Cash boot is the most straightforward form of taxable gain in a 1031 exchange. It occurs whenever an investor receives "unlike-kind" property—usually in the form of actual currency—at the conclusion of the exchange . This often happens during "Step 4" of the process, where the investor decides how much of the sale proceeds will be reinvested . While the goal is usually 100% reinvestment, some investors choose to take a "partial" exchange.

Scenarios Triggering Cash Boot

The "Pocket Change" Error: An investor sells a property for $500,000 and buys a replacement for $495,000. The remaining $5,000 held by the Qualified Intermediary is returned to the investor. That $5,000 is cash boot and is fully taxable .
The Repair Trap: An investor asks the QI to release $10,000 from the exchange account to pay for immediate repairs on the new property. Because those funds were received by the investor (or used for their benefit outside of the purchase price), they are considered boot .
Non-Qualified Expenses: Using exchange funds to pay for items that aren't considered "closing costs" (like prorated rent or utility deposits) can result in cash boot.

The Math of Cash Boot

Transaction Component	Amount	Tax Status
Net Sale Price (Relinquished)	$1,000,000	-
Purchase Price (Replacement)	$950,000	-
Cash Remaining (Boot)	$50,000	Taxable at Capital Gains Rate
Deferred Gain	$950,000	Tax-Deferred

Mortgage Boot: The Hidden Debt Trap

Mortgage boot, also known as "debt relief," is far more insidious than cash boot because it doesn't involve a check. It occurs when the debt on the replacement property is lower than the debt on the relinquished property . The IRS views a reduction in your liabilities as a financial benefit—essentially, the government "paid off" part of your debt using the untaxed proceeds of your sale.

The "Equal or Greater" Debt Requirement

To avoid mortgage boot, you must follow a simple rule: the new mortgage must be equal to or greater than the old mortgage . If you want to take out a smaller mortgage, you must make up the difference by adding your own cash (outside capital) into the deal. You cannot simply "downsize" your debt without tax consequences.

Example: The $100,000 Liability Gap

Consider an investor who sells a property with a $1,000,000 mortgage. They find a beautiful replacement property but only take out a $900,000 mortgage because they want a lower monthly payment. Even if they reinvest all their equity, that $100,000 difference in debt is treated as "income" and is taxed accordingly .

Offsetting Boot: The Balancing Act

It is possible to offset certain types of boot, but the rules are one-way. You can offset a reduction in debt by adding more cash to the purchase of the replacement property. However, you cannot offset a receipt of cash by taking on more debt .

The Offset Rulebook

Debt Reduction? Offset it by adding cash.
Cash Received? Cannot be offset by more debt.
Closing Costs? Certain "exchange expenses" (like commissions and title fees) can be used to reduce the total amount of boot .

FAQ: Common Boot Questions

Q: Can I use the exchange funds to pay for my moving truck?
A: No. Moving expenses are not considered part of the real estate acquisition. If the QI pays for your moving truck, that amount is considered taxable boot .

Q: What if the buyer of my old property gives me their lawnmower as part of the deal?
A: A lawnmower is personal property, not "like-kind" real estate. The fair market value of that lawnmower would be considered "boot" and would be taxable .

Q: Is boot taxed as ordinary income or capital gains?
A: Generally, boot is taxed at capital gains rates (15% or 20%), but if "depreciation recapture" is triggered, it could be taxed at higher ordinary income rates up to 25% .

Depreciation Recapture: The Silent Tax

One of the most complex pitfalls related to boot is "depreciation recapture." Over the years of owning a property, investors take depreciation deductions to lower their taxable income . When you sell, the IRS wants that money back. In a 1031 exchange, this recapture is deferred—unless you receive boot or exchange into a property that doesn't allow for the same depreciation treatment (like exchanging a building for raw land) . If you exchange improved land (with a building) for unimproved land (just dirt), the depreciation you claimed on the building is "recaptured" and taxed as ordinary income immediately, even if you didn't receive any cash .