1031 Exchange Calculator

How the 1031 exchange calculator works

When you sell a rental for more than its depreciated cost, two taxes come due: capital gains tax on the appreciation and depreciation recapture on the write-offs you claimed along the way. A 1031 exchange — a “like-kind” exchange under Section 1031 of the tax code — lets you roll the proceeds into another investment property and postpone both. This calculator estimates what that postponed bill would be, so you can see the value of the deferral before you commit to an exchange.

It works in the natural order the tax follows. First it finds your adjusted basis — original price plus improvements, minus the depreciation you deducted. Then it subtracts that basis from the net sale price to get your total gain. Finally it splits the gain into the part taxed as depreciation recapture (up to 25%) and the part taxed at your capital gains rate, adds any state tax and the 3.8% net investment income tax, and totals the result — the tax a properly structured exchange defers. If you would rather see the bill on an outright sale, the capital gains tax calculator covers that case.

Boot: how to defer the full amount

To defer the entire tax, a 1031 exchange generally has to be complete: you reinvest all of the net proceeds into the replacement property and take on at least as much debt as you paid off. Anything you keep back — cash in your pocket, or a mortgage that shrinks and is not replaced — is called boot, and boot is taxable up to the size of your gain. Trade “up or equal” in both value and debt and there is no boot; trade down and you pay tax on the difference. Because this calculator estimates the full gain, it shows the maximum tax at stake if you did not exchange at all.

The rules that make or break an exchange

A 1031 exchange is powerful but unforgiving on process. The properties must be like-kind investment or business real estate — not your home or a quick flip. A qualified intermediary must hold the sale proceeds; if the money touches your hands, the exchange fails. And two clocks start the day you close: 45 days to formally identify replacement candidates and 180 days to close on one, running together and almost never extended. Miss a step and the whole deferral collapses, so exchanges are planned well in advance with professionals in place.

Types of 1031 exchange (and what does not qualify)

Most exchanges are a delayed exchange: you sell first, then a qualified intermediary holds the cash while you find and close on the replacement inside the 45- and 180-day windows. Two variations solve specific problems. A reverse exchange flips the order — you buy the replacement first (parked with an accommodation titleholder) and sell the old property afterward, handy in a competitive market, though it is costlier and the same clocks apply. A partial exchange reinvests only some of the proceeds; the part you keep is taxable boot, but you still defer tax on the rest. What does not qualify matters just as much: your primary residence, a property held mainly to flip, and (since 2018) anything other than real property. Like-kind is read broadly for real estate — an apartment building can be exchanged for raw land or a retail unit — as long as both are held for investment or business use.

Estimate only — not tax or legal advice. This is a simplified model using flat rates; it does not reflect your full income, brackets, partial exchanges or state-specific rules. Use a qualified intermediary and a tax professional before relying on it.

How to use it & key terms

Enter your original cost, improvements, depreciation, sale price and selling costs, choose your tax rates, then press Calculate to see the adjusted basis, gain and the total tax you could defer.

Is a 1031 exchange worth it? Weighing the trade-offs

A 1031 exchange is not automatic, and the first real decision is whether to do one at all. The investors who face it are usually landlords trading up from a starter rental to a larger building, owners consolidating several small properties into one, or people tired of active management who want something more passive. For all of them the appeal is the same: keep the money that would otherwise go to tax working inside the next property rather than handing a slice to the government today. But the benefit is a deferral, not a gift — the gain rides along on a lower basis into the replacement, waiting to be taxed later, so it is a planning move rather than a reflex. The size of the deferral shown above is only worth capturing if the rest of the deal stands up on its own.

That is why the sharper question is not “how much can I defer?” but “is the replacement worth buying on its own merits?” The strict 45-day identification and 180-day closing clocks create real pressure, and in a competitive market that pressure can push people into a mediocre property just to avoid the tax bill — letting the tax tail wag the dog. Because the money must pass through a qualified intermediary and never your own hands, the logistics have to be arranged before you close the sale, not after. There is also the trade-down trap: if the replacement costs less, or carries less debt than you paid off, the shortfall becomes taxable boot and quietly shrinks the benefit you were chasing.

When does it clearly make sense? When you already have a stronger property in view, when the deferred tax is large relative to the deal, and when you intend to keep building. Because exchanges can be chained for years and heirs may receive a stepped-up basis, a disciplined investor can defer for a lifetime — the “swap till you drop” idea. If instead you want to cash out, simplify, or move into a different asset class entirely, paying the tax now and sizing the bill with the capital gains tax calculator may be the cleaner path. The exchange is a powerful tool, but only when the next property is one you genuinely want to own — there is no prize for deferring tax on a deal you would not otherwise do, so treat the deferral figure here as one input in the decision rather than the answer to it.