Is mortgage reduction automatically considered boot?

Yes, but only the net reduction. If the client owed $300K on the relinquished property and owes $250K on the replacement, the $50K reduction is mortgage boot and will trigger recognized gain to the extent of $50K. However, if debt increased (old debt $300K, new debt $350K), there is zero mortgage boot from the debt side; the additional $50K borrowed is just a larger loan, not boot received.

Can closing costs create boot?

Yes, if they are paid from exchange proceeds or if the exchange funds are used to pay non-qualifying costs. For example, if homeowners insurance, HOA transfer fees, or lender discount points are paid from the 1031 exchange proceeds instead of the client's separate funds, those amounts are treated as cash diverted from the exchange and become boot. Always review the closing statement line by line to identify which costs are paid from proceeds.

Can you recognize a loss in a 1031 exchange?

No. If the replacement property is cheaper than the relinquished property (sale price exceeds purchase price), the client does not recognize a loss. Instead, they recognize gain to the extent of boot received. The loss is deferred through the carryover basis. Example: sold for $600K (basis $300K), bought for $500K, keeping $100K in cash. Client recognizes the $100K in gain but does not get to recognize the opportunity loss.

How is boot taxed (capital gains vs ordinary)?

Boot is taxed according to the nature of the gain deferred. If the deferred gain includes depreciation recapture (Section 1250 unrecaptured gain), the recognized gain may be taxed partly at 25% (unrecaptured gain) and partly at capital gains rates. This requires careful coordination with Form 8824 and Schedule D. Consult with the client's CPA to determine the exact tax rate on the recognized gain; it is not always 20% (long-term capital gains).

Can boot be offset by adding cash at closing?

Yes, partly. If the client receives boot, they can add cash at the replacement closing to offset some or all of the boot. Example: the exchange would generate $30K in mortgage boot, but the client adds $30K from their own funds (not from exchange proceeds) at closing. The net boot is zero. However, the additional cash added must come from a source outside the exchange proceeds. Document this carefully: the cash comes from client's account, not the exchange proceeds.

Boot for Advisors: Cash Boot, Mortgage Boot, and Hidden Boot

15 min read · For Advisors · Last updated March 2026

Key Takeaways

Boot is any non-like-kind property received in an exchange. The three main types are cash boot (proceeds not reinvested), mortgage boot (net debt reduction), and hidden boot (closing costs, prorations, personal property). Receiving any boot triggers recognized gain to the extent boot received, which the client must pay taxes on in that year.

What Is Boot?

In 1031 exchange jargon, boot is any property you receive that is not of like-kind to the property you gave up. In the context of real estate exchanges, almost all boot is either cash, a reduction in debt, or a non-real estate item (personal property, stocks, notes, etc.).

The critical tax consequence: if you receive any boot, you must recognize gain to the extent of the boot received. You cannot defer 100% of your gain.

Example: Client sells for $800,000 (basis $300,000, so $500,000 gain). They purchase a replacement for $700,000 and take $100,000 in cash. They recognize $100,000 in gain and defer $400,000.

Boot is reported on Form 8824, Part III, and the recognized gain flows to Form 1040 Schedule D, creating a current-year tax liability.

Type 1: Cash Boot

Cash boot is the simplest form: money the client keeps from the exchange that is not reinvested in like-kind property.

Example 1: Downsize and Pocket Cash

Client sells a rental property for $800,000 (adjusted basis $250,000). They want to buy a smaller property for $650,000 and keep $150,000 in cash.

Sale proceeds: $800,000
Purchase price: $650,000
Cash kept: $150,000
Realized gain: $800,000 - $250,000 = $550,000
Recognized gain: Lesser of realized gain ($550,000) or boot received ($150,000) = $150,000
Deferred gain: $550,000 - $150,000 = $400,000
Tax due in Year 1: $150,000 gain at the client's marginal rate (e.g., 20% federal + 3.8% NIIT = 23.8%, or ~$35,700)

The client gets $150,000 in cash but pays taxes on a $150,000 gain. The economic benefit is reduced by the tax cost.

Example 2: Refinance Instead of Cashing Out

Same client, same sale price of $800,000 and purchase price of $650,000. But instead of keeping $150,000 in cash, they borrow it.

Purchase price: $650,000
Client takes a $150,000 loan (mortgage or HELOC)
No cash kept, so boot received = $0
Recognized gain: $0
Deferred gain: $550,000
Tax due in Year 1: $0

The client still has access to the $150,000 through debt, but the 1031 exchange defers the full $550,000 gain. This is a common planning strategy: maximize the deferral and borrow for liquidity.

Type 2: Mortgage Boot (Net Debt Reduction)

Mortgage boot occurs when the client's total indebtedness decreases. It doesn't matter if the client also receives cash; the debt reduction itself is boot.

