Cost Segregation: Rental Properties

Your rental property could significantly reduce what you owe the IRS this year. Most owners have no idea this is legal.

Here's the part nobody explains well:

Normal rental losses are "passive." They can only offset other passive income, not your W-2 paycheck or your 1099/business income. That's the rule most people run into and give up on.

Short-term rentals can work differently.

If the average length of stay works out to 7 days or less across the year, the activity isn't automatically treated as a "rental activity" under the passive-loss rules. That's the exception, but it doesn't automatically make your losses usable.

You still have to clear a material participation test, real and documented, not just hiring a manager and checking in occasionally. The IRS tests include things like more than 500 hours in the activity during the year, or more than 100 hours and more than anyone else involved.

Clear that bar, and losses from the property, including accelerated depreciation from a cost segregation study, can be used against active income like wages or business income, instead of being stuck offsetting only other rental income.

The depreciation piece: instead of writing off the entire building over 27.5 years, a cost segregation study identifies components that qualify for faster schedules (5, 7, and 15 years). The share of the property that gets reclassified this way is often in the 20 to 30% range, though it varies a lot by property type and how it's furnished. Under current law, a meaningful part of that can be deducted in year one.

A few things this isn't:

It isn't automatic. Basis limits, at-risk rules, and other limitations can all restrict how much of the loss you actually get to use in a given year.

It isn't limited to short-term rentals only. Long-term rental owners don't qualify for this specific 7-day exception, but they have other paths to nonpassive treatment, like real estate professional status or the $25,000 special allowance.

It isn't free money forever. Accelerating depreciation now generally means less depreciation, and potentially more taxable gain, later if you sell. Part of the benefit is timing, not a permanent write-off.

It isn't a project to run without help. There's no legal requirement to use a cost segregation firm, but a well-documented, engineering-based study is far more defensible if the IRS looks closely, and they do look closely at this strategy.

If you own a short-term rental (or you're weighing one against a long-term rental), this is worth a real conversation with your tax advisor. The details of your specific situation determine whether any of this actually applies.

Comment if you've used this strategy, drop a question if you're not sure it applies to you, or shoot us a DM to talk it through privately.