1031 Exchange Boot: Cash, Mortgage, and How to Avoid It
The word "boot" sounds quaint but its tax consequences are real. Boot is any non-like-kind value you receive in a 1031 exchange — and it's taxable even if the rest of your exchange qualifies. Here's exactly what boot is, the three forms it takes, and how to structure your exchange so boot doesn't surprise you.
What is boot?
In a 1031 exchange, "boot" refers to any non-like-kind value you receive in addition to the replacement real estate. The IRS allows you to defer tax on the exchange portion but taxes you on any boot received.
Three types of boot:
- Cash boot. Cash you walk away with — sale price higher than replacement price, and you don't reinvest the difference.
- Mortgage boot. Debt reduction — old mortgage higher than new mortgage, and you don't offset with fresh cash.
- Other property boot. Non-like-kind property received as part of the trade (personal property, cash-equivalent assets).
Boot is taxable up to the amount of realized gain. Beyond the gain, boot just becomes a return of basis.
Cash boot — the obvious one
Example: You sell for $1M, buy a replacement for $800k. That $200k difference is cash boot. It's taxable on the year of the exchange at your long-term capital gains rate + depreciation recapture applied proportionally.
Why would anyone do this? Sometimes intentionally — you want to cash out a portion while deferring the rest. This is called a partial 1031 exchange. It's fully legal; you just pay tax on the boot portion and defer everything else.
Mortgage boot — the less obvious one
Mortgage boot is the one that surprises investors. Example: you sell a property with a $500k mortgage. You buy a replacement for $1M with a $400k mortgage. You're $100k net out of debt.
From the IRS's perspective, that debt reduction is equivalent to cash boot. You didn't pay the $100k to anyone — the debt just reduced. But the tax treatment is the same: $100k of taxable boot.
The way out: offset debt reduction with fresh cash brought into the deal. If you put $100k of additional cash into the replacement's purchase price (not from the exchange proceeds — from your own pocket), that fresh cash offsets the mortgage reduction and there's no boot.
Other property boot
If the seller of your replacement property throws in personal property (appliances, furniture in a furnished rental, equipment) that's "other property boot." Rare but worth knowing about, especially for furnished vacation rentals.
Since 2017, personal property exchanges no longer qualify for 1031 at all. So if appliances or furnishings are part of the deal, their value is boot.
The equal-or-greater rule (how to avoid boot)
To defer 100% of your gain with zero boot, the replacement must meet all three of these:
- Equal or greater purchase price (compared to relinquished net sale price)
- Equal or greater equity
- Equal or greater debt (or offset with fresh cash)
Fall short on any one and you have boot of some kind.
A quick test: if you're not putting at least as much net equity into the replacement as you took out of the sale, you have boot. If you're taking on less debt than you had, you have mortgage boot (unless offset with cash). Both tests must pass.
When partial boot makes sense
Sometimes you want to take some boot intentionally. Common scenarios:
- You want to cash out a portion of your equity for personal use and are willing to pay tax on that piece only
- You're scaling down your real estate portfolio and transitioning some equity out
- You need liquidity and the tax on the boot is less painful than borrowing against the replacement
The key is modeling the boot tax against your alternatives. On our 1031 exchange calculator you can enter your replacement value and see the boot scenario — what you'd owe on a partial exchange — before you commit.
Structuring an exchange and worried about boot?
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