1031 Exchange Rules in Montana

Last reviewed: June 2026. State rules change. Verify current forms before closing.

What Is Different in Montana

Montana makes closing day easy and the long game complicated. There is no nonresident withholding at closing and no exemption form to file — your exchange closes clean. But Montana is one of only four states with a claw-back rule: gain realized on the transfer of Montana property in a like-kind exchange keeps its Montana-source character, and Montana may tax that deferred gain when you later recognize it — even if your replacement property is in another state. Unlike California and Oregon, Montana imposes no annual tracking form. The obligation simply waits.

Does Montana Conform to IRC Section 1031?

Yes. Montana follows the federal like-kind exchange rules for real property. A 1031 exchange is an IRS-approved way to sell investment property and buy replacement property without paying tax on the gain right away. If your exchange qualifies for federal deferral, Montana defers its income tax too. New to exchanges? Start with our 1031 exchange guide.

Your replacement property can be in any state. The catch comes later — see the claw-back section below.

Montana Tax Rate on Real Estate Gains

Montana’s top income tax rate is 5.65% for 2026. On a $500,000 gain, that is roughly $28,250 of state tax in addition to the federal bill. A qualifying exchange may defer all of it — and continued exchanges continue the deferral until gain is finally recognized.

No Withholding at Closing

Montana imposes no real estate closing withholding on nonresident sellers. There is no exemption certificate to request, no affidavit to sign, and no payment held back at the closing table. For the mechanics of the exchange itself, federal rules govern: a qualified intermediary must hold your sale proceeds, and the 45-day and 180-day deadlines apply. A qualified intermediary is the independent party that holds your sale proceeds during an exchange.

The Montana Claw-Back: Deferred Gain Stays Montana-Source

Under ARM 42.2.304, gain realized on the transfer of Montana property in a like-kind exchange retains its character as Montana-source income. When that deferred gain is recognized in a later taxable transaction — say you sell the replacement property in a straight sale years from now — Montana may tax the portion of the gain that accrued on the Montana property, even though the replacement property sits in another state.

What this means in practice:

• Exchange Montana land for Texas land, later sell the Texas land: the deferred Montana gain becomes reportable to Montana in the year you recognize it.
• Keep exchanging: deferral continues. The claw-back only bites when gain is actually recognized.
• No annual form. Montana has no California-style FTB 3840 equivalent and no Oregon-style annual schedule. Nothing is filed in the interim years — the reporting obligation arises in the year of recognition.

Only four states claw back deferred gain this way: California, Oregon, Montana, and Massachusetts. Montana’s version is the quietest, which makes it the easiest to forget. Keep records of your Montana basis and deferred gain for as long as the exchange chain runs.

Federal Taxes Still Apply

A Montana exchange defers two layers: federal and state. Here is what a taxable sale looks like without an exchange, using round numbers.

Example: $1,000,000 sale of a Montana rental. Original purchase $600,000, with $100,000 of depreciation taken, so the adjusted basis is $500,000 and the total gain is $500,000.

Figures are illustrative and rounded. Your rates depend on income, filing status, and basis. A qualifying 1031 exchange may defer the entire amount. Run your own numbers with our 1031 exchange calculators, then confirm them with your tax advisor.

Risks and Things That Go Wrong in Montana Exchanges

• Forgetting the claw-back. No annual form means no annual reminder. Investors who exchange out of Montana and sell the replacement property a decade later are often surprised by a Montana return obligation in the year of recognition.
• Losing track of Montana-source gain. Across multiple exchanges, you must be able to compute how much of the eventual recognized gain traces to the original Montana property. Keep the closing statements and exchange records permanently.
• Assuming no withholding means no state tax. Montana taxes the gain when recognized; closing without withholding is a timing convenience, not an exemption.
• Boot surprises. Cash taken at closing or mortgage relief not offset with new debt or additional cash becomes recognized gain — taxable federally and reportable to Montana now, not later.
• Failed deadlines. The federal 45-day identification and 180-day completion rules apply with no state extensions. See the IRS rules for 1031 exchanges.
• Deferral is not elimination. The IRS and Montana will tax the deferred gain when you eventually cash out. Plan the exit, not just the exchange.

Montana 1031 Exchange FAQs

Does Montana withhold tax when I sell investment property?
No. Montana has no nonresident real estate withholding at closing and no exemption form to file.

Can I exchange my Montana property for property in another state?
Yes. Replacement property can be anywhere in the U.S. But the deferred Montana gain retains Montana-source character and may be taxed by Montana when you later recognize it.

Does Montana require annual reporting of deferred gain like California?
No. There is no annual tracking form. The deferred gain is reported to Montana in the year it is actually recognized in a taxable transaction.

What if I keep exchanging and never sell for cash?
Deferral continues through successive exchanges. Montana’s claw-back applies only when gain is recognized.

What records should I keep?
Closing statements, exchange agreements, and basis calculations for the original Montana property — for as long as the deferral chain runs, however many exchanges that spans.

Sources

• Mont. Admin. R. 42.2.304 (Montana-source income; like-kind exchanges)
• Mont. Code Ann. 15-30-2101
• Mont. Admin. R. 42.2.308 (like-kind exchange calculations)
• Tax Foundation, State Individual Income Tax Rates and Brackets, 2026

Want to learn more? Our 1031 exchange guide covers the full process from sale to replacement. Ready to start a Montana exchange? WealthBuilder 1031 is attorney-owned, serves all 50 states, and charges a flat $1,000 fee. Start at WealthBuilder1031.com or call 888-508-1901.

This page does not constitute legal or tax advice. Consult your attorney and tax advisor about your specific situation.

Ready to start your Montana 1031 exchange? WealthBuilder 1031 acts as your qualified intermediary for a flat $1,000 fee, $750 at your sale and $250 at your purchase. See our Montana 1031 exchange services to get started.