Is there a minimum amount you must reinvest to do a partial exchange?

No minimum. You can reinvest as little as $1 (though practically, it needs to be at least equal to the replacement property purchase price). The only requirement is that the replacement property meets the like-kind test. If you sell for $800,000 and buy a replacement for $100,000, you are reinvesting only $100,000 and keeping $700,000 as boot (minus any debt payoff). The $700,000 is recognized gain; the remaining gain is deferred. There is no "safe harbor" minimum reinvestment amount; the math is straightforward.

Can I do a partial exchange and still buy multiple replacement properties?

Yes. If you identify multiple replacement properties, the purchase prices of all of them (combined) determine the total reinvested amount. For example, if you sell for $800,000 and identify three properties for $250,000, $200,000, and $150,000 (total $600,000), you reinvest $600,000 and keep $200,000 as cash boot. The multiple properties are fine as long as you stay within the identification rules (3-property rule or 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 (if debt decreased) or boot paid (if debt increased). A client might take cash out while also increasing debt, which can partially offset the cash boot. Conversely, they might keep all proceeds but decrease debt, which creates mortgage boot. Example: Sell for $800,000 with $400,000 debt. Buy for $700,000 with $200,000 debt. Debt decreased by $200,000 (mortgage boot). If the client keeps no cash, total boot is $200,000, recognized gain is $200,000. This is a "partial" exchange in effect, even though no cash was kept.

Can the client change their mind about how much cash to keep?

Not after the 1031 exchange is complete. The exchange agreement, identification letter, and closing documents fix the cash position at closing. If the client receives unexpected cash (e.g., a final proration or seller concession), they must immediately reinvest it or accept it as boot. The timing is fixed by the 180-day window. If closing occurs at Day 175 and the client receives additional funds, they have only 5 days to reinvest them. In practice, the client and QI should agree on the cash position well before closing.

How is a partial exchange reported on Form 8824?

Part III of Form 8824 calculates recognized gain as the lesser of realized gain or boot received. If realized gain is $300,000 and boot received is $80,000, the client recognizes $80,000 and defers $220,000. This is straightforward on the form. The basis of the replacement property is adjusted downward for the boot received, so basis is lower than it would be in a full exchange. The basis calculation formula includes the boot received as a deduction (reduces new basis), which makes sense: you kept some cash, so less capital is reinvested.

Partial 1031 Exchanges: Advisor Guide to Deferring Some Gain and Taking Cash

13 min read · For Advisors · Last updated March 2026

Key Takeaways

A partial 1031 exchange allows a client to extract some cash (or accept debt reduction) while deferring the remaining gain. The recognized gain equals the boot received, and the client must pay taxes on that portion. By modeling recognized gain at different cash-out levels, advisors can present options to clients seeking some liquidity without full recognition.

What Is a Partial 1031 Exchange?

A partial 1031 exchange occurs when the client receives boot (cash or net debt reduction) and defers only the remaining gain. The recognized gain equals the boot received, up to the realized gain.

It is a legitimate structure that many advisors use with clients who want some liquidity but want to defer as much gain as possible.

Example: Client D sells a property for $800,000 (basis $250,000, so $550,000 gain). They buy a replacement for $700,000. They pocket the $100,000 difference in cash.

Realized gain: $550,000
Boot received: $100,000 (cash)
Recognized gain: Lesser of $550,000 or $100,000 = $100,000
Deferred gain: $450,000
Tax due in Year 1: $100,000 × client's rate (e.g., 24%) = $24,000

The client extracts $100,000 in cash and pays $24,000 in tax. Net cash after tax: $76,000.

Without the 1031 exchange (straight sale), the client would recognize the full $550,000 gain, pay ~$132,000 in tax, and net $668,000 in cash. But with the partial exchange, the client nets $76,000 immediately plus the appreciation and deferred gain (if the replacement is later exchanged or sold).

For many clients, the liquidity need plus the deferral benefit makes the partial exchange attractive.

Modeling: Tax at Different Cash-Out Levels

Before closing, advisors should model the tax cost of different cash-out scenarios. This lets clients make an informed choice.

Setup: Client E's Partial Exchange Options

Client E is selling a rental property:

Sale price: $900,000
Adjusted basis: $300,000
Outstanding debt: $200,000
Realized gain: $900,000 - $300,000 = $600,000

Client E has identified a replacement property for sale at various prices. Let's model different purchase prices.

