The QBI aggregation rules let you treat several trades or businesses as one when you apply the W-2 wage and property limits on the Section 199A deduction. To qualify, one person or group must own 50% or more of each business for most of the year, none can be a specified service trade or business (SSTB), and the businesses must meet at least two of three connection factors. You then have to disclose the choice every year. Aggregation is optional, it can raise or leave unchanged your deduction, and it is easy to get wrong on paper.
This guide walks through each test, shows a worked example with numbers, and covers the reporting steps that trip up owners with more than one entity.
TL;DR
- Aggregation is a choice, not a requirement. It combines QBI, W-2 wages and qualified property (UBIA) across businesses before the wage and property limits are applied.
- You need 50% or more common ownership of each business, the same tax year, no SSTBs, and at least two of three relatedness factors.
- Aggregation only matters when your taxable income is above the threshold. Below it, the wage and property limits do not apply.
- You must attach a statement every year and report the aggregation consistently. A missed statement can lead to disaggregation and a three-year lockout.
- There is no "2/7 rule" inside the aggregation regulation. The tests are the 50% ownership rule and two of three connection factors.
Table of Contents
- What aggregation does for your QBI deduction
- Do the 2026 thresholds make aggregation relevant to you?
- The four requirements to aggregate
- A worked example
- How to aggregate and report it
- Changing or losing an aggregation
- Common aggregation mistakes
- Our perspective
- Getting help with an aggregation decision
- FAQ
- Sources
What aggregation does for your QBI deduction
The Section 199A deduction is generally up to 20% of qualified business income, capped at 20% of taxable income. Above an income threshold, each business is normally tested on its own against a limit based on W-2 wages paid and the unadjusted basis of qualified property. That is the "stands on its own" default.
The aggregation regulation changes the default. Under 26 CFR 1.199A-4, individuals and relevant pass-through entities may, but are not required to, aggregate trades or businesses as a single trade or business for applying those limitations. When you do, QBI, W-2 wages and UBIA of qualified property are combined for the limit calculation.
That matters when your businesses are lopsided. One entity may have strong profit and no payroll. Another may have heavy payroll and thin profit. Tested separately, the first might be capped hard. Combined, the wages of the second can support the profit of the first. The IRS-focused Tax Adviser analysis makes the same point: aggregation may allow a larger deduction than applying the limits separately.
Aggregation does not create deduction out of nothing. If your businesses all have healthy wages, or you are under the threshold, combining them changes little.
Do the 2026 thresholds make aggregation relevant to you?
For 2026, one planning summary reports the phase-in thresholds at $403,500 for joint filers and $201,750 for single filers and heads of household, with the phase-out threshold at $553,500 for joint filers and $276,750 for single filers. The same source notes that starting in 2026 the phase-in range for the wage and investment limits widens, from $100,000 to $150,000 for married couples filing jointly. Confirm the current figures against the Instructions for Form 8995 when you file.
Here is how that plays out:
| Taxable income (before QBI deduction) | Wage and property limits | Aggregation matters? |
|---|---|---|
| At or below the threshold | Do not apply | No |
| Inside the phase-in range | Phase in gradually | Often, in part |
| Above the range | Apply in full | Yes, most of all |
A single owner with one S corporation rarely has anything to aggregate. The question usually arises for owners with two or more operating companies, an operating company plus a real estate entity that leases to it, or a practice with a management company.
The four requirements to aggregate
Aggregation is not available simply because you own several businesses. The regulation sets out conditions, and every one must be met.
1. Common ownership of 50% or more
The same person or group of persons must own 50% or more of each trade or business, directly or through attribution, for a majority of the taxable year, including the last day of the year. This test is the one most often misread. "Group" can include family members under attribution, which opens options for spouses and related owners, but it also means you need to map who owns what, entity by entity.
A common trap is a business where you hold 40% and a partner holds 60%. You may not meet the test unless attribution or a group brings the combined ownership to 50%. The ownership analysis also applies if you invest in real estate alongside an operating company. Investors who pair a rental entity with a business they run, or who weigh bonus depreciation rules for multifamily deals, face the same 50% common-ownership logic when they ask whether the property entity can be aggregated with anything else.
