Key Takeaways
- Boot is any non-like-kind property received—cash withdrawn or debt reduction—and is taxable as capital gain.
- Cash boot: receiving exchange proceeds rather than reinvesting 100%. Mortgage boot: lower debt on the replacement property.
- Mortgage boot can be offset by contributing additional cash from non-exchange sources at replacement closing.
- "Trade up or sideways, never down" in both value and debt to achieve full tax deferral.
In a 1031 exchange, "boot" is any non-like-kind property received by the investor—and boot is taxable. Cash boot and mortgage boot are the two most common types, and both can inadvertently create tax liability in what was intended to be a fully deferred exchange. This lesson explains boot types, calculations, and avoidance strategies.
Cash Boot
Cash boot occurs when the investor receives cash proceeds from the exchange rather than reinvesting the full amount. This happens when the replacement property costs less than the relinquished property or when the investor withdraws funds from the QI. Example: Relinquished property sells for $400,000 with $100,000 in net equity after loan payoff. The investor purchases a replacement property for $350,000, putting $50,000 in equity and receiving $50,000 back from the QI. The $50,000 received is cash boot—taxable as capital gain. To avoid cash boot, the replacement property must be of equal or greater value than the relinquished property, and all net equity proceeds must be reinvested. The investor can never take constructive receipt of exchange funds—all proceeds must flow through the QI.
Mortgage Boot
Mortgage boot occurs when the debt on the replacement property is less than the debt on the relinquished property—effectively reducing the investor's financial obligation. Example: Relinquished property has a $250,000 mortgage. Replacement property has a $200,000 mortgage. The $50,000 reduction in debt is treated as mortgage boot received by the investor—taxable as capital gain. Mortgage boot can be offset by adding cash. In the example above, if the investor contributes $50,000 of additional cash at closing (from non-exchange sources), the cash offsets the mortgage boot, resulting in no taxable boot. The key principle: to achieve full deferral, both the property value and the total debt must be equal to or greater than the relinquished property. "Trade up or sideways, never down" is the fundamental rule.
| Boot Type | Trigger | Tax Treatment | Avoidance Strategy |
|---|---|---|---|
| Cash Boot | Receiving cash from the exchange | Taxable as capital gain | Reinvest 100% of net equity in replacement |
| Mortgage Boot | Lower debt on replacement than relinquished | Taxable as capital gain | Match or exceed debt; offset with additional cash |
| Unlike Property | Receiving non-real-property in exchange | Taxable at FMV | Ensure all exchange property is real property |
Boot types, triggers, and avoidance strategies in 1031 exchanges
Boot Calculation Workflow
Calculate potential boot before closing on the replacement property using this workflow. Step 1: Determine net equity from the relinquished sale (sale price − selling costs − loan payoff). Step 2: Determine the replacement property purchase price and expected new loan amount. Step 3: Calculate cash invested in replacement (purchase price − new loan = equity needed). Step 4: Compare equity available (Step 1) with equity needed (Step 3). If equity available exceeds equity needed, the excess is potential cash boot. Step 5: Compare relinquished debt (old loan payoff amount) with replacement debt (new loan amount). If relinquished debt exceeds replacement debt, the difference is potential mortgage boot. Step 6: Net cash boot against mortgage boot—additional cash invested can offset mortgage boot. The QI and CPA should perform this calculation before the replacement property is selected to ensure the exchange achieves full deferral.
Key Takeaways
- ✓Boot is any non-like-kind property received—cash withdrawn or debt reduction—and is taxable as capital gain.
- ✓Cash boot: receiving exchange proceeds rather than reinvesting 100%. Mortgage boot: lower debt on the replacement property.
- ✓Mortgage boot can be offset by contributing additional cash from non-exchange sources at replacement closing.
- ✓"Trade up or sideways, never down" in both value and debt to achieve full tax deferral.
Sources
Common Mistakes to Avoid
Receiving cash from the exchange proceeds or "touching" the funds before reinvestment
Consequence: Any exchange proceeds received by the taxpayer (even temporarily) constitute taxable boot—the constructive receipt doctrine can disqualify the exchange
Correction: Exchange proceeds must flow through a Qualified Intermediary at all times; the taxpayer can never receive, control, or have access to the funds during the exchange period
Trading down in debt without adding additional cash to the exchange
Consequence: The net reduction in mortgage creates taxable mortgage boot, even if no cash is received—the tax bill can be thousands of dollars on the debt reduction alone
Correction: Calculate the debt on both properties before closing; if the replacement property has less debt, add enough cash to the exchange to offset the difference
Test Your Knowledge
1.What is "boot" in the context of a 1031 exchange?
2.An investor sells a property with a $200,000 mortgage and acquires a replacement with a $150,000 mortgage. What is the mortgage boot?
3.How can an investor avoid mortgage boot in a 1031 exchange?