Boot in a 1031 Exchange: What It Is & How to Avoid It

Boot is anything of value you receive in a 1031 exchange that isn't like-kind real property. Cash left over after closing, debt you don't replace, a car thrown into the deal, prorated rent credits — if it isn't real estate held for investment, it's boot. And boot is taxable in the year of the exchange, up to the amount of your realized gain.

The word doesn't appear anywhere in Section 1031 itself — it's old trade slang for something given "to boot," meaning in addition. But it's the single most common reason investors who thought they had a fully tax-deferred exchange end up with a surprise tax bill in April. The good news: boot is almost always avoidable, and even when it isn't, it only makes your exchange partially taxable — not blown entirely.

This guide covers the two main types of boot, the two rules that prevent it, the sneaky places it hides, and how DST investors in particular can zero it out. If you're brand new to exchanges, skim our 1031 exchange for dummies primer first — this article assumes you know the basic mechanics.

The Two Types of Boot

Boot comes in two flavors, and most investors who get burned trip over the second one because it's less intuitive.

Cash Boot

Cash boot is the easy one to understand: any exchange proceeds that end up in your pocket instead of in replacement property. It doesn't matter whether you take the cash at the sale closing, receive it mid-exchange, or get leftover funds back from your qualified intermediary after the replacement purchase closes. If the money reaches you, it's taxable.

Worked example: You sell a rental property for $1,000,000 (assume no debt and, for simplicity, no closing costs). Your qualified intermediary holds the full $1,000,000. You then buy a replacement property for $700,000. The remaining $300,000 comes back to you when the exchange closes out — and that $300,000 is cash boot, taxable up to your realized gain. If your total gain on the sale was $400,000, you'd recognize $300,000 of it now and defer only $100,000. If your total gain was $250,000, you'd recognize the full $250,000 — boot is taxable only up to the gain, never more.

Mortgage Boot (Debt Relief)

Mortgage boot is where experienced investors get caught. When you sell a property and pay off its mortgage, the IRS treats that debt relief as a benefit to you — economically, it's as if you received cash and used it to retire the loan. If your replacement property carries less debt than the property you sold, the difference is mortgage boot, taxable just like cash.

Worked example: You sell a property for $1,500,000 with a $600,000 mortgage. After payoff, your intermediary holds $900,000 in equity. You buy a replacement property for $1,300,000 using your $900,000 of equity plus a new $400,000 loan. You've spent all your cash — but you replaced $600,000 of old debt with only $400,000 of new debt. That $200,000 of net debt relief is mortgage boot, and you'll pay tax on it even though you never touched a dollar.

The fix: you can offset debt relief with fresh cash. If you added $200,000 of your own money to the purchase (buying a $1,500,000 replacement instead), the new cash neutralizes the debt shortfall and the exchange stays fully deferred. Note that it doesn't work in reverse — taking on extra debt on the replacement side does not offset cash boot you pull out.

The Twin "Equal or Greater" Rules

Everything above collapses into two simple rules. To defer 100% of your gain, your replacement property (or properties) must satisfy both:

• Equal or greater value: Buy replacement property worth at least as much as what you sold (net of qualifying closing costs). Trade down in price and the difference is boot.
• Equal or greater debt — or add cash: Carry at least as much debt on the new property as you paid off on the old one, or make up any shortfall with fresh cash from outside the exchange.

A shorthand many qualified intermediaries use: reinvest all the equity, replace all the debt. Do both and there's no boot. Miss either one and the gap is taxable — up to your realized gain. Before you go under contract on a replacement property, have your QI or CPA run these two numbers against your sale; it's a five-minute check that prevents most boot surprises.

Partial Exchanges: Taking Boot on Purpose

Boot isn't always a mistake. Some investors deliberately structure a partial 1031 exchange — deferring tax on most of the gain while pulling out a slice of cash for other purposes: paying off personal debt, funding a renovation on another property, or simply keeping liquidity after years of being equity-rich and cash-poor.

The math is straightforward: you pay tax on the boot you take, and you defer the rest. Sell for $1,000,000 with a $400,000 gain, reinvest $850,000, and keep $150,000? You recognize $150,000 of gain now and defer $250,000. Critically, receiving boot doesn't invalidate the exchange — a partial exchange is still a valid exchange for the portion you reinvest. That's very different from a failed 1031 exchange, where the whole gain comes due.

When is intentional boot smart? Generally when the cash you need is small relative to the gain you're deferring, or when you have losses or low-bracket years to absorb the recognized gain. When is it not? When you're in a high bracket, in a state that piles its own tax on top, or when the boot is mostly depreciation recapture taxed at up to 25% — that's expensive cash. One important structural note: arrange the cash-out through your qualified intermediary at closing, as part of the exchange documents. Model both paths with your CPA before closing, not after.

