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1031 Exchange Basics for Real Estate Investors (and How It Works with Cost Segregation)

A 1031 exchange lets you defer taxes when you sell investment property and buy another. Learn the 45- and 180-day rules, boot, and how cost segregation fits in.

Guide 29 of 35Cluster guide6 min readOctober 2026
Quick answer

A 1031 exchange lets you sell investment or business real estate and defer capital gains and depreciation recapture taxes by reinvesting the proceeds into other "like-kind" real estate. You must identify replacement property within 45 days and close within 180 days, and a qualified intermediary must hold the cash. Since 2018, only real property qualifies.

This content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.

How a 1031 exchange works

Normally, when you sell a rental property for a profit, you pay tax on the gain and on depreciation you've taken. A 1031 exchange, named after Section 1031 of the tax code, lets you defer that tax if you roll the value into new investment real estate.

Defer is the key word. The tax isn't erased. It carries into the new property through a lower tax basis.

The core rules

RuleWhat it means
Like-kind real propertyBoth properties must be real estate held for investment or business use. A rental can be exchanged for land, an office, or an apartment building.
Not personal useYour primary home and property held mainly for resale (like flips) don't qualify.
45-day identificationYou must identify possible replacement properties in writing within 45 days of selling.
180-day closingYou must close on the replacement within 180 days of the sale, or by your tax return due date (with extensions) if earlier.
Qualified intermediaryA third party must hold the sale proceeds. If you touch the money, the exchange fails.
Equal or greater valueTo defer all the tax, buy property of equal or greater value and reinvest all the cash.
Same taxpayerThe person or entity that sells must be the one that buys.

What is "boot"?

Boot is anything you receive that isn't like-kind property, such as leftover cash or debt relief that isn't replaced. Boot is taxable. A partial exchange still works, but you'll owe tax on the boot.

Identification rules for replacement property

Most investors use one of these:

  • Three-property rule: identify up to three properties of any value
  • 200% rule: identify any number of properties, as long as their total value is no more than 200% of what you sold

How 1031 exchanges and cost segregation work together

These two strategies are often paired, but there's an important wrinkle.

  • The upside: A cost segregation study on your replacement property can create new depreciation, especially on any extra basis from added cash or debt.
  • The wrinkle: Since 2018, only real property qualifies for a 1031 exchange. The 5- and 7-year personal property identified in a cost segregation study generally isn't like-kind real property. When you exchange a property that had a cost segregation study, the value allocated to those personal property items may trigger depreciation recapture as ordinary income, unless it's offset by similar property in the replacement.

This doesn't make the combination a bad idea. It just means you and your CPA should plan the sale allocation and the replacement purchase together.

Common 1031 mistakes

  • Missing the 45- or 180-day deadlines (there are very few extensions)
  • Receiving the sale proceeds directly instead of through a qualified intermediary
  • Buying a cheaper replacement and creating taxable boot
  • Changing the taxpayer, such as selling as an LLC and buying personally
  • Forgetting about state tax rules

Frequently asked questions

Can I 1031 exchange into a short-term rental?
Often yes, if it's held for investment and meets the use requirements. Mixed personal and rental use has extra rules.
Can I do a 1031 exchange forever?
Yes. Many investors exchange repeatedly. If you hold until death, your heirs generally receive a stepped-up basis.
Does a 1031 exchange avoid depreciation recapture?
It defers it on the real property portion. Personal property identified through cost segregation needs separate planning.

See what your property may qualify for

Run our 2-minute STR Qualification Quiz or model your Low / Mid / High cost segregation range.

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This content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.