The short answer
Reg. section 1.469-4 lets you treat two or more rental or business activities as a single activity if they form an appropriate economic unit, judged by the type of business, common control, common ownership, geography and interdependence. Grouping helps you reach material participation and the 10 percent ownership test once for the whole group, but it has a price: selling one property out of a group is a partial disposition that releases none of the suspended losses, and the grouping cannot be undone unless it was clearly inappropriate or the facts materially change. New groupings, additions and regroupings must be disclosed under Rev. Proc. 2010-13 or each activity is treated as separate. A real estate professional's election to treat all rental real estate as one activity is a different election with its own rules.
At a glance
| The test | An appropriate economic unit, weighing type of business, common control, common ownership, geographic location and interdependence |
|---|---|
| Rentals and businesses | May be grouped only if one is insubstantial relative to the other or every owner holds the same proportionate interest in both |
| Real and personal property | A real property rental and a personal property rental may never be one activity |
| Disclosure | A statement with the original return for every new grouping, addition or regrouping, with names, addresses, EINs and a declaration |
| No statement | Each activity is treated as separate, unless you filed consistently and disclose when you discover the miss |
| Regrouping | Barred unless the original grouping was clearly inappropriate or a material change in facts makes it so |
| Partial sales | Selling one property from a group releases no suspended losses unless it is substantially all of the activity and its losses can be traced |
| Professionals | The Reg. section 1.469-9(g) aggregation election is separate, binding and outside the Rev. Proc. 2010-13 regime |
Grouping decides what counts as one activity, and that single decision drives three tests
Publication 925 lays out why the definition of an activity matters. If you group two activities into one, you need only show material participation in the activity as a whole; if they are separate, you must show it in each. Grouping also affects whether you meet the 10 percent ownership requirement for the $25,000 allowance described on the rental loss allowance page.
The third test cuts the other way. If two activities are grouped and you dispose of one, you have disposed of only part of your interest in the activity, and section 469(g) releases suspended losses only on the disposition of your entire interest. If they are separate and you sell one, you have disposed of your entire interest in that activity and the losses attached to it come free.
So the question is never whether grouping is good. It is whether the hours problem today outweighs the exit problem later, and the answer usually depends on which property you expect to sell first.
The appropriate economic unit test and the limits on mixing rentals with businesses
Reg. section 1.469-4(c) allows one or more trade or business activities or rental activities to be treated as a single activity if they constitute an appropriate economic unit for the measurement of gain or loss. The call depends on all the facts and circumstances, with the greatest weight on five factors: similarities and differences in the types of businesses, the extent of common control, the extent of common ownership, geographical location, and interdependencies such as shared customers, employees or books. Not every factor has to apply.
Rentals and operating businesses are kept apart by Reg. section 1.469-4(d)(1). A rental activity may be grouped with a trade or business activity only if they form an appropriate economic unit and either the rental is insubstantial in relation to the business, the business is insubstantial in relation to the rental, or each owner of the business has the same proportionate ownership interest in the rental. Reg. section 1.469-4(d)(2) adds that a real property rental and a personal property rental may not be a single activity, and Reg. section 1.469-4(d)(5) requires a partnership or S corporation to group at the entity level, after which a partner may combine but not split those groupings.
Within those limits the regulation leaves room: several single-family rentals in one metropolitan area under one owner and one bookkeeper are a plausible unit; a warehouse in another state held through a different LLC with a different partner is a harder case. Reg. section 1.469-4(f) lets the Commissioner regroup if a grouping is not an appropriate economic unit and a principal purpose was to circumvent section 469.
Disclose it or lose it: the Rev. Proc. 2010-13 statement
Rev. Proc. 2010-13 applies to tax years beginning on or after January 25, 2010. Section 4.02 requires a written statement with the original return for the first year in which two or more activities are grouped, identifying the names, addresses and employer identification numbers of the activities and declaring that they constitute an appropriate economic unit. Section 4.03 requires a similar statement when a new activity is added to an existing group, and section 4.04 when activities are regrouped, with an explanation of why the original grouping was clearly inappropriate or what material change occurred.
Section 4.07 states the consequence of silence: a taxpayer with two or more activities who fails to report whether they are grouped has each one treated as a separate activity. The same section offers relief: a disclosure is deemed timely if you filed every affected return consistently with the claimed grouping and make the disclosure on the return for the year you first discover the omission; if the IRS discovers it first you also need reasonable cause. Section 4.06 exempts groupings made before the effective date until you change them, and section 4.05 lets partnerships and S corporations disclose through their Schedules K-1 instead.
