Partial 1031 Exchange
A partial 1031 exchange is a like-kind exchange in which the investor reinvests only part of the sale proceeds — or buys a cheaper replacement property — and pays tax on the value kept, called boot, while deferring tax on the rest. The exchange remains valid; only the portion taken out is taxable, capped at the total gain.
Yes, it's allowed
Nothing in Section 1031 is all-or-nothing. An investor who sells for $800,000 can buy a $650,000 replacement, pocket $150,000, and still defer the tax on everything reinvested. The $150,000 is boot — taxable in the year of the sale, up to the amount of the total gain.
How the taxable slice is measured
Boot arises two ways, and they add together: cash kept (sale proceeds that never make it into the replacement) and debt reduced (a smaller mortgage on the replacement than the one paid off, unless fresh cash covers the gap). The tax due is boot × the investor's combined rate on the gain — and the IRS treats boot as gain first, not return of basis, so a small cash-out is usually taxable in full.
When a partial exchange makes sense
Common reasons: paying down other debt, pulling out a down payment for a separate purchase, or de-leveraging in retirement. The trade is explicit — a known tax bill on the slice taken out, in exchange for liquidity now. When the boot approaches the total gain, the exchange stops earning its fees: at that point a plain taxable sale is simpler.
The mechanics don't relax
A partial exchange follows every normal rule: proceeds held by a qualified intermediary, the 45-day identification and 180-day closing deadlines, like-kind replacement property. The cash-out is typically received either at closing or after the exchange completes — the timing affects which tax year it lands in, so this is one to walk through with a CPA. Definition, not tax advice.