Debt Replacement
Debt replacement is the 1031 rule that an investor must take on debt on the replacement property equal to the mortgage paid off, or add cash, to defer all tax.
Definition
Debt replacement refers to a core requirement for full tax deferral in a 1031 exchange: the investor must replace any mortgage debt that was paid off on the relinquished property. If you sell a property with a $400,000 loan, your replacement must carry at least $400,000 of new debt, or you must contribute $400,000 of additional cash to make up the difference.
Falling short creates mortgage boot, the taxable relief from debt. The IRS treats debt reduction as if you received cash, so under-replacing debt triggers recognized gain even if you reinvest all your cash equity.
For DST investors, debt replacement is simplified: DSTs come with pre-arranged, non-recourse financing already in place at a set loan-to-value ratio. An investor simply selects a DST whose built-in leverage matches the debt they need to replace, satisfying the requirement without personally qualifying for a loan.
Key points
- Must replace paid-off mortgage debt to fully defer tax
- Can substitute additional cash for missing debt
- Shortfall creates taxable mortgage boot
- DSTs provide pre-arranged non-recourse debt to match
Related terms
Jerry Baker founded Baker 1031 Investments to help exchange investors move from active property ownership into passive, institutional-quality real estate through DST, 721 exchange, mineral royalty, and Opportunity Zone strategies. He holds the FINRA Series 22 and Series 63 registrations and the Securities Industry Essentials (SIE) qualification. Read full bio →
Reviewed by the Aurora Securities, Inc. compliance team — Aurora Securities, Inc., member FINRA/SIPC. Last reviewed July 2026. Securities are offered through Aurora Securities, Inc.; Baker 1031 Investments, LLC is independent of Aurora Securities, Inc.
This glossary entry is educational and is not investment, tax, or legal advice, or an offer to sell or a solicitation to buy any security. Definitions are general and may not reflect your specific circumstances — consult your own CPA and attorney. Past performance does not guarantee future results.