A partial 1031 exchange lets a client take some cash, or accept a reduction in debt, while deferring the rest of the gain. Recognized gain equals the boot received, and tax is owed on that portion. Modeling recognized gain at several cash-out levels lets an advisor lay the options out for a client who wants liquidity without recognizing everything.
What a partial 1031 exchange actually does
A client sells a property at a large gain, wants to walk away with some of the cash, and still wants to defer as much tax as they can. That is exactly the situation a partial 1031 exchange is built for.
The rule behind it is short. When a client takes boot - cash, or a net reduction in the debt they carry - they recognize gain equal to that boot, up to the total gain realized on the sale, and defer everything above it.
It is a legitimate, common structure for clients who want some liquidity without giving up the rest of the deferral.
Example. Client D sells a property for $800,000. Their basis is $250,000, so the realized gain is $550,000. They buy a replacement for $700,000 and keep the $100,000 difference in cash.
- Realized gain: $550,000
- Boot received: $100,000 in cash
- Recognized gain: the lesser of $550,000 and $100,000, so $100,000
- Deferred gain: $450,000
- Tax this year: $100,000 at the client's rate, say 24%, is $24,000
The client pulls out $100,000, pays $24,000 in tax, and nets $76,000 in the first year.
A straight sale is the yardstick. There the client recognizes the full $550,000 gain, pays roughly $132,000 in tax, and nets $668,000 in cash. The partial exchange trades most of that immediate cash for deferral: $76,000 in hand now, and $450,000 of gain still deferred until the replacement is sold or exchanged again. For a client whose goal is liquidity plus deferral, that trade is the whole point.
Modeling the tax at each cash-out level
The amount of cash a client keeps is a dial, not a switch. Every extra dollar kept is another dollar of recognized gain and more tax this year. Putting the scenarios side by side before closing turns that from an abstract worry into a number the client can weigh.
Client E is selling a rental:
- Sale price: $900,000
- Adjusted basis: $300,000
- Outstanding debt: $200,000
- Realized gain: $600,000
Here are five replacement prices, from full reinvestment down to a cash-heavy exit.
Scenario A: Buy for $900,000.
- New mortgage: $500,000 (the client chooses to borrow more)
- Cash from sale proceeds added: $400,000
- Cash boot: $0
- Mortgage boot: $0. The new $500,000 loan is larger than the old $200,000, so debt rose. Taking on more debt never creates boot.
- Recognized gain: $0
- Deferred gain: $600,000
- Tax due: $0
Full reinvestment plus extra borrowing, and full deferral.
Scenario B: Buy for $850,000.
- New mortgage: $400,000
- Cash from sale proceeds added: $450,000
- Cash boot: $50,000
- Mortgage boot: $0
- Recognized gain: $50,000
- Deferred gain: $550,000
- Tax due: $50,000 at 24% = $12,000
- Net cash after tax: $38,000
Scenario C: Buy for $800,000.
- New mortgage: $300,000
- Cash from sale proceeds added: $500,000
- Cash boot: $100,000
- Mortgage boot: $0
- Recognized gain: $100,000
- Deferred gain: $500,000
- Tax due: $100,000 at 24% = $24,000
- Net cash after tax: $76,000
Scenario D: Buy for $750,000.
- New mortgage: $250,000
- Cash from sale proceeds added: $500,000
- Cash boot: $150,000
- Mortgage boot: $0
- Recognized gain: $150,000
- Deferred gain: $450,000
- Tax due: $150,000 at 24% = $36,000
- Net cash after tax: $114,000
Scenario E: Buy for $700,000, all cash, debt paid off.
- New mortgage: $0 (the client pays cash and intentionally clears the debt)
- Cash from sale proceeds added: $700,000
- Cash boot: $0
- Mortgage boot: $200,000. Paying off the loan drops debt from $200,000 to zero, and that debt relief is boot even though no cash is kept.
- Recognized gain: $200,000
- Deferred gain: $400,000
- Tax due: $200,000 at 24% = $48,000
Here the client keeps no cash but eliminates $200,000 of debt.
Summary table
Scenario | Purchase Price | New Debt | Cash Boot | Mortgage Boot | Total Boot | Recognized Gain | Tax (24%) | Net Liquidity |
|---|---|---|---|---|---|---|---|---|
A (Full) | $900K | $500K | $0 | $0 | $0 | $0 | $0 | $0 |
B | $850K | $400K | $50K | $0 | $50K | $50K | $12K | $38K |
C | $800K | $300K | $100K | $0 | $100K | $100K | $24K | $76K |
D | $750K | $250K | $150K | $0 | $150K | $150K | $36K | $114K |
E | $700K | $0 | $0 | $200K | $200K | $200K | $48K | $0 (debt relief) |
Now the tradeoff is visible. If Client E needs $100,000 in hand, that costs $24,000 in tax and nets $76,000. If they would rather clear the mortgage than pocket cash, they recognize $200,000 of gain and get $200,000 of debt relief, a different form of liquidity, with nothing left in the bank.
