Selling investment property?The 1031 exchange clock starts at closing.Plan before you sell
Equity and debt replacement

1031 exchange debt replacement and mortgage boot.

Replacement borrowing does not have to match the old mortgage dollar for dollar. Start by separating purchase funding from the tax treatment of debt relief and cash received.

Check the Day 45 and Day 180 calendar dates →

Educational content by MAG Capital PartnersPlanning contact: Daniel CastañedaEducational sources checked September 25, 2026; transaction-specific tax review is separate.
Purchase funding illustration

Same replacement price, different financing mix.

Assume a $1 million sale and a $500,000 mortgage payoff. The simple sale-minus-payoff amount is $500,000 before expenses. It is not a calculation of actual exchange proceeds.

Two ways to fund a $1 million replacement purchase
Funding sourceMore borrowingMore added cash
Simplified sale cash before expenses$500,000$500,000
New borrowing$500,000$300,000
Additional cash contributed by the exchanger$0$200,000
Total purchase funding$1,000,000$1,000,000

Both columns fund the same purchase price. The financing mix changes; the exhibit does not determine the tax outcome. Sale and purchase expenses, adjusted basis, gain and other closing adjustments are excluded. It does not calculate taxable boot, recognized gain, eligibility or full deferral.

Use your sale price and payoff in the planning calculator →

Why debt matters

Selling property can relieve the owner of a mortgage. If that relieved debt is not offset by replacement debt or additional cash, some gain may be recognized. This is commonly discussed as debt relief or mortgage boot.

There is no rule that replacement property must use the same loan. The planning question is whether the combination of replacement value, reinvested proceeds, replacement liabilities, and added cash supports the intended tax outcome.

Cash received and debt relief are different questions

Cash retained from an exchange is distinct from a mortgage paid off on the property sold. The tax rules consider money, other property and liabilities, with specific netting rules. Taking on a larger replacement loan does not, by itself, establish that cash received is tax-deferred.

Use the closing statements and QI records to identify what was actually received, paid and reinvested. Your CPA should determine the applicable treatment rather than inferring it from the financing comparison.

Numbers to confirm with your advisers

  • Adjusted tax basis, depreciation, and transaction-specific gain
  • Actual debt payoff, sale expenses, and net proceeds sent to the QI
  • Cash or other property you expect to receive
  • Replacement purchase price, closing costs, and financing
  • Whether multiple replacement interests close on different dates
  • Additional cash you will contribute to the replacement purchase
  • State tax treatment and taxpayer or title changes

Primary educational sources

IRS Instructions for Form 8824 ↗

IRS Publication 544 ↗

This page is an educational overview, not a calculation of your tax or a conclusion that any transaction will qualify.

Check the Day 45 and Day 180 calendar dates →

Before the sale closes

Bring the sale price and debt into the conversation early.

Share your expected sale price and remaining debt. We will help organize the questions to take to your qualified intermediary, tax adviser, and investment team.