For eight years, every pass-through owner who claimed the 20% Qualified Business Income (QBI) deduction lived with a quiet countdown clock in the back of their tax planning. Section 199A, born in the 2017 Tax Cuts and Jobs Act, was scheduled to expire on December 31, 2025. Then, on July 4, 2025, the One Big Beautiful Bill Act (OBBBA) tore the expiration date out of the statute.
The deduction is now permanent. The phase-in ranges are wider. A new $400 minimum kicks in for small operators. And the same wage-and-property guardrails that have always rewarded businesses with payroll and real assets are still there—only now they are guardrails on a road that doesn't end.
If you own an interest in an S corporation, partnership, LLC, or sole proprietorship, here is what changed, what stayed the same, and how to lock in the full 20% deduction in 2026 and beyond.
What Section 199A Actually Gives You
In its simplest form, Section 199A lets non-corporate taxpayers deduct up to 20% of their qualified business income (QBI) from a domestic pass-through business. The deduction is taken on your personal Form 1040—it doesn't affect the business's books—and it reduces your federal taxable income without lowering your self-employment tax, net investment income tax, or state tax in most states.
The overall ceiling is the lesser of:
- 20% of combined QBI from all your qualified businesses, or
- 20% of (taxable income − net capital gains).
If your only income is from a pass-through and you have no large capital gains, the practical answer is usually the first number. If you have a big stock sale or a real estate gain in the same year, the second cap can shrink your deduction.
QBI itself is the net of business income, gains, deductions, and losses from a qualified trade or business inside the United States. It excludes capital gains, dividends, most interest income, reasonable compensation paid to S corporation owners, and guaranteed payments to partners. Real estate investment trust (REIT) dividends and publicly traded partnership (PTP) income get their own separate 20% deduction bucket.
What OBBBA Changed for 2026
OBBBA made three meaningful adjustments to the structure of Section 199A, on top of the permanence headline.
1. The 20% rate stays at 20%
Earlier drafts of the legislation floated bumping the rate to 23%. That didn't make the final bill. The deduction rate remains 20%, but it now has no sunset.
2. Wider phase-in ranges for SSTB and wage limits
Under the old law, the wage / property and Specified Service Trade or Business (SSTB) limitations phased in over a range of:
- $50,000 above the threshold for single filers
- $100,000 above the threshold for joint filers
Starting in 2026, those phase-in windows widen to:
- $75,000 above the threshold for single filers
- $150,000 above the threshold for joint filers
Combined with annual inflation adjustments to the base threshold (which is projected to land near $203,000 single / $406,000 joint for 2026), the practical phase-out range stretches to roughly $203,000–$278,000 for single filers and $406,000–$556,000 for joint filers. That extra runway matters most to SSTB owners and to businesses with thin payrolls.
3. A new $400 minimum deduction for active small owners
Starting in 2026, if you have at least $1,000 of QBI from one or more qualified trades or businesses in which you materially participate, you are guaranteed a minimum deduction of $400. The $400 floor is indexed for inflation in later years. It mostly benefits very small side hustles and early-stage businesses whose 20% calculation would otherwise come in below that floor.
The Three-Lane Highway: Where You Fall on the Income Map
The mechanics of Section 199A look different depending on your taxable income relative to the threshold. Think of it as a three-lane highway.
Lane 1: Below the threshold (the simple lane)
If your taxable income (line 15 of Form 1040, before the QBI deduction) is at or below the threshold—again, roughly $203,000 single / $406,000 joint in 2026—the math is mercifully simple:
- You get 20% of your QBI.
- You don't have to test W-2 wages.
- You don't have to test the unadjusted basis of property.
- It doesn't matter whether your business is an SSTB.
This is where most small business owners live, and OBBBA changes nothing about how easy this lane is.
Lane 2: Inside the phase-in range (the messy middle)
If your taxable income is above the threshold but below the top of the phase-in range, two things start happening at the same time:
- The W-2 wage and UBIA limitation starts to bite, on a pro-rata basis.
- If you own an SSTB, the percentage of QBI that "counts" starts to shrink, also on a pro-rata basis.
The phase-in is linear. If you are halfway through the phase-in window, half of the wage limitation applies and half of the SSTB haircut applies.
This is the most error-prone lane on the highway because the formulas are intertwined and small income changes can swing the deduction by thousands of dollars. It is also the lane where year-end planning has the highest leverage.
Lane 3: Above the phase-in range (the strict lane)
Once you're past the top of the phase-in, two hard rules apply:
- SSTB income gets zero deduction, period.
- Non-SSTB income gets the full wage / property test: your deduction per business is the lesser of 20% of QBI or the greater of (a) 50% of W-2 wages paid by that business or (b) 25% of W-2 wages plus 2.5% of the UBIA of qualified property.
