🇺🇸 Made in America·100% U.S.-Based Team · 24+ Years in Cost Segregation
The grouping election lets you treat several activities as a single activity for the passive activity loss rules, so your participation is measured across the combined group instead of property by property. For cost segregation, that can be the difference between losses you can actually use and losses that sit stranded as carryforwards. It is powerful, but it is technical, hard to reverse, and carries real tradeoffs, which is why it is genuinely your CPA's decision. Your job is to recognize when it might matter and raise it.
A dentist named Olivia in Bristol, Virginia, owned three rental properties on top of her practice building. She had done cost segregation on all of them and was sitting on a pile of paper losses she could not use, because each property was treated as its own separate activity and none of them, alone, met the participation tests that would have made the losses usable. The deductions were real. They were just stranded, scattered across four separate buckets.
Her new CPA looked at the situation for about ten minutes and said one word that changed her tax picture. "Grouping."
By electing to group her rental activities together and treat them as a single activity, Olivia could measure her participation across all of them combined instead of one at a time. Suddenly the participation that was too thin in any single property was more than enough across the group. The stranded losses came loose.
The grouping election is one of the most powerful tools in real estate tax, and one of the most misunderstood. This article explains what it does, when it helps, and why it is genuinely your CPA's decision to make. Fair warning up front: this is technical territory, and the goal here is to help you recognize when grouping might matter, not to do it yourself.
To understand grouping, you have to understand the problem it solves: the passive activity loss rules.
The tax code generally treats rental real estate as a passive activity. Passive losses can usually only offset passive income, not your wages or your active business income. A cost segregation study produces large losses, and if those losses are passive and you do not have passive income to absorb them, they sit stranded, carrying forward to a future year.
There are ways out of the passive box. Several of them depend on how much you participate in the activity, through material participation tests or real estate professional status. The catch is that these tests are applied to an activity. And here is the trap Olivia fell into: by default, each rental property can be treated as its own separate activity. So your participation gets measured property by property. You might spend plenty of time across your whole portfolio, but if it is sliced into separate activities, no single slice clears the bar.
That is the problem. Real participation, spread across several properties, failing the tests because it is measured one property at a time instead of all together.
The tax rules allow you to group multiple activities together and treat them as a single activity, when they constitute an appropriate economic unit.
When you group your rental properties into one activity, the participation tests are applied to the combined group, not to each property separately. The time and involvement you spread across all the properties now counts toward one set of tests instead of being diluted across several.
For Olivia, this was the whole game. Individually, her participation in any one rental was modest. Combined across all three rentals as a single grouped activity, her participation was substantial, enough to change the character of the losses and let them come loose from the passive box. Same properties, same hours, same losses. The grouping changed how they were measured, and that changed everything.
This is why grouping is so powerful for cost segregation. Cost segregation creates the large losses. Grouping can be the mechanism that makes those losses usable, by letting your participation count where it otherwise would not.
Here is where precision matters, and where a lot of confusion lives. People use "grouping election" loosely to mean several different things, and they are not the same.
There is the general grouping of activities into appropriate economic units, which affects how the passive activity tests apply across your holdings. And separately, there is a specific aggregation election available to taxpayers who qualify as real estate professionals, which lets them treat all their rental real estate as a single activity for the material participation test. These are distinct mechanisms with distinct rules, and they serve overlapping but different purposes.
The reason this matters to you is not so you can sort out which is which on your own. It is so you understand why you must not treat this as a do-it-yourself project off a blog post. The mechanisms are technical, the elections have specific requirements and documentation, and choosing and executing the right one is squarely your CPA's job. What you need to recognize is the pattern: stranded losses across multiple properties, real participation that is being measured the wrong way, and the possibility that grouping or aggregation fixes it. Then you raise it with your CPA.
A responsible discussion of grouping has to include the warning. Grouping is not a free lever you can pull and reverse whenever convenient.
Once you group activities, you generally cannot regroup them freely. The election is meant to be consistent year to year, and changing it later is restricted. This means grouping is a decision with downstream consequences, not just an upside.
Why does that matter? Because grouping that helps you in one situation can hurt you in another. For example, grouping affects not just whether losses are usable, but how things are treated when you dispose of a property. If properties are grouped, the rules around recognizing suspended losses on the sale of one property can be affected, because the activity is the group, not the single property. There are real tradeoffs.
This is the heart of why grouping is misunderstood. People hear it frees up losses and treat it as a magic switch. It is not. It is a strategic election with benefits and costs that depend on your full picture, your participation, your portfolio, your plans to buy and sell, and your other income. The right answer for Olivia might be the wrong answer for someone else with an identical-looking portfolio but different plans.
