OBBBA.

The QBI and Bonus Depreciation Sequencing Problem

The OBBBA restored 100% bonus depreciation effective for qualifying property placed in service after the applicable date (verify current effective dates at IRS.gov; recently enacted). For capital-intensive S-corps and partnerships, a large bonus depreciation election can drive entity-level income to near zero or produce a loss. Because QBI is determined at the entity level after all entity-level deductions, bonus depreciation directly and materially reduces QBI before the Section 199A calculation begins. The interaction is not optional to model; it is built into the statutory structure. OBBBA also restored immediate domestic research and experimental expensing under IRC 174A, which requires an accounting method change; for the Form 3115 mechanics and the Rev. Proc. 2025-23 and 2025-28 procedures, see the Form 3115 OBBBA method change guide.

Why the error occurred

Practitioners who ran the bonus depreciation election after modeling QBI produced incorrect Section 199A results. In some software workflows, the order of data entry determined the order of calculation: entering depreciation elections after QBI had already been computed caused the software to display a QBI figure that did not yet reflect the depreciation deduction. On returns where the practitioner did not force a recalculation after the bonus depreciation entry, the error persisted into the filed return. The consequence was an overstated Section 199A deduction and an understated tax liability.

Correct sequencing: three steps, in order

The Three-Part Deduction Calculation

The Section 199A deduction is computed in one of three ways depending on where the taxpayer's taxable income falls relative to the phase-in range thresholds. All thresholds: verify current figures at IRS.gov and Rev. Proc. 2025-32; subject to annual inflation adjustment.

Taxpayers below the phase-in threshold

For taxpayers whose taxable income is below the phase-in threshold ($201,750 single / $403,500 MFJ for 2026; verify at IRS.gov), the deduction equals the lesser of: (a) 20% of qualified business income, or (b) 20% of taxable income minus net capital gains. The W-2 wage and UBIA of qualified property limitation does not apply below the threshold. The $400 minimum deduction applies to this tier if aggregate QBI is $1,000 or more (2026 figures; indexed for inflation after 2026; verify at IRS.gov): if 20% of QBI would produce a deduction below $400 but QBI is $1,000 or more, the deduction floor is $400. The minimum does not apply if QBI is negative or below $1,000. The minimum also cannot exceed 20% of taxable income minus net capital gains; the overall taxable income cap still applies.

Taxpayers in the phase-in range

For taxpayers whose taxable income falls within the phase-in range above the applicable threshold, the W-2 wage and UBIA limitation phases in proportionally. The limitation is interpolated based on where the taxpayer's income falls within the phase-in band. The interpolation calculation determines what fraction of the W-2 and UBIA limitation applies, and that partial limitation is subtracted from the uncapped 20% calculation to arrive at the allowed deduction. Form 8995-A (not Form 8995) is required for any return in the phase-in range. Verify the phase-in band width and interpolation mechanics at IRS.gov and in the Form 8995-A instructions for the 2026 tax year.

Taxpayers above the phase-out threshold: non-SSTB

For non-SSTB businesses where the taxpayer's income is above the phase-out threshold, the deduction is limited to the greater of: (a) 50% of W-2 wages allocable to the qualified business, or (b) 25% of W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition (UBIA) of qualified property placed in service by the business. This limitation replaces the uncapped 20% calculation for above-threshold non-SSTB income. The deduction remains capped at 20% of (taxable income minus net capital gains) in all cases. Verify current W-2 and UBIA limitation mechanics at IRS.gov; recently enacted per OBBBA.

Taxpayers above the phase-out threshold: SSTB income

For specified service trades or businesses (SSTBs), once the taxpayer's income is fully above the expanded SSTB phase-out band, the Section 199A deduction on SSTB income is zero. SSTBs include businesses providing services in fields such as: health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, and any trade or business where the principal asset is the reputation or skill of one or more of its employees or owners. Engineering and architecture are specifically excluded from SSTB status under the statute. During the phase-in band, a partial deduction on SSTB income may be available; verify the current SSTB phase-out band at IRS.gov and Rev. Proc. 2025-32. For entity structure considerations affecting SSTB classification, see the Business Entity Structure Guide.

Overall cap and tax attribute effects

In all three tiers, the Section 199A deduction cannot exceed 20% of (taxable income minus net capital gains). This is an absolute cap. The deduction is taken on Form 1040 Line 13 and reduces taxable income. It does not reduce adjusted gross income, so it has no effect on AGI-sensitive provisions. It also has no effect on self-employment tax (which is computed on net self-employment income before the Section 199A deduction), the alternative minimum tax (AMT), or the 3.8% net investment income tax (NIIT) under IRC Section 1411.

