Preserve the QBI Deduction
Through the Phase-Out for S-Corp Owners: Section 199A in 2026
The 20% Section 199A deduction for pass-through income doesn't disappear all at once — but it can be managed.
When the Tax Cuts and Jobs Act introduced Section 199A in 2018, it created a potential 20% deduction on qualified business income (QBI) for pass-through entities — S-corps, partnerships, and sole proprietorships. For an owner whose deduction lands fully at the top marginal bracket, that translates to roughly 7.4 percentage points of effective tax rate. On $500,000 of qualified business income, that is up to $37,000 in annual federal tax savings.
For seven years, this deduction sat under a sunset cloud. The One Big Beautiful Bill Act (OBBBA), signed in July 2025, made Section 199A permanent and widened the phase-in ranges starting in 2026. The QBI deduction is no longer a use-it-or-lose-it window — it is a permanent fixture of the code that rewards thoughtful, recurring planning.
The catch is still the income thresholds. Above a certain level, the deduction phases out. For owners of professional service businesses, it can vanish entirely. For everyone else, a different limitation kicks in. Understanding which lane you sit in — and which planning moves are yours — is the highest-leverage tax conversation a business owner has each year.
The Two Lanes: SSTB vs. Non-SSTB Pass-Throughs
The 199A phase-out is not a single rule. It is two different rules, depending on how the IRS classifies your business.
If you operate a specified service trade or business (SSTB) — consulting, financial services, health, law, accounting, performing arts, athletics, brokerage services, and any business whose principal asset is the reputation or skill of one or more employees — your deduction phases down across a $150,000 income band (joint) and disappears completely above the upper threshold. There is no W-2 wage workaround, no qualified property workaround. The only effective lever is taxable income itself.
If you operate a non-SSTB pass-through — manufacturing, real estate, technology, most product and infrastructure businesses — your deduction does not vanish. Instead, above the threshold it is capped by a wage and property test: the deduction is limited to the greater of (a) 50% of W-2 wages paid by the business, or (b) 25% of W-2 wages plus 2.5% of the unadjusted basis of qualified property. The lever there is structural — salary levels, capital deployment, and entity aggregation — not income compression.
These are two genuinely different planning problems and they call for different moves.
2026 QBI Thresholds, Visualized
The QBI deduction begins to phase out at $403,500 of taxable income for married filing jointly ($201,750 for single filers). For SSTBs, the deduction is fully eliminated at $553,500 MFJ ($276,750 single). Non-SSTB businesses above the threshold face a wage and property cap rather than full elimination.
The critical phrase is taxable income — not gross income, not AGI, but income after all deductions. This matters enormously, because pre-tax retirement contributions, health insurance deductions, and other above-the-line deductions all reduce taxable income, which directly affects where you fall in the phase-out range.
QBI Deduction — 2026 Thresholds Summary
Full 20% deduction (MFJ): below $403,500
Partial deduction (SSTB): $403,500 – $553,500
No deduction (SSTB, MFJ): above $553,500
Single filers: halve all thresholds
Phase-in band (2026): $150,000 MFJ / $75,000 single
The SSTB Lane: How Professional Service Owners Preserve the QBI Deduction
If you are a professional service owner, the only real goal is keeping taxable income inside the deduction zone. Three levers do most of the work.
Retirement Plan Layering: 401(k) + Cash Balance
The most powerful single move is layering an owner-favored cash balance defined benefit plan on top of a 401(k) with profit sharing. For 2026, the employee deferral on the 401(k) is $24,500, with an additional $8,000 catch-up at age 50 and $11,250 at ages 60 to 63. Layered with a profit-sharing component, the 401(k) side can absorb roughly $70,000 to $80,000 of pre-tax income for an owner-only plan. A cash balance plan on top — actuarially sized to age and compensation — can add another $100,000 to $300,000 annually for owners in their 50s and 60s. For an SSTB owner $200,000 above the threshold, this layered structure is often the single move that brings them back inside the deduction zone. Note that beginning in 2026, age-based catch-up contributions for owners with prior-year FICA wages above $145,000 must be made on a Roth basis, which removes their taxable-income-reducing effect — a subtle but important wrinkle for high-W-2 owners.
Charitable Bunching Through a Donor-Advised Fund
Front-loading three to five years of charitable giving into a single year via a donor-advised fund compresses taxable income in the contribution year while preserving the standard deduction in the off-years. For owners whose income spikes in a single year (an exit year, a partner buy-in year, a one-time bonus year), DAF bunching is often what keeps the deduction available in exactly the year that matters most.
Income Smoothing Across Tax Years
For owners with discretionary control over revenue and expense timing, the goal is rarely "minimize this year's taxable income." It is "minimize the multi-year tax bill." Accelerating expenses, deferring receivables, and using bonus depreciation or §179 expensing on equipment lets you target a steady taxable income that stays in the deduction zone year after year, instead of a boom year that loses the deduction entirely followed by a leaner year that does not need the planning.
The Non-SSTB Lane: The W-2 Wage Limit in 199A
For owners of non-SSTB pass-throughs, taxable income compression is helpful but not the main game. The deduction does not disappear — it gets reshaped by the wage and property test. Three structural moves matter most.
S-Corp Salary Optimization for QBI
Pay yourself too little, and the 50%-of-wages cap collapses, killing your deduction. Pay yourself too much, and the salary itself is not QBI, eroding the deduction base from the other side. The math has a sweet spot, and for many owners it lands at roughly 25% to 30% of total business net income — but the exact number depends on the business's qualified property base, the owner's other income, and the household's overall taxable income relative to the threshold. This is a calculation, not a rule of thumb. Owners who set their salary by what feels reasonable, rather than by running the optimization, routinely leave $10,000 to $40,000 of deduction on the table.