Scenario A: Buy for $900,000 (Full Exchange, $0 Cash Boot)

Purchase price: $900,000
New mortgage: $500,000 (client's choice to borrow more)
Client adds cash from sale proceeds: $400,000
Cash kept as boot: $0
Mortgage boot: Old debt $200,000, new debt $500,000. Net debt increase of $300,000. Zero mortgage boot.
Total boot: $0
Recognized gain: $0
Deferred gain: $600,000
Tax due: $0

Client reinvests all proceeds plus borrows additional cash. Full deferral.

Scenario B: Buy for $850,000 ($50,000 Cash Boot)

Purchase price: $850,000
New mortgage: $400,000
Client adds cash from sale proceeds: $450,000
Cash kept as boot: $50,000
Mortgage boot: $0 (old $200K vs. new $400K, net increase)
Total boot: $50,000
Recognized gain: $50,000
Deferred gain: $550,000
Tax due: $50,000 × 24% = $12,000

Client extracts $50,000 and pays $12,000 in tax. Net cash after tax: $38,000.

Scenario C: Buy for $800,000 ($100,000 Cash Boot)

Purchase price: $800,000
New mortgage: $300,000
Client adds cash from sale proceeds: $500,000
Cash kept as boot: $100,000
Mortgage boot: Old $200K vs. new $300K, net increase of $100K. Zero mortgage boot.
Total boot: $100,000
Recognized gain: $100,000
Deferred gain: $500,000
Tax due: $100,000 × 24% = $24,000

Client extracts $100,000 and pays $24,000 in tax. Net cash after tax: $76,000.

Scenario D: Buy for $750,000 ($150,000 Cash Boot)

Purchase price: $750,000
New mortgage: $250,000
Client adds cash from sale proceeds: $500,000
Cash kept as boot: $150,000
Mortgage boot: Old $200K vs. new $250K, net increase of $50K. Zero mortgage boot.
Total boot: $150,000
Recognized gain: $150,000
Deferred gain: $450,000
Tax due: $150,000 × 24% = $36,000

Client extracts $150,000 and pays $36,000 in tax. Net cash after tax: $114,000.

Scenario E: Buy for $700,000 with Debt Reduction ($200,000 Mortgage Boot)

Purchase price: $700,000
New mortgage: $0 (client pays cash, intentionally reducing debt)
Client adds cash from sale proceeds: $700,000
Cash kept as boot: $0
Mortgage boot: Old debt $200,000, new debt $0. Net debt reduction of $200,000. This is mortgage boot.
Total boot: $200,000 (all mortgage boot, no cash boot)
Recognized gain: $200,000
Deferred gain: $400,000
Tax due: $200,000 × 24% = $48,000

Client extracts $200,000 in debt relief (pays off the old mortgage) and recognizes $200,000 gain, paying $48,000 in tax. From a cash perspective, client keeps no cash, but they eliminate 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)

Client E can see the trade-off: more cash out means more tax due this year. If they need $100,000 in liquidity, they recognize $100,000 in gain and pay $24,000 in tax, netting $76,000. If they can avoid taking cash and instead pay off the old mortgage, they recognize $200,000 in gain but get $200,000 in debt relief (a different form of liquidity).

Common Partial Exchange Patterns

Pattern 1: Emergency Fund or Buffer

Client F is doing an exchange but wants to set aside $30,000 for an emergency fund (unexpected repairs, vacancy reserves, etc.).

Scenario: Sell for $600,000, buy for $570,000, take $30,000 in cash.

Realized gain: $300,000 (basis $300,000)
Boot: $30,000
Recognized gain: $30,000
Tax: $30,000 × 24% = $7,200
Net emergency fund: $22,800

This is a clean way to extract a modest amount while mostly deferring. Client F still defers $270,000 in gain.

Pattern 2: 1031 + Diversification Loan

Client G is selling a large single property and wants to diversify into multiple properties but also wants a liquidity cushion. They do a partial exchange and reinvest in a mix of properties plus take a small amount of cash.

Scenario: Sell for $1,200,000, buy for $1,100,000 (diversified across two properties), take $100,000 cash.