If you're a high-earning consultant, doctor, lawyer, or financial advisor with no separable non-SSTB activities, this is where the deduction disappears. If you're a high-earning manufacturer, software company, or rental real estate operator, this is where you suddenly need to care a lot about payroll and asset basis.
Decoding "SSTB": The List That Decides Everything
A Specified Service Trade or Business is, per the statute, any trade or business involving the performance of services in the fields of:
- Health
- Law
- Accounting
- Actuarial science
- Performing arts
- Consulting
- Athletics
- Financial services
- Brokerage services
- Investment management
- Trading or dealing in securities, partnership interests, or commodities
- Or any trade or business where the principal asset is the reputation or skill of one or more employees or owners (the catch-all clause that has generated more planning anxiety than any other phrase in the regulations).
Notably absent from the SSTB list: engineering, architecture, software development, manufacturing, restaurants, retail, real estate, e-commerce, and most trades. Those businesses pass the SSTB test no matter how high your income climbs—they only need to clear the wage / UBIA hurdle.
A small mercy from the regulations: a business with less than 10% of gross receipts from SSTB activities (5% if gross receipts exceed $25 million) is not treated as an SSTB at all. That's a meaningful escape valve for hybrid businesses.
The W-2 Wage and UBIA Test, in Plain English
Above the phase-in for non-SSTBs, your deduction per business is capped at the greater of:
- 50% of W-2 wages the business paid during the year, or
- 25% of W-2 wages plus 2.5% of UBIA of qualified property.
W-2 wages here means wages reported on Form W-2, properly allocable to the QBI of the business, and reported on timely-filed information returns. Contractor payments on 1099s don't count. Guaranteed payments to partners don't count. Reasonable compensation to S corporation owner-employees does count.
UBIA—unadjusted basis immediately after acquisition—is the original cost of tangible depreciable property used in the business, measured before any depreciation deductions. Property counts toward UBIA only during its depreciable recovery period (or 10 years, if longer). A building you bought for $2 million in 2018 still contributes $2 million of UBIA in 2026. A piece of equipment you fully depreciated under bonus depreciation in 2018 with a 5-year recovery period dropped out of your UBIA calculation in 2023.
The 2.5% of UBIA route exists specifically so that capital-intensive businesses (think real estate, manufacturing, agriculture) aren't punished for using machines instead of payroll.
Three Worked Examples
These illustrative scenarios use round numbers and the projected 2026 thresholds.
Example A: A solo consultant under the threshold
A self-employed marketing consultant files jointly with $300,000 of taxable income, of which $250,000 is QBI from her sole proprietorship.
She's well under the $406,000 joint threshold, so the SSTB question is irrelevant. Her QBI deduction is 20% × $250,000 = $50,000, reducing her federal taxable income to $250,000.
Example B: An S corporation owner-doctor in the messy middle
A dentist owns 100% of an S corporation. She pays herself a $200,000 W-2 salary (reasonable compensation), the S corp produces $400,000 of net income after that salary, and her household's joint taxable income is $475,000.
Dentistry is health—an SSTB. Her taxable income of $475,000 sits squarely inside the 2026 phase-in band ($406,000 to roughly $556,000). She is about 46% of the way through the $150,000 phase-in window.
The "applicable percentage" of SSTB QBI that still counts is 1 − 0.46 = 54%. So her allowed QBI becomes $400,000 × 54% = $216,000, and her pre-limit deduction is 20% × $216,000 = $43,200.
She also has to apply 46% of the wage / UBIA limit. The greater of 50% of $200,000 wages ($100,000) or 25% of wages plus 2.5% of UBIA (suppose her UBIA is $300,000 of equipment, giving $50,000 + $7,500 = $57,500) is $100,000. The full wage cap on the 54% of QBI is the greater limit. After the proportional phase-in, her actual deduction calculation produces a number close to $43,200—the wage cap doesn't bind because she pays significant W-2 wages.
Example C: A high-income non-SSTB with skinny payroll
An LLC taxed as a partnership runs a 25-employee custom millwork shop. Two co-owners split everything 50/50. The shop pays $1.2 million of W-2 wages, holds $800,000 of UBIA in machinery still within its recovery period, and produces $2 million of QBI. Each owner has $1 million of QBI and joint taxable income of $900,000—well above the phase-in.
Millwork isn't an SSTB, so 100% of QBI counts. But each owner must pass the wage / UBIA test on his $1 million share. The wage / UBIA limit per owner is the greater of:
- 50% of $600,000 wages allocated = $300,000, or
- 25% of $600,000 wages + 2.5% of $400,000 UBIA = $150,000 + $10,000 = $160,000.
So each owner's cap is $300,000. The pre-cap deduction would be 20% × $1,000,000 = $200,000. Since $200,000 is less than the $300,000 cap, each owner deducts the full $200,000. The shop's hefty payroll preserved the full 20%.
Six Planning Moves That Still Work in 2026
OBBBA's permanence and wider phase-ins reset the planning calendar but don't change the playbook. Here are the levers that move the most dollars.