Cost segregation and grouping are complementary, and understanding the relationship helps you see why both matter.
Cost segregation is the engine that creates the large depreciation losses. Without it, your properties depreciate slowly and there are no big losses to worry about using. Cost segregation front-loads the deductions, which is exactly what you want, but it also raises the question that grouping answers: can you actually use these losses this year?
For a single-property owner who materially participates, the answer may be straightforward. For someone like Olivia, with several properties and participation spread across them, the answer depends heavily on how the activities are structured and grouped. The cost segregation study makes the losses. The grouping analysis determines whether they are usable now or stranded as carryforwards.
This is why the Cost Seg America team raises the usability question as part of the conversation, not after the study is done. The engineered study produces the deduction. Whether grouping helps you use it is a question for you and your CPA, and it is far better answered before you build a pile of losses you then discover you cannot touch.
The misunderstandings here are costly. Watch for these.
Treating grouping as a DIY move off an article. The biggest mistake. The mechanisms are technical and the elections have specific requirements. This is your CPA's job to execute and document.
Assuming grouping is always favorable. It helps in some situations and hurts in others, especially around how suspended losses are treated when you sell. The right answer depends on your full picture.
Confusing general grouping with the real estate professional aggregation election. They are distinct mechanisms with distinct rules. Which applies, if any, is a professional determination.
Building a pile of losses first, then asking if they are usable. Raise the grouping question before the studies create stranded losses, not after.
Olivia's situation is the cautionary tale. She did everything right on the cost segregation side. Three studies, large legitimate losses, real deductions earned. And she sat on them, unusable, because her prior advisor never raised grouping and measured her participation property by property.
Run the rough cost. Say her three studies produced combined first-year losses of around $400,000, sitting as suspended passive losses she could not use against her practice income. At her bracket, the time value of having that $400,000 of deductions stranded for years, rather than usable now, was a large and entirely avoidable cost. The deductions were not lost forever. They were frozen, and freezing a deduction for several years is expensive in present-value terms even when you eventually thaw it.
Keith Cunningham's discipline applies. The deductions looked fine on paper. The problem was invisible, buried in how the activities were structured, the kind of thing nobody sees unless they know to look. The tool that fixed it cost Olivia a conversation with a CPA who recognized the pattern. Not knowing the tool existed cost her years of frozen deductions.
You are not going to execute a grouping election off this article, and you should not try. What you should do is recognize the pattern and raise it.
If you own multiple rental properties, you have done cost segregation or are considering it, and you suspect your losses are stranded or your participation is being measured property by property, grouping or aggregation may be the missing piece. That is the signal to have a focused conversation with your CPA about whether grouping helps your specific situation, and at what cost.
On the cost segregation side, the Cost Seg America team builds the engineered studies that create the deductions and raises the usability question so you and your CPA can address it before, not after. The free proposal is where the deduction side starts. The grouping decision belongs with your CPA, informed by your full picture.
The grouping election is powerful, technical, and easy to misunderstand. Treat it with the respect it deserves. Recognize when it might matter, and then put it in the hands of the professional whose job it is to get it right.
What is the grouping election?
It is a tax election that lets you treat multiple activities as a single activity for passive activity loss purposes, when they form an appropriate economic unit. This changes how participation tests are applied, measuring your involvement across the combined group rather than property by property.
How does grouping help with cost segregation losses?
Cost segregation creates large losses. If those losses are stranded because your participation is measured separately for each property and none clears the tests alone, grouping can let your combined participation count, potentially making the losses usable rather than suspended.
Is grouping the same as the real estate professional election?
No. General grouping of activities and the specific aggregation election available to qualifying real estate professionals are distinct mechanisms with different rules. Which one applies, if any, depends on your situation and is your CPA's determination.
Can I undo a grouping election?
Generally not freely. Grouping is meant to be consistent year to year, and regrouping is restricted. It is a strategic decision with downstream consequences, including effects on how suspended losses are treated when you sell a property, so it should be made carefully with your CPA.
When should I raise grouping with my CPA?
Before your cost segregation studies create a pile of stranded losses. Planning the grouping question in advance is far better than discovering afterward that your losses are frozen.
Who decides whether to group?
Your CPA, based on your full tax picture. The Cost Seg America team builds the engineered studies that create the deductions and flags the usability question. Request a free proposal, or reach out to the Cost Seg America team directly:
1-888-365-5023
info@costsegamerica.com
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