A 1031 exchange defers capital gains tax; it does not eliminate it, and boot is the mechanism that determines how much of the deferral actually holds. Boot is any value an exchanger receives from the transaction that is not like-kind real property, and it is taxable in the year of the exchange up to the amount of realized gain, even though the rest of the exchange proceeds remain deferred.
Exchangers across North Carolina sometimes assume that using a qualified intermediary and closing on a replacement property automatically defers all gain. It does not, if the replacement purchase is smaller in price or carries less debt than the property that was sold.
Mortgage boot
Mortgage boot, sometimes called debt-relief boot, does not involve cash at all, which is exactly why North Carolina exchangers overlook it. It shows up whenever the mortgage balance paid off at the relinquished closing is bigger than the new loan taken out on the replacement side. Reducing debt is itself treated as receiving value, since the exchanger's overall liabilities went down as part of the transaction.
An exchanger selling a property with a $600,000 mortgage who buys a replacement with only a $400,000 mortgage has created $200,000 of mortgage boot, even if every dollar of sale proceeds went into the new purchase. Bringing additional cash to the closing to offset that debt reduction is one way to avoid triggering it, but cash used to offset mortgage boot cannot come from the exchange proceeds without recreating a cash boot problem.
Cash boot
Cash boot is the most direct form: any exchange proceeds that end up in the exchanger's hands rather than being reinvested into the replacement property. This happens when the replacement property costs less than the relinquished property sold for, leaving leftover funds with the qualified intermediary that eventually get distributed to the exchanger. It can also happen indirectly, through funds used for a purpose the IRS does not treat as a qualifying exchange expense, such as paying down an unrelated debt from exchange funds.
Avoiding cash boot generally means the replacement property, or combination of replacement properties, has to be purchased at a price equal to or greater than the net sale price of the relinquished property.
Boot from both directions can offset, but only one way
Cash boot and mortgage boot can offset each other, but only in one direction: extra cash brought to a closing can offset a debt-relief shortfall, but a larger new mortgage cannot offset cash taken out of the deal. An exchanger who pulls $50,000 in cash and increases the replacement mortgage by $50,000 has still triggered $50,000 of taxable boot, because the two categories are not fungible against each other in that direction.
Why the equal-or-greater rule matters most
The general guideline for avoiding boot entirely is to purchase replacement property at a value equal to or greater than the relinquished property's net sale price, and to carry debt equal to or greater than what was paid off, unless additional cash offsets the difference. Falling short on either measure does not disqualify the exchange, it simply makes part of the transaction taxable, calculated and reported on Form 8824 with the rest of the exchange.
Common 1031 Exchange Questions
Is boot always bad for an exchanger?
Not necessarily. Some exchangers intentionally take a small amount of cash boot to access liquidity, accepting tax on that portion while still deferring gain on the majority of the transaction.
Does boot cancel the whole exchange?
No. Boot makes only the boot portion taxable. The remainder of the gain tied to the like-kind property exchanged still qualifies for deferral under Section 1031.
Can you avoid mortgage boot by paying cash instead of getting a new loan?
Yes, bringing outside cash to the replacement closing that is not part of the exchange proceeds can offset a lower mortgage balance and avoid mortgage boot on that portion of the deal.
Are closing costs treated as boot?
Ordinary transactional costs like broker commissions, title fees, and qualified intermediary fees are generally not treated as boot when paid from exchange proceeds. Costs unrelated to the sale or purchase, such as prorated rent or security deposits, can be treated differently and are worth reviewing closely.
How is boot actually reported to the IRS?
Boot is calculated and reported on Form 8824 alongside the rest of the exchange, with the recognized gain flowing through to the exchanger's tax return for that year.