1. Manage taxable income around the threshold
Above-the-line moves that shrink your taxable income—not just your business income—can pull you back into Lane 1 or earlier in Lane 2. The biggest levers are retirement contributions (Solo 401(k), SEP IRA, defined benefit / cash balance pension plan), HSA contributions, and timing of itemized deductions through bunching. A $30,000 Solo 401(k) deferral in the phase-in band can recover several thousand dollars of QBI deduction.
2. Pay close attention to S corporation reasonable compensation
Reasonable compensation is the eternal balancing act for S corp owners. Pay yourself too little and the IRS reclassifies distributions as wages. Pay too much and you shrink QBI (wages reduce the corporation's pass-through income) while potentially padding the wage cap you don't need. Above the phase-in, modeling matters: in a non-SSTB with already adequate wages, every extra dollar of salary may cost you 20 cents of QBI deduction without buying you any extra wage-cap headroom.
3. Separate SSTB and non-SSTB activities into different entities
If a law firm also licenses proprietary software, runs a CLE training subsidiary, or sells branded merchandise, those revenue streams can sometimes be operated through a separate, commonly owned LLC that is not an SSTB. Done with real economic substance, the non-SSTB entity preserves a 20% deduction on its slice of profit that would otherwise be wiped out by the SSTB phase-out at high income.
4. Aggregate non-SSTB businesses for a better wage / UBIA test
The regulations let you aggregate multiple non-SSTB trades or businesses if they meet common-ownership and operational tests. Aggregation lets you pool W-2 wages and UBIA across the group, which often rescues the deduction for a low-wage / high-UBIA operation paired with a high-wage / low-UBIA operation. Aggregation is irrevocable once elected, so model it before you commit.
5. Time equipment purchases to coordinate with bonus depreciation
With 100% bonus depreciation back in play under OBBBA, large equipment buys can compress current-year taxable income enough to slide you under the phase-in—or even back below the threshold. The same purchase adds to UBIA for QBI purposes, raising your wage / UBIA ceiling for future years. The two-for-one effect is one of the most powerful planning moves available to capital-heavy businesses.
6. Use the "less than 10%" SSTB exception when you legitimately qualify
For a business with mixed activities, the 10%-of-gross-receipts safe harbor (5% if receipts exceed $25 million) can keep the whole entity out of SSTB status. This requires clean revenue tracking by line of business—exactly the kind of detail that disorganized bookkeeping erases.
What Hasn't Changed (and Probably Won't)
A few stubborn realities of Section 199A survived the legislation intact, and they're worth remembering before you build a planning strategy around any single number:
- The deduction is personal, claimed on Form 1040 by the owner, not by the entity. Each pass-through reports QBI components on Schedule K-1, and the owner does the arithmetic.
- The deduction does not reduce self-employment tax or net investment income tax. It also doesn't change AGI, which means it doesn't affect AGI-based phaseouts elsewhere on your return.
- C corporations get nothing from Section 199A. They have the 21% corporate rate instead. Converting from an S corp to a C corp (or vice versa) remains a multi-year, multi-factor decision that QBI alone shouldn't drive.
- Rental real estate can qualify, but only if the activity rises to the level of a trade or business under Section 162. The Section 199A safe harbor (Rev. Proc. 2019-38) for rental real estate enterprises with 250+ hours of rental services per year is still the cleanest path.
- Negative QBI from one business reduces positive QBI from your other businesses, with leftover negatives carrying forward to next year.
Why Clean Bookkeeping Is Now a QBI Strategy
The Section 199A calculation depends on numbers that come straight out of your books: net business income, W-2 wages paid, the cost basis of every depreciable asset still inside its recovery period, the share of revenue from SSTB vs. non-SSTB activities, and—if you aggregate—how those numbers stack across multiple entities.
Most QBI audits don't fail because the deduction strategy was wrong. They fail because the underlying records can't substantiate the strategy. Aggregation elections get challenged because aggregation criteria can't be documented. The 10% SSTB safe harbor falls apart because nobody separated SSTB revenue from non-SSTB revenue in the chart of accounts. UBIA balances are wrong because asset additions and disposals weren't tracked by recovery period.
If you're going to claim the QBI deduction in 2026 and beyond, your books need to support it. That means a chart of accounts that segregates SSTB and non-SSTB revenue if you operate both, a fixed-asset register that tracks each asset's UBIA and recovery period (not just net book value), and payroll records that tie W-2 wages to the specific business that paid them.
Keep Your Pass-Through Records QBI-Ready
The Section 199A deduction is now permanent, but the deduction only survives the audit if your records can defend it. Beancount.io gives you plain-text accounting that's transparent, version-controlled, and AI-ready—every transaction, fixed asset, and payroll classification stays auditable years later, exactly when you need it. Get started for free and keep your QBI strategy on solid ground.