Realized gain: $600,000 (basis $600,000)
Boot: $100,000
Recognized gain: $100,000
Tax: $100,000 × 24% = $24,000
Net cash: $76,000

Client G diversifies, defers $500,000 of gain, and has $76,000 in cash after tax.

Pattern 3: "Partial + DST Backstop" for Uncertain Replacement

Client H is selling a property for $800,000 but is not 100% certain which replacement property they want. They identify a primary replacement for $750,000, but that leaves $50,000 unaccounted for.

Strategy: Identify the $750,000 property as the primary replacement, but also identify a Delaware Statutory Trust (DST) as a backup for the remaining $50,000.

If they find another property during the 45-day identification window, they can designate that for the remaining $50,000. If not, the QI invests the $50,000 in a DST that pays quarterly or annual distributions (which the client can take as income or reinvest).

This way, they avoid the cash boot while staying flexible on the final replacement.

Another variant: Client identifies a large replacement for $900,000 (more than the sale price of $800,000), commits to adding $100,000 from personal funds, and can adjust the final closing amount if needed.

Debt Boot Complications in Partial Exchanges

Mortgage boot is often overlooked in partial exchange planning, and it compounds the client's tax exposure.

Example: Downsizing with Debt Reduction

Client I sells for $1,000,000 with $500,000 debt. They want to downsize, buying a $700,000 property with a $200,000 mortgage.

Quick calculation:

Cash available: $1,000,000 - $500,000 (payoff) = $500,000
Cash to invest: $700,000 purchase, $200,000 new mortgage = client needs to invest $500,000
Cash left over: $0

But wait: Mortgage boot = old debt $500,000 - new debt $200,000 = $300,000 reduction.

Even though the client did not keep cash, they received $300,000 in mortgage boot (the relief from debt).

If the client's realized gain is $400,000 (example), they recognize $300,000 (the boot), not $0.

The client's tax bill is surprising: they thought they were doing a full exchange (no cash out), but the debt reduction created boot, and they owe tax on $300,000 of gain.

This is the "hidden boot" scenario many practitioners miss.

Mitigating Debt Boot

To avoid mortgage boot in a downsizing scenario, the client can:

Increase the new mortgage (borrow more)
Add cash from personal funds (not exchange proceeds) to offset the debt reduction

Example: Same scenario, but client adds $300,000 from personal savings (not from the sale proceeds) at the replacement closing, resulting in a new mortgage of only $200,000 plus $300,000 client cash. But the sale proceeds (net of debt payoff) are still $500,000. To close on a $700,000 property with a $200,000 mortgage and $300,000 client cash, the client needs a third source of $200,000, which could be from a new loan or additional cash from reserves.

This is getting complicated. The simpler solution is to accept the mortgage boot and recognize the associated gain, or to increase the new mortgage to match the old mortgage (eliminating mortgage boot).

Partial Exchange Worksheet for Advisors

Use this worksheet to model and document partial exchange scenarios:

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

When to Recommend a Partial Exchange

Recommend a partial exchange when:

The client has a genuine liquidity need (known, not speculative)
The client is open to paying some tax now to solve that need
The partial deferral is better than a full sale
The client understands the trade-off (lower basis in replacement, lower future depreciation)

Avoid a partial exchange when:

The client is taking cash "just in case" (undefined need)
The client thinks they can "always do another exchange" to re-defer the recognized gain (they can't; once recognized, it's gone)
The client is not prepared for the tax bill
A loan or other financing solution would solve the liquidity need at a lower cost

Link to Related Resources

For boot mechanics and how they factor into partial exchanges, see Boot for Advisors: Cash Boot, Mortgage Boot, and Hidden Boot.

For Form 8824 reporting of partial exchanges, see Form 8824 Advisor Walkthrough.

For basis calculation in partial exchanges, see Basis Tracking After a 1031 Exchange: Advisor Worksheet and Example.

For identification strategies and backup options (DSTs, multiple properties), see Backup Identification Strategies and DSTs in 1031 Exchanges.

Use the 1031 Exchange Tax Savings Calculator to model partial exchange scenarios and compare tax outcomes.

The Bottom Line

Run partial exchange scenarios with clients before closing. Show the tax cost of each cash-out level. Consider debt implications (mortgage boot). For clients wanting liquidity, a partial exchange is often better than a full sale, and a "partial plus DST backstop" can handle remaining proceeds if the replacement property is smaller than expected.