Example 3: Debt Reduction Creates Boot

Client sells a property with $400,000 in debt for $900,000 (basis $200,000, so $700,000 gain). They purchase a replacement for $875,000 with $300,000 in new debt.

Debt calculation:

Old debt: $400,000
New debt: $300,000
Net debt reduction: $100,000 (this is mortgage boot)

Boot and gain:

Cash received (beyond debt payoff): $0
Mortgage boot: $100,000
Total boot: $100,000
Recognized gain: Lesser of $700,000 realized gain or $100,000 boot = $100,000
Deferred gain: $600,000

Even though the client did not receive cash, they received the economic benefit of a $100,000 reduction in debt, and they must recognize $100,000 in gain.

Example 4: Debt Increases (No Mortgage Boot)

Client sells for $900,000 (basis $200,000, so $700,000 gain) with $350,000 in debt. They purchase a replacement for $950,000 with $500,000 in new debt.

Debt calculation:

Old debt: $350,000
New debt: $500,000
Net debt change: $150,000 increase (zero mortgage boot)

Boot and gain:

Mortgage boot: $0 (debt increased, not decreased)
The client borrowed an additional $150,000 to purchase a more expensive property
Recognized gain: $0 (assuming no cash received)
Deferred gain: $700,000

Increasing debt is not boot; it's just a larger mortgage on a more valuable property.

Type 3: Hidden Boot

Hidden boot is where advisors often miss exposure. It includes closing costs paid from exchange proceeds, prorations received in cash, personal property inclusions, and non-qualifying improvements.

Example 5: Closing Costs Paid from Proceeds

Client's sale closes and produces $500,000 in proceeds (after debt payoff and realtor commission). The client's closing costs on the replacement property include:

Title insurance: $2,000
Lender fees (discount points, origination): $5,000
Property inspection and appraisal: $1,500
HOA transfer fees: $500
Total: $9,000

Question: Who pays these closing costs?

If the QI (or exchange funds) pay them, they reduce the amount of cash available to reinvest in the replacement. So if the client wanted to buy for $500,000, and $9,000 of their proceeds are diverted to closing costs, they can only invest $491,000 in real property, and the $9,000 difference is boot.

If the client pays these costs from their personal funds (outside the exchange), there is no boot.

The IRS scrutinizes this carefully. The Form 8824 may show no cash boot, but the closing statement will reveal that closing costs came from the sale proceeds. That's a red flag.

Practical advice: Direct the QI to pay buyer's closing costs directly from the exchange proceeds. This is transparent and documented. Then calculate boot accordingly.

Example 6: Proration Received in Cash

In a rental property exchange, prorations often occur. The seller receives rent for days in the month prior to closing; the buyer receives a credit. Similarly, property taxes, utilities, and insurance are often prorated.

If the seller (your client) receives a cash proration for rent or other items, that's cash in hand that should be reinvested. If it's not, it's boot.

Example: Property closes on the 20th of the month. The seller (your client) had collected rent for the month. The buyer's share (10 days) is prorated. The QI receives a cash proration credit of $2,000 for the buyer's portion. If this $2,000 is not reinvested in the replacement, it's boot.

Example 7: Personal Property Included in Exchange

Some 1031 exchanges include personal property (furniture, equipment, vehicles, etc.) along with the real property. Personal property is not like-kind to real property, so it's boot if received.

Example: Client sells an apartment building for $1,200,000 (including $30,000 in used appliances and furniture). If the client does not re-purchase similar personal property, the $30,000 is boot received.

If they do include equivalent personal property in the replacement acquisition, it's not boot.

Boot Minimization Checklist

Before the replacement property closes, run through this checklist with the QI and closing team:

1. Price Comparison

What is the sale price of the relinquished property?
What is the purchase price of the replacement?
Is the replacement price at least equal to the relinquished property price? (Protects against cash boot.)

2. Debt Comparison

What was the total outstanding debt (principal balance only, no accrued interest) on the relinquished property?
What is the principal balance of the new mortgage or note on the replacement property?
Is the new debt at least equal to the old debt? (Protects against mortgage boot.)
If the new debt is less, how much is the reduction, and is this acceptable to the client?

3. Closing Cost Review (Relinquished Property)

Realtor commission (if applicable): paid by proceeds or client funds?
Attorney fees, title insurance, recording fees: paid by proceeds or from client funds?
Any transfer taxes or documentary stamps: who pays?
QI fees: are they paid directly from proceeds or from a separate fee arrangement?
Total selling expenses should reduce the amount available for reinvestment.

4. Closing Cost Review (Replacement Property)

Buyer's title insurance: paid by proceeds or client funds?
Lender fees, appraisal, inspection: paid by proceeds or client funds?
HOA transfer, legal, document prep: paid by proceeds or client funds?
Are any of these expenses reducing the reinvested amount? If yes, treat as boot.

5. Proration and Cash Adjustments

Will the seller (your client) receive any cash prorations (rent, property taxes, utilities, insurance)?
Are these prorations being reinvested or kept as cash?
If kept as cash, this is boot.

