A partial 1031 exchange lets you take some cash and still defer tax on the part you reinvest. The cash you keep is taxable as "boot," while the reinvested portion qualifies for deferral, as long as it meets every standard exchange requirement.
Sell an investment property, take some of the cash off the table, and it is easy to assume you have forfeited the 1031 tax break entirely. You have not. A partial 1031 exchange lets you defer tax on the portion you reinvest while taking cash, known as boot, on the portion you keep. You pay tax only on the boot. The rest stays deferred.
Done on purpose, this is a tradeoff, not a mistake. A partial exchange hands you liquidity now and deferral on everything you roll forward.
How the tradeoff works
You sell investment property and receive net proceeds. You roll some of that money into replacement property through the exchange. Whatever you keep comes back to you as boot, and boot is taxable.
The rule is narrow. You pay capital gains tax on the boot and defer tax on the amount you reinvest. Boot is taxable only up to your realized gain, so you will never owe more tax on the boot than you would have owed on a straight sale.
Example: a deliberate cash-out
You sell a commercial building for $600,000. Your basis is $300,000, so your gain is $300,000. You put $500,000 into a replacement property and keep $100,000 in cash.
Component | Amount |
|---|---|
Sale price | $600,000 |
Basis | $300,000 |
Realized gain | $300,000 |
Amount reinvested | $500,000 |
Boot (cash taken) | $100,000 |
Tax owed (on boot, at 20% LTCG) | $20,000 |
Tax deferred (on remaining gain) | $200,000 gain deferred = $40,000 in tax deferred |
The $100,000 you took is boot, taxed at the 20% long-term capital gains rate for $20,000. The $200,000 of gain tied to the reinvested money stays deferred. Sell outright with no exchange and the full $300,000 gain is taxable, roughly $60,000. The partial exchange brings that bill down to $20,000 and leaves you $80,000 of the cash after tax.
Example: accidental boot from debt reduction
Not all boot is a choice. You sell a property worth $500,000 that carries a $150,000 mortgage, leaving $350,000 in equity. You buy a replacement for $350,000 with no loan on it.
You reinvested every dollar of equity, but you dropped the debt. The IRS treats that $150,000 of mortgage relief as boot.
Component | Amount |
|---|---|
Sale price | $500,000 |
Mortgage paid off at sale | $150,000 |
Replacement property value | $350,000 |
Debt on replacement | $0 |
Mortgage boot | $150,000 |
Tax owed (up to realized gain) | Depends on gain |
To avoid this kind of surprise, you either take on debt of equal size on the replacement property or add your own cash to make up for the debt you shed. A qualified intermediary (QI), the third party that holds your sale proceeds through the exchange, and your CPA can model the numbers before you make offers.
Reasons people choose a partial exchange
- You need cash. Tuition, a home renovation, rebalancing a portfolio. Taking some proceeds as boot lets the reinvested share keep its deferral.
- You are downsizing. Moving from a larger property to a smaller one produces boot by definition, and the tax comes with the smaller footprint.
- You want to test a new market. Put part of the proceeds into a new geography and take the rest off the table.
- You have hit your portfolio target. The portfolio is where you want it, and pulling some capital out while deferring the rest is a reasonable place to stop.
The standard exchange rules still apply
A partial exchange follows the same structural requirements as a full one:
- The QI must hold the proceeds
- 45-day identification deadline
- 180-day closing deadline
- Identification rules (3-Property, 200%, 95%)
- Same taxpayer on both sides
- Form 8824 filed with your return
The one difference from a full exchange is timing at the end: some proceeds come back to you as boot after the replacement property closes. Until then, your QI holds everything.
How a partial exchange runs, step by step
- Plan before the sale. Decide how much you want as boot and how much to reinvest, and calculate the tax with your CPA.
- Tell your QI. Let them know it is a partial exchange, with the boot amount and the reinvestment target.
- Close the sale. The QI receives all the proceeds.
- Identify replacement property. Within 45 days, identify property that matches your reinvestment amount.
- Close on the replacement. The QI deploys the reinvestment portion.
- Take the boot. After the replacement closes, the QI releases the boot to you, and you receive a 1099 for it at tax time.
Tax planning considerations
- Timing matters. Taking boot in a lower-income year, such as the first year of retirement, may fall into a lower capital gains rate.
- Net investment income tax. The 3.8% NIIT, a surtax on investment income for higher earners, applies to the boot once your modified adjusted gross income clears $200,000 single or $250,000 married filing jointly.
- State taxes. Boot is subject to state capital gains tax in most states. Factor this into your planning.
The forms boot takes
Boot comes in more than one shape - cash boot, mortgage boot, and the hidden kind. Our boot guide walks through each and how it changes the exchange math.
Making the split deliberate
A partial 1031 exchange separates the cash you want now from the tax you can defer. The math is not complicated: boot is taxable, the reinvestment is deferred. What matters is choosing the split on purpose rather than discovering it after the fact.
Decide the boot amount before you sell, tell your QI and CPA, and run the same exchange rules you would for a full exchange.
Want to see the numbers for your own situation? Try the 1031 tax savings calculator, or connect with a qualified advisor to talk through whether a partial exchange fits your goals.
A partial exchange balances cash now against tax deferred later. The math is simple: boot is taxable, the reinvestment is deferred, and the deferred portion has to clear every standard exchange rule.
Frequently asked questions
If I take some cash, do I lose the whole 1031 benefit?
No. You only pay tax on the cash you take (the "boot"). The amount you reinvest still qualifies for tax deferral under Section 1031.
What's the minimum I have to reinvest?
There is no minimum. You can reinvest any amount and take any amount as cash, but whatever you take is taxable boot.
Can I accidentally trigger more tax by reducing my debt?
Yes. If you pay down debt with exchange proceeds, that reduction counts as boot, even when you reinvested all of your cash equity. Watch how the debt is handled between the sale and the purchase.
Does my replacement property have to equal my sale price?
No. Plenty of partial exchanges involve buying a replacement worth less than the sale price and keeping the difference as taxable boot.
Do I still need to follow the 45 and 180-day rules?
Yes. Every dollar you reinvest follows the full 1031 rulebook: identify replacement property within 45 days, close within 180 days, and route the proceeds through a qualified intermediary.