QBI deduction: what it is, what it isn't, who's losing it
The 20% qualified-business-income deduction is one of the most valuable lines on the return — and one of the most commonly mis-claimed.
The qualified business income deduction — Section 199A — is the rare tax provision that survived two presidential administrations, three Congresses, and OBBBA. It deducts up to 20% of qualified pass-through income from your taxable income, before the rate is applied. For a sole proprietor or S-corp owner in the 24% bracket, that is a hard 4.8 percentage points off the top of the bill.
The catch is that almost half of the businesses we onboard are claiming it incorrectly. Either they’re missing it, or they’re claiming it when they shouldn’t, or they’re claiming the right amount for the wrong reason and the audit risk is unmanaged.
The version that fits on a Post-it
If your taxable income is below the phase-out — $241,950 single, $483,900 joint this year — you almost certainly qualify for 20% of your qualified business income, full stop. Take it.
Above the phase-out, the rules split. Specified service trades or businesses (SSTBs — law, accounting, consulting, financial advice, health, performing arts, athletics) phase out and then disappear. Non-SSTBs phase into a wage-and-property-based limitation that often still allows the deduction, just calculated differently.
The phase-out is on taxable income, not on business income. Owners who manage their below-the-line deductions can pull themselves under the threshold and unlock the full 20%.
Three planning moves
One — retirement contributions are not just for retirement. A SEP-IRA, solo 401(k) or defined-benefit plan contribution lowers your taxable income dollar for dollar. For owners floating just above the QBI threshold, the contribution can pay for itself twice — once in the deferred tax on the contribution, once in the unlocked QBI on the remaining income.
Two — bunch itemized deductions. Charitable contributions, state and local taxes (up to the SALT cap), and qualified medical expenses can be timed to land in the year you most need them. We’ve moved clients in and out of the QBI threshold by $4,000 of deduction timing alone.
Three — re-evaluate your entity classification. If your business is an SSTB and your income is well above the phase-out, no amount of planning fixes the QBI math. But the rest of your tax picture may still favor an S-corp election, a holding-company structure, or a partnership with active and passive partners. The deduction is one of several inputs, not the whole answer.
The most common error
It is not the SSTB classification. It is owners on the S-corp election counting all of their business income — distributions plus W-2 wages — as QBI. W-2 wages paid to yourself are not QBI. Only the K-1 pass-through portion is. Half the corrected returns we file in any given year are this exact error.
What we tell clients
For most owners under the phase-out, QBI is automatic. For owners near or above the threshold, it is a planning question that should be settled in November, not April. We run the numbers on the last three returns when we onboard, and the median QBI correction we find is worth about $2,400 a year. If you’d like that review, book a call and bring the last three returns.