S-Corp Reasonable Compensation Interaction

For S-corp shareholder-employees, the Section 199A calculation creates a structural tension with the reasonable compensation requirement. Under IRC Section 199A(c)(4), W-2 wages paid by the S-corp, including wages paid to the shareholder-employee, are included in the W-2 wage pool used to compute the W-2 wage limitation. However, wages paid to the shareholder-employee also reduce entity-level income and therefore reduce QBI. The practitioner must model both effects simultaneously: higher shareholder-employee wages increase the W-2 wage pool (beneficial for the W-2 limitation calculation for above-threshold taxpayers) but reduce QBI (reducing the base on which the 20% applies). Employer retirement plan contributions add a further layer: for a self-employed owner the deduction reduces SE income, and for an S-corp the employer contribution keyed to the shareholder-employee's W-2 wages reduces entity-level income, each of which may affect the QBI deduction calculation; see the small business retirement plan SEP, SIMPLE, and Solo 401(k) compliance guide for the contribution mechanics. For a deeper treatment of the full entity selection analysis, see the Business Entity Structure Guide.

The "60/40 rule" is not an IRS safe harbor

Industry shorthand sometimes refers to a "60/40 rule" (60% salary, 40% distributions) as a benchmark for S-corp reasonable compensation. This is not an IRS-endorsed safe harbor. The IRS has not published a percentage-based safe harbor for S-corp reasonable compensation. Using the 60/40 shorthand as a planning target, without a facts-and-circumstances analysis of what reasonable compensation actually is for the specific shareholder-employee's services, is not a defensible position. State this explicitly to clients who come in expecting a formula.

IRS scrutiny post-OBBBA and documentation requirements

The IRS has signaled heightened scrutiny of S-corp compensation in the post-OBBBA environment. The combination of permanent Section 199A and restored 100% bonus depreciation creates increased incentives to minimize S-corp wages, which creates increased audit risk for returns that reflect wage levels not supportable by a facts-and-circumstances analysis. Practitioners should document the reasonable compensation determination for every S-corp shareholder-employee engagement in the client file. The documentation should address: the services actually performed by the shareholder-employee; compensation paid for comparable services in the market; the shareholder's qualifications and experience; the time and effort devoted to the business; and the compensation policy for other employees in comparable roles. See Watson v. Commissioner, TC Memo 2010-168, affirmed 668 F.3d 1008 (8th Cir. 2012), for the Eighth Circuit's analysis of what constitutes unreasonably low S-corp compensation in the context of self-employment tax avoidance. See the S-Corp Reasonable Compensation Practitioner Guide for the full facts-and-circumstances framework, compensation study approaches, and file documentation standards.

Because the OBBBA permanently extended the Section 199A deduction, a missed or late S-corp election now has a larger long-term tax cost; see our Form 2553 Late Election Relief Guide for the Rev. Proc. 2013-30 workflow and Form 8832 sequencing. When the S-corp election converts an existing C corporation, model the built-in gains exposure before advising the conversion; see our IRC 1374 built-in gains tax guide for the 5-year recognition period and NUBIG ceiling.

Aggregation Election and Form Selection

Aggregation election

The aggregation election under Treas. Reg. Section 1.199A-4 allows a taxpayer with two or more qualifying trades or businesses to treat them as a single trade or business for purposes of the W-2 wage and UBIA limitation. Aggregation can be advantageous when one business has high W-2 wages and another has high QBI but low wages: combining them increases the W-2 wage pool relative to the combined QBI, which can produce a larger deduction than computing each business separately. The election is made on a timely filed return (including extensions) and applies to all qualifying businesses included in the aggregated group. The election is not irrevocable, but unwinding it in a subsequent year requires analysis of whether the grouping still satisfies the statutory requirements. Practitioners with multi-business clients should perform the aggregation analysis before selecting the final form; the analysis may change the form required (see below). Aggregation elections involve complex multi-entity fact patterns; recommend specialist review for clients with more than two qualifying businesses or businesses with complex ownership structures. For the rental real estate safe harbor under Rev. Proc. 2019-38, including the 250-hour test and contemporaneous records requirement, see our Section 199A Rental Real Estate Safe Harbor guide.

Form 8995 vs. Form 8995-A

Form 8995 is the simplified calculation form. It is available only for taxpayers who satisfy all of the following: (1) taxable income is below the phase-in threshold; (2) no SSTB income of any kind; and (3) no aggregation election. If any of these conditions is not met, Form 8995-A is required.

Form 8995-A is required for: (a) taxpayers with any SSTB income (even if taxable income is below the threshold, if there is SSTB income, Form 8995-A is used); (b) taxpayers in the phase-in range who must compute the partial W-2 and UBIA limitation; (c) taxpayers above the phase-out threshold for any business; and (d) taxpayers making the aggregation election. Using Form 8995 when 8995-A is required is itself a preparation error; add a form-selection check to your QBI review process.

