Above the QBI income thresholds, the W-2 wage limits apply per business. Aggregation lets a wage-heavy company support a wage-light one — if you meet the tests.
If you own more than one business and your income is above the QBI thresholds, aggregation may be the single biggest lever left on your 20% QBI deduction. Here's the problem it solves: above the thresholds, the deduction is capped per business by that business's W-2 wages (or wages plus property). A profitable business that pays no wages can watch its deduction shrink toward zero — while your other business sits on a payroll it isn't fully "using." Aggregation lets you elect to treat qualifying businesses as one, pooling income and wages so the strong payroll supports the wage-light profit.
It's not automatic and not always available — there are ownership and relatedness tests, SSTBs are excluded, and the election is sticky. This post covers when the limits bite, what aggregation requires, and a worked example showing the dollars.
Below the income thresholds, QBI is simple: 20% of qualified business income, no wage test. For 2026, the phase-in starts at $201,750 of taxable income for single filers and $403,500 for joint filers, with the limits phasing in over the next $75,000 / $150,000. (The deduction itself is now permanent, and from 2026 there's even a $400 minimum deduction if you have at least $1,000 of active QBI.)
Once you're through the phase-in range, each business's deduction is capped at the greater of:
The key word is that business's. Without aggregation, the computation runs entity by entity. A business with $300,000 of profit and zero W-2 wages gets a wage limit of zero — its tentative $60,000 deduction can be crushed regardless of how much payroll your other companies run. Wages in one silo can't rescue income in another. Aggregation tears down the silo walls.
When you aggregate, you compute QBI, W-2 wages, and UBIA as if the aggregated businesses were a single business: add up the income, add up the wages, add up the property basis, then apply the limit once to the combined numbers. That's the entire mechanic — and for the right fact pattern it converts a zeroed-out deduction into a full one.
You can aggregate businesses only if all of the following hold:
The two-of-three test is where real planning happens. An operating company and the sibling entity that owns its building and rents it back will usually satisfy shared management and coordinated operation. Two genuinely unrelated ventures — a landscaping company and a t-shirt brand — usually won't, no matter how convenient aggregation would be.
Meet a married couple, well above the thresholds, owning two businesses:
Without aggregation:
With aggregation:
Same businesses, same numbers, $25,000 more deduction — worth roughly $9,000 a year at a 35%-ish marginal rate, recurring. This OpCo/PropCo pattern (self-rental supporting an operating company) is the classic aggregation win; note that a self-rental to your own operating business is also generally treated as a qualifying trade or business for QBI in the first place. For standalone rentals chasing QBI status on their own, the rental safe harbor rules are the relevant path.
Aggregation doesn't create income or wages — it just lets your businesses share them. When one entity has the profit and another has the payroll, that sharing is the whole ballgame.
Aggregation is an election you disclose on your return, with a required annual statement identifying the aggregated businesses. And it's sticky: once you aggregate a group, you must keep reporting them that way in future years. You can add a newly qualifying business to an existing group, but you can't casually unwind the group because the math flipped against you — dis-aggregation is only allowed when the facts change enough that the requirements are no longer met (say, ownership drops below 50%).
So run the projection both ways before electing, and not just for one year. Aggregation helps when wages are lopsided relative to income; it can hurt in loss years, because an aggregated business's loss nets directly against the group's income before the deduction is computed. Model a bad year for each entity, not just the good ones.
If you're above the QBI thresholds with multiple commonly-owned, non-SSTB businesses — especially a wage-paying operating company next to a wage-light profit center — aggregation can rescue a deduction the per-business wage limits would otherwise destroy. Check the 50% ownership test, the two-of-three factors, and model the election over several years, because it doesn't unwind easily. Taxagon's CPAs and EAs run these projections and file the aggregation statements as part of tax planning for multi-entity owners every season — if your entities have never been looked at as a group, reach out.
This article is general information, not tax advice for your specific situation. Tax law changes; figures are for the years stated.
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