6. Personal Property

Does the sale include any personal property (appliances, furniture, vehicles)?
Is the replacement also acquiring equivalent personal property?
If not, the sale value of the personal property is boot received.

7. Net Boot Position

Cash boot: [amount or $0]
Mortgage boot: [amount or $0]
Closing cost boot (if any): [amount or $0]
Proration boot (if any): [amount or $0]
Personal property boot (if any): [amount or $0]
Total boot: [sum]

8. Boot Offset Strategy

Can the client add cash from external sources (not exchange proceeds) at the replacement closing to offset some boot? If yes, how much?
Can the purchase price be adjusted upward (increase replacement value) to absorb boot? Is the property worth more than currently offered?
Can a different replacement property reduce boot exposure?

Worked Example: Multi-Boot Scenario

Client A sells a commercial property:

Sale price: $1,000,000
Adjusted basis: $400,000
Outstanding mortgage: $450,000
Realtor commission (6%): $60,000
Closing costs (attorney, title, recording): $8,000
Total selling expenses: $68,000

Amount realized: Sale price $1,000,000 + assumed debt $450,000 - selling expenses $68,000 = $1,382,000

Realized gain: $1,382,000 - $400,000 = $982,000

Replacement property:

Purchase price: $950,000
New mortgage: $300,000
Client adds cash from their account: $50,000
Buyer's closing costs paid from proceeds: $10,000 (title, appraisal, lender fees)

Boot calculation:

Cash boot: The client is adding $50,000 from personal funds, which is boot paid (reduces boot owed). No cash is being kept, but $10,000 of proceeds is used for closing costs.

Actually, let me reframe: The QI receives $1,382,000. It pays out $950,000 (purchase price) + $10,000 (closing costs) + $300,000 (new mortgage assumes the QI is acting as conduit) = $1,260,000 used. Remaining proceeds: $122,000.

The client is adding $50,000 from personal funds (outside exchange). Net cash available: $122,000 + $50,000 = $172,000 kept as cash boot.

Wait, let me recalculate more carefully. The mortgage goes to the lender, not through the QI proceeds flow. The correct flow is:

QI receives sale proceeds: $1,000,000 QI pays: New mortgage (lender pays directly): $0 (outside exchange) QI pays: Closing costs ($10,000) QI pays: Purchase price to seller ($950,000) QI balance: $1,000,000 - $10,000 - $950,000 = $40,000 (cash kept, not reinvested)

The client's old mortgage ($450,000) is paid off from proceeds (reducing amount realized calculation, already done above).

Mortgage boot: Old debt $450,000, new debt $300,000. Reduction of $150,000 is mortgage boot.
Closing cost boot: $10,000 of proceeds diverted to closing costs (already embedded in the cash calculation).
Total boot: $40,000 (cash) + $150,000 (mortgage reduction) = $190,000

Recognized gain: Lesser of realized gain ($982,000) or boot received ($190,000) = $190,000

Deferred gain: $982,000 - $190,000 = $792,000

The client's tax bill for Year 1: $190,000 gain at, say, 24% effective rate = ~$45,600.

How to minimize: If the client added $50,000 from personal funds at closing, the purchase price could be effectively $1,000,000 (950,000 + 50,000 added cash), which matches the sale price and eliminates cash boot. The mortgage boot of $150,000 remains. Total boot would be $150,000 instead of $190,000, saving ~$9,600 in taxes.

Alternatively, if a larger replacement property were found for $1,000,000 with a new mortgage of $450,000 (matching the old debt), total boot would be zero (assuming no cash kept). But the client may not want a larger property.

When Not to Avoid Boot

Sometimes, boot is acceptable. If the client's long-term plan is to extract some capital (e.g., fund retirement, diversify into other investments), paying some tax now on a portion of the gain may make sense.

Example: Client has $1 million in real estate gains. They plan to sell in 5 years anyway. Taking $200,000 in cash boot now (and paying ~$48,000 in taxes at 24%) accelerates capital extraction and reduces their future tax bill. This is a judgment call, but it's legitimate planning.

Always discuss with the client: would they prefer to defer all gain and keep larger debt, or pay some tax now for liquidity?

Link to Related Resources

For detailed basis calculation after an exchange involving boot, see Basis Tracking After a 1031 Exchange: Advisor Worksheet and Example.

For closing cost issues, see 1031 Closing Costs: Advisor Reference and Documentation.

For the Form 8824 calculation itself, see Form 8824 Advisor Walkthrough.

Use the 1031 Exchange Tax Savings Calculator to model boot scenarios and compare recognized gain at different boot levels.

The Bottom Line

Run a detailed boot analysis before closing. Compare sale price to purchase price, compare old debt to new debt, review every closing cost line item, and verify proration handling. A small boot balance can sometimes be eliminated by adding cash at closing or adjusting the purchase price.