Practitioner Checklist for Section 199A (2026 Tax Year)

Work through these steps in order before finalizing any pass-through return with QBI. Each item should be confirmed and documented in the client file.

• Confirm OBBBA permanent status applies. For 2026 returns, Section 199A is permanent. No sunset planning adjustments are required for the current tax year. Verify at IRS.gov; recently enacted.
• Pull Rev. Proc. 2025-32 thresholds before computing. The 2026 phase-in thresholds are $201,750 single / $403,500 MFJ. Verify current figures at IRS.gov; subject to annual inflation adjustment.
• Run bonus depreciation first. Complete all Form 4562 bonus depreciation elections and confirm entity-level income reflects those deductions before computing QBI. Do not enter QBI into Section 199A forms until this step is complete and verified.
• Determine SSTB status for each qualifying business. Confirm whether any of the client's businesses are SSTBs. If SSTB income is present, Form 8995-A is required regardless of income level. Apply the SSTB phase-out analysis if taxable income is above the applicable threshold.
• Document reasonable compensation for every S-corp. Confirm the shareholder-employee's wages reflect a defensible facts-and-circumstances analysis. Record the documentation basis in the client file. Do not use the 60/40 shorthand as a safe harbor; it is not one. See S-Corp Reasonable Compensation Guide.
• Confirm W-2 wages from payroll records. Do not rely on software carry-forward of prior-year W-2 wages. Pull current W-2 amounts from the payroll records, W-2 filings, or the entity's books. The W-2 wage figure is the foundation of the W-2 limitation for above-threshold returns.
• Apply the $400 minimum if applicable. If aggregate net QBI is $1,000 or more and the standard 20% calculation produces a deduction below $400, apply the $400 minimum floor. Confirm the overall taxable income cap still applies. These are 2026 figures; verify inflation adjustments at IRS.gov for subsequent years.
• Select the correct form: Form 8995 or Form 8995-A. Use Form 8995 only if all three conditions are met (below phase-in threshold, no SSTB income, no aggregation election). Use Form 8995-A in all other cases.
• Check for QBI loss carry-forwards from prior years. If the client had a net QBI loss in a prior year, that carry-forward reduces current-year QBI before computing the deduction. Verify the carry-forward amount against the prior-year return.
• Verify software CFS updates before filing. Confirm that your tax preparation software has applied all current-year compliance file system (CFS) updates for Section 199A calculations and form instructions before filing any return. Software that has not been updated to reflect OBBBA changes may produce incorrect results on threshold calculations and the minimum deduction.

Frequently Asked Questions

Related Practitioner Guides

The following guides cover provisions and related tax rules that practitioners should consider alongside the Section 199A QBI deduction analysis.

• IRC 163(j) Business Interest Limitation Guide -- business interest expense that is disallowed under IRC 163(j) reduces qualified business income (QBI) under IRC 199A; practitioners computing the QBI deduction must account for the IRC 163(j) limitation before determining the 20% deduction.
• IRC 461(l) Excess Business Loss Limitation Guide -- excess business losses disallowed under IRC 461(l) reduce the net business income that feeds into the QBI deduction calculation; a taxpayer subject to the EBL limitation may have reduced or eliminated QBI available for the Section 199A deduction in the same year.
• S-Corp and Partnership Basis Tracking: Form 7203 Practitioner Guide -- pass-through owners who claim the Section 199A deduction must also track S-corp and partnership basis; the same taxpayers use both the Form 7203 basis rules and the QBI deduction, and basis limitations affect whether losses that would reduce QBI are actually deductible.
• Loss Limitation Ordering Rules: IRC 465, 469, 461(l), and 172 Guide -- losses that are suspended at an earlier layer in the five-layer loss limitation stack never reach the QBI computation; understanding which losses are available to reduce QBI in the current year requires applying the full loss limitation sequence first.
• IRC 224 and 225: No Tax on Tips and Overtime (OBBBA) -- OBBBA IRC 224 qualified tips deduction ($25,000 limit, customarily-tipped occupation test) and IRC 225 qualified overtime deduction interact with the Section 199A QBI deduction; both reduce AGI as above-the-line deductions and affect W-2 wages and QBI calculations for service-industry pass-through clients.
• IRC 280A: Home Office Deduction, Augusta Rule, and Vacation Home Limitations -- Exclusive use test, simplified method, Augusta Rule 15-day rental exclusion, and 14-day vacation home rule.
• IRC 856 REIT Qualification -- OBBBA made the 20% deduction on qualified REIT dividends under Section 199A permanent, coordinating with the IRC 856 income distribution requirement.
• IRC 857 REIT taxation -- REIT taxable income, 90% distribution requirement, capital gain dividends, and Form 1120-REIT.