“Boot” is anything you receive in a 1031 exchange that doesn't qualify for tax deferral. When you receive boot, that portion becomes immediately taxable—even if the rest of your exchange succeeds.
Understanding boot is critical because it's one of the most common ways investors accidentally trigger taxes in an otherwise valid 1031 exchange.
What Is Boot?
The word “boot” comes from an old English phrase meaning “something extra.” In a 1031 exchange, boot refers to any value received that isn't like-kind real estate. There are two main types:
Cash Boot
Money you receive from the exchange that isn't reinvested into replacement property.
- Taking cash out of the exchange
- Replacement property costs less than sale price
- Not reinvesting all your equity
Mortgage Boot
The reduction in your debt from the old property to the new one. Less debt = cash you're effectively keeping.
- New mortgage smaller than old mortgage
- Paying off debt without replacing it
- Buying a cheaper property with less leverage
The Two Tests: Value and Debt
To defer 100% of taxes in a 1031 exchange, you must pass two tests:
Test 1: Equal or Greater Value
The replacement property must be worth at least as much as the property you sold. If it's worth less, the difference is cash boot.
Test 2: Equal or Greater Debt (or Add Cash)
The mortgage on the replacement must be at least as large as the mortgage you paid off, OR you must add enough cash to make up the difference.
Cash Boot Example
Property Sold
Replacement Property
Cash Boot: $50,000 ($300,000 proceeds - $250,000 invested)
Tax owed (at 25% rate): ~$12,500
Mortgage Boot Example
Property Sold
Replacement Property
The replacement property is equal value, so no cash boot. But the new mortgage is $100,000 less than the old one.
Mortgage Boot: $100,000 (debt reduction)
Tax owed (at 25% rate): ~$25,000
The Offset Rule: How to Avoid Mortgage Boot
Here's the good news: you can offset mortgage boot by adding cash. If you take on less debt but add more cash, the total investment stays the same and you avoid boot.
Same Example, With Cash Offset
Without Offset
Mortgage reduction: $100,000
Cash added: $0
Boot: $100,000
With Cash Offset
Mortgage reduction: $100,000
Cash added: $100,000
Boot: $0
Key insight: If you want to reduce your leverage (take on less debt), just add cash to make up the difference. This works as long as you still buy a property of equal or greater value.
Combined Example: Both Types of Boot
Property Sold
Replacement Property
Boot Calculation:
Important: You only pay tax on boot up to your actual gain. If your total gain was $150,000 and you received $200,000 in boot, you'd only be taxed on $150,000.
How to Avoid Boot
1. Buy Equal or Greater Value
The simplest rule: make sure your replacement property costs at least as much as what you sold. This eliminates cash boot.
2. Reinvest All Your Proceeds
Don't take any cash out at closing. All equity from your sale should go into the replacement property.
3. Match or Exceed Debt (or Add Cash)
Either take on the same or more debt on the replacement, or add cash to offset any debt reduction.
4. Separate Personal Property
If the property includes furniture, equipment, or other non-real estate items, negotiate them separately from the real estate transaction.
DST Advantage: No Mortgage Boot Concern
Delaware Statutory Trusts (DSTs) solve one of the biggest boot traps: mortgage boot.
Traditional 1031
If you pay off a $300k mortgage and the new property only has $200k in debt, you have $100k in mortgage boot—unless you add $100k cash.
With DST
DSTs already have mortgages in place. Your “share” of the DST debt counts as replacement debt, automatically matching or exceeding what you paid off.
This makes DSTs particularly useful for investors who want to reduce their personal debt obligations while avoiding mortgage boot.
When Accepting Boot Makes Sense
Sometimes receiving boot is the right choice:
You need cash: If you need some funds for other purposes, taking a small amount of boot might be worth the tax.
You want to diversify: Taking $50k boot to invest elsewhere might be worth paying $12k in taxes if it improves your overall portfolio.
Your gain is small: If the tax on boot is minimal, the simplicity of not perfectly structuring the exchange may be worth it.
You have losses to offset: If you have capital losses from other investments, boot becomes less costly because the losses offset the gain.
Key Takeaways
Boot = taxable portion: Any value you receive that isn't reinvested in like-kind real estate triggers immediate tax.
Two types: Cash boot (taking money out) and mortgage boot (reducing debt). Both are taxable.
Offset rule: You can avoid mortgage boot by adding cash. Reducing debt is fine if you add cash to compensate.
DSTs help with mortgage boot: The DST's existing debt counts as your replacement debt, eliminating mortgage boot concerns.
Sometimes boot is okay: If you need liquidity or the tax is small, accepting some boot can be a reasonable choice.
Note: Boot calculations can be complex, especially with multiple properties or partial exchanges. This guide provides general education—consult with a 1031 exchange specialist and tax professional for your specific situation.