2. Same taxable year
The businesses must report all items attributable to each trade or business on returns with the same taxable year, not counting short years. A calendar-year S corporation and a fiscal-year partnership cannot be combined.
3. Each must be a real trade or business, and none can be an SSTB
Each business has to be a trade or business under Section 162 on its own. Aggregation cannot rescue an activity that does not rise to that level.
None of the businesses may be an SSTB. The Form 8995-A instructions add a point that surprises owners: if a business provides services or property to an SSTB and shares 50% or more common ownership with it, that portion of the business is treated as a separate SSTB, which generally keeps it out of an aggregation. So the practice that leases its building to your clinic through a related entity can be pulled into SSTB treatment for the rented portion.
If you are unsure whether your work is an SSTB, start with our 5 step SSTB checklist. The income side of the rule is covered in our guide to specified service trade rules above $276,750.
4. At least two of three relatedness factors
The businesses must satisfy at least two of the following:
- They provide products, property or services that are the same, or that are customarily offered together.
- They share facilities or share significant centralized business elements, such as personnel, accounting, legal, manufacturing, purchasing, human resources or information technology resources.
- They are operated in coordination with, or in reliance upon, one or more of the other businesses in the group, for example through supply chain interdependencies.
These factors are in the same regulation. The tax authorities expect real operational facts behind them, not a label. A shared bookkeeper and a shared office manager are evidence. A shared owner is not.
This is also where the common "2/7" question comes from. The aggregation regulation uses a 50% ownership test and a "two of three" factor test. It has no 2/7 figure, so if you saw that phrase, it likely came from a different tax rule or a garbled summary of the "two of three" test.
A worked example
These numbers are illustrative only and are not a prediction of your result. Assume a single filer with taxable income well above the phase-out range, so the limits apply in full. For simplicity, ignore property.
The owner holds 100% of two S corporations that are not SSTBs:
| Business A (landscaping) | Business B (equipment leasing to A) | |
|---|---|---|
| QBI | $400,000 | $150,000 |
| W-2 wages | $100,000 | $0 |
| 20% of QBI | $80,000 | $30,000 |
| 50% of W-2 wages | $50,000 | $0 |
Tested separately, Business A's deduction is limited to the lesser of $80,000 or $50,000, so $50,000. Business B gets $0 because it has no wages or property in this simplified case. The total is $50,000.
Aggregated, QBI is $550,000, so 20% is $110,000. Combined W-2 wages are $100,000, so 50% is $50,000. The limit is still $50,000. Here aggregation changes nothing because the wage cap is the binding constraint for the group. The result flips only when combined wages are high enough, or when Business B's property basis lifts the alternative limit.
Now change one fact: Business B holds $4,000,000 of qualified property basis. The alternative limit is 25% of wages plus 2.5% of UBIA, so $25,000 plus $100,000, or $125,000. Aggregated, the limit becomes the greater of $50,000 or $125,000, so the deduction is the lesser of $110,000 or $125,000, which is $110,000. That is more than double the separate-testing result of $50,000.
The lesson: run the numbers both ways before electing. Aggregation helps most when one business has the profit and another supplies the wages or the property.
How to aggregate and report it
Aggregation is not an election form. You make the choice by how you report it on your return, and the disclosure is mandatory.
- Confirm eligibility for every business: ownership, tax year, no SSTB, and two of three factors. Keep notes on the facts behind each factor.
- Model the deduction both ways, with and without aggregation.
- Choose the groups. You may aggregate some businesses and leave others out, and a business can belong to only one aggregated group.
- Attach the annual statement. Under the regulation, it must identify each aggregated business, describe it, and give the name and EIN of each entity in which it operates. The Form 8995-A instructions repeat the requirement for individuals.
- Report on Form 8995-A. Aggregated groups are a reason you will generally use the longer form rather than the simplified Form 8995. The Form 8995 instructions explain that you may choose to aggregate on the longer computation.
- Report consistently. You must carry the same aggregation into later years unless a significant change in facts and circumstances occurs.