Three common partial-exchange patterns
The same mechanism shows up in a few recurring shapes.
Pattern 1: A modest cash buffer
Client F wants to set aside $30,000 as a reserve for repairs or vacancies. They sell for $600,000, buy for $570,000, and take $30,000 in cash.
- Realized gain: $300,000 (basis $300,000)
- Boot: $30,000
- Recognized gain: $30,000
- Tax: $30,000 at 24% = $7,200
- Net reserve after tax: $22,800
A clean way to pull out a small amount while deferring the other $270,000 of gain.
Pattern 2: Diversify and keep a cushion
Client G is selling one large property, wants to spread into several, and wants a little cash on the side. They sell for $1,200,000, buy $1,100,000 across two properties, and take $100,000 in cash.
- Realized gain: $600,000 (basis $600,000)
- Boot: $100,000
- Recognized gain: $100,000
- Tax: $100,000 at 24% = $24,000
- Net cash after tax: $76,000
Diversification, $500,000 of gain still deferred, and $76,000 in hand.
Pattern 3: A DST backstop when the replacement is uncertain
Client H is selling for $800,000 but hasn't settled on a replacement. They identify a primary property at $750,000, which leaves $50,000 unspoken for. The fix is to identify a Delaware Statutory Trust (DST), a fractional stake in institutional real estate that itself qualifies as like-kind replacement, as the backstop for that $50,000.
If they find another property inside the 45-day identification window, they can point the $50,000 there. If not, the qualified intermediary (QI), the third party that holds the sale proceeds between the two closings, puts the $50,000 into the DST, which pays quarterly or annual distributions the client can take as income or reinvest. Either way, no cash boot, and the final replacement stays flexible.
A variant runs the other direction: identify a larger replacement at $900,000, above the $800,000 sale price, commit $100,000 of personal funds toward it, and adjust the final closing amount if needed.
The debt-boot trap in a downsizing exchange
Mortgage boot is the piece practitioners miss most often, and in a downsize it can produce a tax bill the client never saw coming.
Client I sells for $1,000,000 with $500,000 of debt and wants to downsize into a $700,000 property carrying a $200,000 mortgage.
On a cash basis it looks like a clean full exchange:
- Proceeds after paying off the old loan: $500,000
- Cash needed to close ($700,000 price minus the $200,000 new mortgage): $500,000
- Cash left over: $0
No cash comes out, so it feels tax-free. But the debt fell from $500,000 to $200,000, a $300,000 reduction, and that reduction is mortgage boot.
If the realized gain is $400,000, the client recognizes $300,000, not zero. They set out to do a full exchange and end up owing tax on $300,000 of gain. That is the hidden-boot scenario.
Two ways to close the debt-boot gap
Debt relief is boot because it frees the client's capital the same way cash would. In a downsize, there are two levers:
- Borrow more on the replacement, bringing the new debt back up toward the old level. Matching the old $500,000 eliminates the mortgage boot entirely.
- Add cash from personal funds (not exchange proceeds) to offset the smaller loan.
The second lever gets complicated fast, because the sale proceeds usually already cover the purchase, so layering in personal cash and coordinating who funds what at closing takes careful sequencing. In practice the cleaner choices are to raise the new mortgage to match the old, which erases the boot, or to accept the mortgage boot and recognize the gain that comes with it.
A worksheet to model and document each scenario
Use this to model the options and record the one the client selects:
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PARTIAL 1031 EXCHANGE ANALYSIS WORKSHEET
Client: [name]
Relinquished Property: [description]
Sale Price: $ [___]
RELINQUISHED PROPERTY ANALYSIS:
Sale Price: $ [___]
Less: Debt Payoff: $ [___]
Less: Selling Expenses: $ [___]
Net Sale Proceeds: $ [___]
Adjusted Basis: $ [___]
REALIZED GAIN: $ [___]
SCENARIO MODELING:
[For each scenario, fill in the columns below]
Scenario Name: [_] [_] [_] [_]
Replacement Purchase Price: $ $ $ $
New Mortgage: $ $ $ $
Client Cash Added (from proceeds): $ $ $ $
Client Cash Added (from personal funds): $ $ $ $
TOTAL INVESTMENT: $ $ $ $
Cash Boot (cash kept, not reinvested): $ $ $ $
Mortgage Boot (old debt - new debt): $ $ $ $
TOTAL BOOT RECEIVED: $ $ $ $
Recognized Gain (lesser of realized or boot): $ $ $ $
Tax at [__]% rate: $ $ $ $
NET CASH TO CLIENT AFTER TAX: $ $ $ $
CLIENT CONVERSATION POINTS:
- What is your liquidity need? $[___]
- What tax rate applies to you? [___]%
- Would you prefer to avoid mortgage boot? Yes / No
- Can you add cash from personal sources? Yes / No / Maybe
SELECTED SCENARIO: [___]
Purchase price: $[___]
Cash to be kept: $[___]
Tax due: $[___]
Net cash after tax: $[___]
Deferred gain: $[___]
QI & CLOSING COORDINATION:
- QI must be notified of the partial exchange structure
- Closing statement must clearly show cash kept vs. reinvested
- Client must decide on cash position before 180-day deadline
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Where a partial exchange fits, and where it backfires
A partial exchange fits the situation when:
- The client has a real, defined liquidity need, a known use rather than "just in case."