The §1.199A-4 Aggregation Election
If you own multiple non-SSTB pass-throughs — say a holding company, an operating company, and a real estate entity — you can elect to aggregate them for QBI purposes, sharing W-2 wages and qualified property across the group. This is one of the most powerful and least-used levers in 199A planning. An entity with high QBI but no payroll can borrow wage capacity from a sister entity that has plenty. The election has technical requirements (common ownership, similar trade or business, no SSTBs in the group) and is sticky once made, but for owners with structured operations it is often the difference between a partial deduction and a full one.
REIT and PTP Dividends: A Separate QBI Bucket
A point that even sophisticated owners miss: Section 199A also gives a 20% deduction on qualified REIT dividends and publicly traded partnership income, with no W-2 wage limit and no SSTB exclusion. For high-earning SSTB owners who have lost their business deduction entirely, this remains a meaningful planning lane on the investment side of the balance sheet. Allocating a deliberate slice of the portfolio to REITs in taxable accounts can recapture some of what the SSTB rules took away.
Worked Example: A Charlotte Consultant in the QBI Phase-Out
"Sarah," Charlotte Consultant, Age 52
Sarah runs an S-corp consulting practice (an SSTB). In 2026, the business will throw off $620,000 of net income. She files jointly; her husband earns $90,000 as a W-2. Itemized deductions: $30,000.
Without planning, household taxable income lands above $553,500. Her SSTB deduction is zero.
Solo 401(k) (deferral + catch-up + profit share): ~$78,000
Cash balance plan (age 52, max accrual): ~$180,000
DAF — three years of charitable bunching: $45,000
Family HSA: $8,750
Total pre-tax compression: ~$311,750
That moves household taxable income from above the ceiling to roughly $440,000 — inside the partial-deduction band, with about three-quarters of the deduction available. On her qualified business income, that recovers roughly $90,000 to $100,000 of deduction value she would otherwise have lost. Federal tax savings: in the neighborhood of $30,000 to $35,000, in a single year, on income that did not change.
Illustration only. Actual results depend on the SE-tax interaction with cash balance contributions, plan design and actuarial accrual rates, and the 20%-of-taxable-income ceiling that applies to the deduction itself.
When to Have the 199A Conversation: The Year-End Planning Window
QBI planning is not a December 31 conversation — it is a September or October conversation. By October, year-to-date income is known with reasonable confidence and there is still time to act. By December, most of the levers are gone.
- Solo 401(k) plan documents must be formally established by year-end — a hard deadline, no extensions.
- Cash balance plans require actuarial design and adoption paperwork that takes weeks, not days.
- S-corp salary true-ups must run through year-end payroll, not booked retroactively in February.
- Equipment purchases for §179 or bonus depreciation must be in service before December 31, not merely ordered.
- DAF contributions of appreciated securities need lead time to clear before year-end.
Owners who run this conversation in October are making decisions. Owners who run it in January are reviewing history.
The New $400 Minimum QBI Deduction (Beginning 2026)
Beginning in 2026, taxpayers with at least $1,000 of QBI from an active trade or business in which they materially participate are guaranteed a minimum deduction of $400, even when other limitations would push the calculation lower. It is a small floor, not a planning lever, but it provides a useful safety net in transitional or low-income years for owners with marginal QBI.
Frequently Asked Questions About the 2026 QBI Deduction
Is the QBI deduction permanent in 2026?
Yes. The One Big Beautiful Bill Act, signed in July 2025, removed the §199A sunset provision and made the 20% qualified business income deduction a permanent fixture of the tax code beginning in 2026.
What is the QBI deduction income threshold for 2026?
For married filing jointly, the QBI phase-out begins at $403,500 of taxable income and (for SSTBs) is fully phased out at $553,500. Single filers are at half those amounts: $201,750 and $276,750. These thresholds are indexed annually for inflation.
What is a Specified Service Trade or Business (SSTB)?
SSTBs include businesses in the fields of health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, investing and investment management, trading, dealing in securities, and any business whose principal asset is the reputation or skill of one or more employees. Owners of SSTBs lose the QBI deduction entirely above the upper threshold; non-SSTB pass-throughs do not.
Can SSTB owners do anything to preserve the QBI deduction above the threshold?
The only effective lever for SSTBs above the threshold is reducing taxable income — primarily through retirement plan layering (401(k) plus cash balance plan), donor-advised fund contributions, and income smoothing. There is no W-2 wage or qualified property workaround for SSTBs.
What is the §1.199A-4 aggregation election?
The aggregation election lets owners of multiple non-SSTB pass-through businesses combine them for QBI purposes, sharing W-2 wages and qualified property across the group. Aggregation requires common ownership and similar trade or business activity, and once made, the election is largely sticky. It is one of the most underused planning tools for owners with structured operations.
199A is the conversation that pays for itself in a single year. Owners in or near the phase-out range who have not run a current 199A model with their advisor and tax preparer this year are usually leaving five-figure savings on the table — and now that the deduction is permanent, they are leaving them every year they do not.
If you want to know whether this applies to your situation specifically, that is a conversation we have every fall with our owner clients.
This article is for educational purposes only and does not constitute individualized tax, legal, or investment advice. Tax law and inflation-adjusted thresholds are current as of the 2026 tax year (IRS Rev. Proc. 2025-32) and may change. Consult with a qualified advisor regarding your specific situation. Llewellyn Financial is a fee-only, fiduciary RIA based in Charlotte, NC.