The revenue procedure does not reach the rental real estate of a real estate professional who has made the aggregation election under Reg. section 1.469-9(g). That election has its own statement, its own binding effect and its own late-election relief, all described on real estate professional status: the two tests and the election.
The disposition trap: a sale from inside a group releases nothing unless the losses can be traced
Section 469(g)(1)(A) frees suspended losses only when you dispose of your entire interest in the activity in a fully taxable transaction. Reg. section 1.469-4(g) gives one escape for a disposition of substantially all of an activity: you may treat the part disposed of as a separate activity, but only if you can establish with reasonable certainty the amount of carried-over deductions and credits allocable to that part and the amount of its gross income and other deductions for the year. Publication 925 restates the test as proving the prior-year unallowed losses and the current-year income or loss allocable to the part disposed of.
A hypothetical with round figures: three rentals grouped as one activity carry $60,000 of suspended losses, and you sell the smallest for a $150,000 gain in a taxable sale. The sale is a partial disposition. The gain is passive income and absorbs $60,000 of the suspended losses, but nothing is released against your wages, and if the gain had been only $20,000 the other $40,000 would stay suspended. Had the three been separate activities with $20,000 attached to the sold building, that $20,000 would have been released in full. Run your own numbers with your CPA.
Tracing is the practical answer. Keep Form 8582 worksheets by property even inside a group, so that if a sale is substantially all of the activity you can meet the reasonable-certainty standard. The release rules for related buyers, installment sales, gifts and death are on the passive activity loss rules page.
Regrouping and revocation are both hard, and DST interests add a new wrinkle
Reg. section 1.469-4(e)(1) says that once you have grouped activities you may not regroup them in later years, and Reg. section 1.469-4(e)(2) requires a regrouping only if the original grouping was clearly inappropriate or a material change in the facts and circumstances makes it so. Buying a fourth rental does not reopen the grouping of the first three; it raises the question of whether the new one is added. Revoking a professional's aggregation election is similarly limited to a year of material change under Reg. section 1.469-9(g).
A Delaware statutory trust interest is, for income tax purposes, an undivided interest in the trust's rental real estate under Rev. Rul. 2004-86, so it is rental real estate in your hands. A professional's aggregation election covers all interests in rental real estate, which sweeps DST interests into the single activity while adding no hours to it; an ordinary grouping of DST interests with directly managed rentals would have to pass the economic unit factors with no common control. Neither outcome is addressed in published guidance.
What is clear is the carryover. When a grouped property is exchanged into a DST, the suspended losses are not released and are reallocated to the activities that continue the loss activity, including the DST interest, as explained in suspended passive losses in a 1031 exchange and passive losses and a DST sale. For an owner who wants out of all three buildings, exchanging each into the traditional DST exchange solutions keeps the group's losses usable against DST income rather than stranding them.
Related questions
How is grouping different from the real estate professional's election?
Grouping under Reg. section 1.469-4 is available to any taxpayer and depends on an appropriate economic unit, with disclosure under Rev. Proc. 2010-13. The Reg. section 1.469-9(g) election is only for qualifying professionals, covers all rental real estate automatically and is outside that disclosure regime.
Do I have to disclose a grouping I made before 2010?
No. Section 4.06 of Rev. Proc. 2010-13 requires a statement for a pre-existing grouping only when you add an activity to it or regroup.
Can I group my rental with the business that rents it from me?
Only if they form an appropriate economic unit and either activity is insubstantial relative to the other or every owner of the business holds the same proportionate interest in the rental, under Reg. section 1.469-4(d)(1).
If I sell every property in the group in one year, are the losses released?
Yes. Disposing of all of them in fully taxable sales to unrelated buyers is a disposition of your entire interest in the activity, and section 469(g) releases the suspended losses.
Can I split activities that a partnership grouped together?
No. Reg. section 1.469-4(d)(5) lets a partner group the entity's activities with other activities but not treat activities the entity grouped as separate.
Sources
Checked against these publications on September 30, 2026. Rules and figures change; confirm the current version with your CPA or attorney before you act. This page is general information, not tax or legal advice.
- Reg. section 1.469-4, Definition of activity
- IRS, Rev. Proc. 2010-13 (disclosure of groupings under section 469)
- 26 U.S.C. section 469, Passive activity losses and credits limited
- Reg. section 1.469-9, Rules for certain rental real estate activities
- IRS, Publication 925, Passive Activity and At-Risk Rules (2025)
- IRS, Rev. Rul. 2004-86 (Delaware statutory trust interests as real property)