If your S corporation or partnership also passes through its own information, make sure the entity-level reporting gives you what you need. Pass-through entities must provide the data for each business in an aggregation so the owner can combine them. Our guide to salary modeling and aggregation for S corp owners shows how reasonable compensation interacts with the wage limit.
Changing or losing an aggregation
You are not locked in forever. A significant change that makes an aggregation ineligible, such as selling part of a business, dropping below 50% ownership or discontinuing the shared functions, requires you to reapply the rules to the new facts. You can also add a newly formed or acquired business to an existing group if it qualifies.
The penalty for sloppy reporting is harsher. If you fail to attach the required statement, the IRS may disaggregate the businesses, and those businesses then cannot be aggregated for the next three taxable years, per the regulation. A forgotten attachment can cost you several years of planning.
Common aggregation mistakes
- Assuming common ownership is enough. Ownership gets you through the first gate only. The relatedness factors need real facts.
- Including an SSTB. One SSTB in the group disqualifies the aggregation, including a related entity that serves it.
- Aggregating when it does not help. If the combined wages do not improve the limit, you take on annual disclosure for no gain.
- Mismatched tax years. Different year-ends rule out aggregation.
- Forgetting the statement. The mandatory disclosure is the item most often skipped.
- Treating rentals as automatic. Rental real estate can be a trade or business, and it can be aggregated with an operating company it serves, but the Section 162 and relatedness tests still apply. For rental owners, see how the 250-hour safe harbor works.
- Overlooking shared payroll. Multi-entity owners that pay staff through one entity need the right structure to keep wage credit clean. See our guide on common paymaster rules.
Our perspective
Most owners who ask us about aggregation have the same story: two or three entities built over time, one that carries the profit, and a CPA who files each return in isolation. The entities often qualify. The paperwork is what is missing.
We treat aggregation as a modeling exercise, not a default. For every multi-entity client, we compare the deduction with and without aggregation, test it against reasonable owner compensation, and document the ownership and operational facts that support the two of three factors before the return is prepared. The statement is built into the filing process so it is never an afterthought.
We also push back on aggregation for its own sake. If the numbers show no benefit, leaving the businesses separate is simpler and carries less reporting risk. The goal is to keep more of what your businesses earn without creating something you cannot defend.
— Melissa
Getting help with an aggregation decision
If you own several businesses and your income sits above the threshold, the modeling is worth doing before you file, not after. Our Monthly Tax Advisory is $11,997 per year and our Quarterly Tax Strategy Sessions are $9,497 per year, both built for multi-entity owners who want year-round planning. If you are an S corporation owner and want a focused starting point, the S-Corp Tax Strategy Accelerator is $997 one-off. Entity returns are priced by form on our fee schedule, including Form 1120-S and Form 1065 at $1,800 each.
FAQ
What are the QBI aggregation rules?
They are the Section 199A regulation rules that let you combine multiple trades or businesses into one when applying the W-2 wage and property limits. You need 50% or more common ownership, the same tax year, no SSTBs, and two of three relatedness factors. You also must disclose the aggregation each year.
What are the aggregation rules for Form 8995?
The Form 8995 instructions say you may choose to aggregate multiple trades or businesses into a single one. Because aggregation is tied to the wage and property limits, owners who use it generally compute the deduction on Form 8995-A instead. Either way, the statement and consistency rules apply.
What is the 2/7 rule for QBI?
There is no 2/7 rule in the aggregation regulation. The nearest tests are the 50% common-ownership requirement and the requirement to meet two of three relatedness factors. If a source mentions 2/7, ask which rule it is describing before you rely on it.
Who is excluded from the QBI deduction?
SSTBs are generally excluded from qualified trades or businesses. According to the Form 8995 instructions, they are treated as qualified at or below the income threshold and partially qualified within the phase-in range. Above that range, the SSTB income generally does not qualify.
Sources
- eCFR: 26 CFR 1.199A-4, Aggregation
- The Tax Adviser: Sec. 199A and the aggregation of trades or businesses
- IRS: Instructions for Form 8995-A (2025)
- IRS: Instructions for Form 8995 (2025)
- GYF: Tax Planning Strategies, Section 199A (QBI) Deduction