Sneaky Boot: Where It Hides in Closing Statements

Big boot is easy to see coming. What catches careful investors is small boot buried in the settlement statement. Common culprits:

• Non-exchange expenses paid from proceeds: Exchange proceeds can generally cover transactional costs like brokerage commissions, title and escrow fees, and QI fees without creating boot. But items such as loan fees on the new mortgage, prepaid property insurance, or utility deposits paid out of proceeds are commonly treated as boot. Pay those from your own pocket instead.
• Prorated rents and security deposits: Credits you receive at closing for rent the tenant prepaid, or security deposits transferred to you as the seller, are cash-equivalent benefits — potential boot if netted against proceeds.
• Seller concessions and repair credits: A credit from your buyer for repairs, or a concession you receive on the replacement purchase that effectively reduces what you paid, can shave the numbers in ways that create small taxable gaps.
• Personal property in the deal: Since the 2017 tax law, only real property qualifies for 1031 treatment. Furniture, equipment, or vehicles included in either sale can generate boot.
• Earnest money paid outside the exchange, reimbursed at closing: If you front a deposit personally and get it back from exchange funds, the reimbursement can be treated as cash to you. Route deposits through your QI instead.

The rules on which closing costs are "exchange expenses" versus boot have gray areas, so have your QI and CPA review both settlement statements line by line before closing. A $6,000 boot surprise won't ruin you, but it's an annoying tax bill for something a ten-minute review would have caught. The IRS Form 8824 you file with your return is where all of this gets reported and reconciled.

How DSTs Eliminate Leftover-Cash Boot

Here's a structural problem with traditional exchanges: real buildings come in fixed sizes. If you sell for $1,000,000 and the best replacement you can find costs $920,000, you're either taking $80,000 of boot or scrambling to buy a second property inside your 180-day window just to soak up the remainder.

Delaware Statutory Trusts don't have that problem. Because a DST sells fractional interests, you can invest your exact remaining proceeds to the dollar — $80,000, $47,312, whatever the leftover is — subject to the offering's minimum, which for exchange investors is typically $100,000 as a primary investment but often lower when a DST is used as a "cover" for leftover proceeds alongside another purchase. See our guide to DST minimum investments for the details.

This is why many advisors pair a direct property purchase with a DST remainder: the building takes the bulk of the proceeds, and the DST absorbs whatever's left so nothing comes back from the QI as taxable cash. It's one of the cleaner plays in the broader DST 1031 strategy toolkit.

How DSTs Solve the Debt-Replacement Problem

Mortgage boot has a DST answer too. Every DST offering comes with a fixed loan-to-value ratio, and when you buy an interest, you're credited with your proportional share of the trust's debt for exchange purposes — without signing a personal guarantee, submitting to underwriting, or qualifying for a loan.

That matters if you sold a highly leveraged property. Suppose you sold with 70% debt and your replacement options are all-cash DSTs at 0% leverage — you'd have a huge mortgage boot problem. Instead, you can allocate part of your proceeds to a high-LTV DST. Zero-coupon DSTs (offerings where all cash flow goes to paying down the loan rather than distributions) commonly run 75% to 90% LTV, so a relatively small allocation can replace a large amount of debt. Blend a zero-coupon position with lower-leverage income DSTs and you can match your old debt level almost exactly.

The trade-offs: zero-coupon DSTs pay little or no current income, and high leverage amplifies both outcomes at sale. They're a debt-matching tool, not an income play — worth understanding alongside the other DST pros and cons and the fee load of any offering you're considering.

How Boot Is Taxed

Boot doesn't get its own special rate — it causes you to recognize gain you would otherwise have deferred, and that gain keeps its character. The ordering matters:

• Depreciation recapture first: Recognized gain is treated as unrecaptured Section 1250 gain to the extent of your prior depreciation deductions, taxed at up to 25%.
• Long-term capital gains next: Gain beyond the recapture layer is taxed at long-term capital gains rates — 15% or 20% for most sellers, depending on income.
• Net investment income tax on top: The 3.8% NIIT applies to the recognized gain if your income exceeds the thresholds.
• State tax: Your state generally taxes the recognized gain too — and if you're exchanging out of California, its clawback rules add another wrinkle.

This ordering is why "just a little boot" can be pricier than expected: the first dollars of recognized gain are often the recapture dollars taxed at up to 25%, not the 15% you might have penciled in. To see what a given amount of boot would actually cost you, run your numbers through our capital gains tax calculator — then confirm the result with your CPA, since basis and depreciation histories vary.

Conclusion

Boot is the gap between a fully deferred exchange and a partially taxable one. Cash you keep is boot. Debt you don't replace is boot. Small closing-statement items can be boot. None of it invalidates your exchange — but all of it is taxable up to your realized gain, with depreciation recapture at up to 25% eating the first dollars. The defense is simple: buy equal or greater value, replace equal or greater debt (or add cash), route every dollar through your qualified intermediary, and review both closing statements with your QI and CPA before you sign. And if fixed-size buildings make exact reinvestment impossible, DST fractional interests and high-LTV offerings let you match your numbers to the dollar.

Avoiding boot is only half the battle — you also have to find and close your replacement property on the IRS's clock. See our guide to the 1031 exchange timeline for how the 45-day and 180-day deadlines work and how to plan around them.