- The client accepts paying some tax now to meet it.
- A full sale would recognize gain the client would rather keep deferred.
- The client understands the cost: a lower basis in the replacement, and therefore less depreciation to deduct later.
It tends to backfire when:
- The client is pulling cash "just in case," with no defined use.
- The client assumes they can "do another exchange later" to re-defer the recognized gain. They can't. Once gain is recognized, it is permanent.
- The client is not prepared for the tax bill.
- A loan or other financing would meet the liquidity need at a lower cost.
Related guides and tools
- Boot mechanics and how each type feeds a partial exchange: Boot for Advisors: Cash Boot, Mortgage Boot, and Hidden Boot
- Reporting a partial exchange on the tax form: Form 8824 Advisor Walkthrough
- Basis after a partial exchange: Basis Tracking After a 1031 Exchange: Advisor Worksheet and Example
- Identification and backup options like DSTs and multiple properties: Backup Identification Strategies and DSTs in 1031 Exchanges
- Model and compare scenarios with the 1031 Exchange Tax Savings Calculator
Model the cash-out scenarios with a client before closing, and show the tax cost at each level. Weigh the debt side too, since a reduction in debt creates mortgage boot even when no cash changes hands. For a client who wants liquidity, a partial exchange keeps part of the gain deferred that a full sale would recognize, and a partial-plus-DST backstop can absorb leftover proceeds when the replacement comes in smaller than expected.
Frequently asked questions
Is there a minimum amount that must be reinvested to do a partial exchange?
No. In principle you could reinvest a small fraction and keep the rest as boot; in practice the amount reinvested is simply whatever the replacement property costs. The only hard requirement is that the replacement meets the like-kind test. Sell for $800,000 and buy a replacement for $100,000, and you have reinvested $100,000 and kept $700,000 as boot (less any debt payoff). That $700,000 is recognized gain, and the rest is deferred. There is no safe-harbor minimum reinvestment; the math is straightforward.
Can I do a partial exchange and still buy multiple replacement properties?
Yes. When you identify multiple replacements, their combined purchase prices set the total reinvested amount. Sell for $800,000 and identify three properties at $250,000, $200,000, and $150,000 (total $600,000), and you reinvest $600,000 and keep $200,000 as cash boot. Multiple properties are fine as long as you stay within the identification rules (the three-property rule or the 200% rule) and acquire at least one of them.
How does debt replacement factor into partial exchange calculations?
The net change in debt is boot received when debt goes down, or boot paid when debt goes up. A client can take cash out while also taking on more debt, which can partially offset the cash boot. Or they can keep all the proceeds while reducing debt, which creates mortgage boot. Example: sell for $800,000 with $400,000 of debt, buy for $700,000 with $200,000 of debt. Debt fell by $200,000, so there is $200,000 of mortgage boot. Even with no cash kept, total boot is $200,000 and recognized gain is $200,000, a partial exchange in effect without a dollar of cash changing hands.
Can the client change their mind about how much cash to keep?
Not once the exchange is complete. The exchange agreement, identification letter, and closing documents fix the cash position at closing. If the client receives unexpected cash, a final proration or a seller concession, say, they must reinvest it immediately or accept it as boot. The 180-day window fixes the timing: if closing lands on day 175, only 5 days remain to reinvest anything that comes in. In practice, the client and the qualified intermediary should settle the cash position well before closing.
How is a partial exchange reported on Form 8824?
Part III of Form 8824 computes recognized gain as the lesser of realized gain or boot received. If realized gain is $300,000 and boot is $80,000, the client recognizes $80,000 and defers $220,000. The replacement property's basis is then adjusted downward for the boot received, so it is lower than it would be in a full exchange. Treating the boot as a reduction to new basis makes sense: the client kept some cash, so less capital was reinvested.