QBI Deduction Phase-Out for High Earners: The Wider 2026 Band.

A management consultant runs her practice through an S corporation, nets around $250,000 a year, and assumes she gets the same 20% pass-through deduction every other business owner talks about. She gets part of it, and if her income climbs a little higher she gets none of it. Consulting is what the tax code calls a specified service business, and for those owners the qualified business income deduction shrinks across a band of income and then disappears. For 2026 that band got wider, which helps high earners, but the cliff at the top is still there.

The QBI deduction under IRC §199A lets owners of pass-through businesses (sole proprietorships, partnerships, and S corporations) deduct up to 20% of their qualified business income. On $100,000 of business profit that is a $20,000 deduction with no cash outlay, which for most owners is the single largest line on the return. The One Big Beautiful Bill Act (P.L. 119-21), signed July 4, 2025, made the deduction permanent, so it no longer expires after 2025 the way the original 2017 version was scheduled to.

The catch is that Congress did not want the full deduction flowing to high-income professionals whose business is really just their own labor. So §199A(d) singles out the specified service trade or business (SSTB), and above an income threshold it strips the deduction from those owners. Below the threshold none of this matters: every pass-through owner gets the full 20%, and the service-business label is irrelevant. The phase-out only bites once taxable income crosses the line.

The threshold where the phase-out begins is indexed for inflation each year. For 2026, under Rev. Proc. 2025-32, it is $201,750 of taxable income for single filers and $403,500 for married couples filing jointly. Taxable income here means taxable income figured before the QBI deduction itself, not adjusted gross income. Below those numbers an SSTB owner takes the full 20% with no wage test and no service-business restriction.

Above the threshold the deduction phases out across a range of income, and this is the part the new law changed. Through 2025 that range was $50,000 for singles and $100,000 for joint filers. Starting in 2026, §70105 of the One Big Beautiful Bill Act widened it to $75,000 and $150,000. So the full phase-out now runs from $201,750 to $276,750 for a single filer and from $403,500 to $553,500 for a joint filer. A wider band means the deduction falls more slowly, so more owners keep a partial deduction at income levels that used to wipe it out entirely.

Inside the phase-out band the deduction is not all-or-nothing. You figure an applicable percentage, which is 100% reduced by how far your income sits through the range. A single filer at $239,250 of taxable income is $37,500 into the $75,000 range, exactly halfway, so the applicable percentage is 50%. That percentage is applied to your qualified business income and your W-2 wages before the 20% is taken, so at the halfway point only half of your QBI counts. At the top of the range the applicable percentage reaches zero, and for an SSTB owner the deduction goes with it.

The SSTB list in §199A(d)(2) covers health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, and investing or investment management. It also sweeps in any business whose principal asset is the reputation or skill of its owners or employees. Treas. Reg. §1.199A-5 defines each field narrowly. Health, for instance, means doctors, dentists, therapists, and similar providers acting in their professional capacity, not the owner of a health club or a medical-device company.

What is left off the list matters just as much. Engineering and architecture were deliberately excluded, so those firms keep the deduction above the threshold, subject only to the wage test that applies to every non-service business. Same for most trades, manufacturing, retail, real estate, and software. If you own a non-SSTB, crossing the threshold does not kill your deduction; it just switches you to a different limit, capping it at the greater of 50% of the W-2 wages your business paid, or 25% of those wages plus 2.5% of the cost of your business property. That is why a profitable non-service business with real payroll often keeps most of the deduction while a solo consultant loses all of it. It is the same wage machinery behind the rental QBI safe harbor.

For an SSTB owner near the threshold, the whole game is getting taxable income down, because every dollar below $201,750 single (or $403,500 joint) is a dollar that stops eroding the deduction. A 401(k) or defined benefit plan contribution, a cash-balance plan, or bunching deductions into one year can each pull you back under the line. For someone deep in the phase-out, a $30,000 retirement contribution does two jobs at once: it saves tax on the $30,000 directly, and it may hand back thousands of dollars of QBI deduction the income was suppressing. I model both effects together, because the second one is easy to miss and it makes the contribution look far better than its sticker rate suggests.

One more 2026 change helps at the bottom of the income scale rather than the top. The One Big Beautiful Bill Act created a minimum QBI deduction of $400 for any taxpayer with at least $1,000 of qualified business income from an active business they materially participate in, indexed for inflation after 2026. It will not change life for a high earner, but it guarantees a small-business owner with modest profit gets something. State pass-through entity taxes interact here too, because a PTET payment lowers the taxable income the phase-out is measured against.