1031 Exchange: Rules, Timeline & Tax Calculator (2026)

You bought a rental property a decade ago for $300,000. It's now worth $700,000. If you sell outright, you owe tax on $400,000 of gain — plus up to 25% on whatever depreciation you've taken. For a high-income investor, that's $80,000–$110,000 to the IRS before state taxes. A 1031 like-kind exchange lets you defer that entire bill indefinitely by rolling the proceeds into a replacement property.

The mechanics are strict — miss the 45-day identification deadline by one day and the whole exchange collapses. But done right, a 1031 exchange is one of the most powerful deferral tools available to real estate investors at the $1M–$5M level. Here's what you need to know for 2026.

Interactive tax deferral calculator

Enter your property details to see your estimated federal tax bill if you sell outright vs. defer via a 1031 exchange. Add a replacement property value to model "boot" (the taxable portion if you trade down).

Estimates are federal only. Add your state's capital gains rate — most states tax investment gains at ordinary income rates. Depreciation recapture is modeled at the 25% maximum; if your ordinary income is in a lower bracket, your actual rate on that portion could be lower.

How a 1031 exchange works

Under IRC §1031,¹ no gain or loss is recognized when you exchange real property held for investment or business use for "like-kind" real property you'll also hold for investment or business use. The tax isn't forgiven — it's deferred. Your new property inherits the old property's adjusted basis, carrying the deferred gain forward until you eventually sell without exchanging.

The two critical deadlines

The IRS allows no exceptions for personal hardship. Miss either deadline by one day and the exchange fails entirely.

• 45-day identification deadline. From the date you close on the relinquished (sold) property, you have exactly 45 calendar days to formally identify replacement property in writing to your Qualified Intermediary. You can identify up to 3 properties under the "3-property rule" regardless of value, or more properties if their total fair market value doesn't exceed 200% of what you sold (the "200% rule").
• 180-day closing deadline. You must close on the replacement property within 180 calendar days of selling the relinquished property, or the due date of your tax return for the year of the sale (including extensions) — whichever comes first. If your sale closes in October, your tax return deadline of April 15 may arrive before 180 days is up; file an extension to preserve the full window.

You cannot touch the sale proceeds yourself at any point during the exchange. A Qualified Intermediary (QI) — an independent third party, not your attorney or accountant — must hold the funds between transactions. Using the money for anything before closing on the replacement property disqualifies the exchange.

What qualifies as "like-kind" in 2026

Since the Tax Cuts and Jobs Act (2018), §1031 applies only to real property — not personal property, equipment, vehicles, or artwork. "Like-kind" is broader than it sounds: any U.S. investment real estate qualifies for any other U.S. investment real estate. You can exchange a single-family rental for a commercial building, a farm for an apartment complex, or a raw land parcel for an industrial warehouse.

The property must be held for investment or productive use in a trade or business — not for personal use or primarily for resale (dealer property). Your primary residence does not qualify (use the §121 exclusion instead). A vacation home you also rent may qualify if you meet IRS safe-harbor rules under Rev. Proc. 2008-16.

Boot: the taxable portion

A perfect 1031 exchange defers all tax. Boot is anything you receive that isn't like-kind real property — and boot is taxable in the year of the exchange.

• Cash boot: You sell for $700K and buy a replacement for $600K. The $100K leftover is cash boot, taxed immediately.
• Mortgage-relief boot: Your relinquished property had a $300K mortgage; your replacement only has a $200K mortgage. The $100K in net debt you shed is treated as boot — even if no cash changed hands. To avoid this, make sure the replacement property's debt equals or exceeds the debt on what you sold.
• Personal-property boot: If the seller throws in appliances or equipment, that non-like-kind portion is boot.

Boot is taxed first against the most highly taxed gain component (depreciation recapture at 25%, then capital gains). The calculator above models this proportionally.

Depreciation recapture: the hidden cost §1031 defers

Every year you've owned the rental property, you've been taking annual depreciation deductions — 1/27.5 of the building value per year for residential, 1/39 for commercial. These deductions reduce your basis and create a "phantom income" tax trap when you sell.

Unrecaptured §1250 gain² is taxed at a maximum rate of 25% — not the 0%/15%/20% long-term capital gains rates. On a property where you've taken $80,000 in depreciation over 10 years, that's up to $20,000 in extra federal tax beyond the capital gains tax. A 1031 exchange defers this entire amount along with the capital gain.

The deferred depreciation recapture carries forward into the replacement property's basis. Eventually — if you die holding the property — your heirs get a step-up in basis under IRC §1014 that eliminates both the capital gain and the accumulated depreciation recapture. This is the classic "defer until death" strategy for real estate investors.

Delaware Statutory Trust: passive 1031 option

Managing a replacement property can be a burden — especially if you're retiring or tired of landlord duties. A Delaware Statutory Trust (DST) is a professionally managed real estate investment that qualifies as replacement property in a 1031 exchange (IRS Rev. Rul. 2004-86). You become a fractional beneficiary of a larger institutional property — an apartment complex, industrial park, or NNN retail center — without any management responsibility.

DSTs are illiquid (typically a 5–10 year hold) and not without risk, but they solve the active-management problem while preserving 1031 deferral. They're also useful when you can't identify a suitable property in 45 days. Many 1031 investors use a DST as a backup identification to protect the exchange even while pursuing a direct property.

When not to use a 1031 exchange

The 1031 exchange is powerful — but it's not always the right move.

• You expect to die holding real estate. The step-up in basis at death (IRC §1014) wipes out your entire deferred gain and depreciation recapture. If your estate planning is set up to transfer the property to heirs, the tax-free step-up may be worth more than a 1031.
• You're in a low-income year with LTCG near 0%. If your taxable income is below $98,900 (MFJ) or $49,450 (single), your long-term capital gains rate is 0%.³ The depreciation recapture at 25% still applies, but spreading a sale across a retirement year with low other income can minimize the remaining tax.
• The replacement property is a poor investment. Don't buy a mediocre property just to defer taxes. Tax deferral has value — but it doesn't justify a bad real estate decision.
• You need the liquidity. A 1031 exchange locks up your capital. If you need cash for another purpose, the tax on a clean sale may be worth paying.