Gallatin County, MT property tax deadlines
5 coming property tax dates for Gallatin County, Montana. Each one links to its official source and shows the day LevyDay last checked it.
| Next dates | Bills due | Last day without penalty | Appeal by | Exemption filing |
|---|---|---|---|---|
| Gallatin | May 31, 2027The last day without penaltyState rulesee source | May 31, 2027gallatinmt.govOct 24 | Set by noticeState rulesee source | Apr 15, 2027revenue.mt.govJul 10 |
Deadlines in date order
| Date and source | Deadline |
|---|---|
| April 15 every yearrevenue.mt.govJul 10 | Exemption filing Property Tax Assistance Program (income-based) |
| May 31, 2027 2027 onlygallatinmt.govOct 24 | Last day without penalty 2026 second half due |
| Varies, see rule set by noticeState rulesee source | Appeal deadline Appeal to the County Tax Appeal Board The county clerk and recorder must get it within 30 days of the date on the Department of Revenue's value notice, or of its informal review decision. You get one appeal every two-year cycle. |
| Varies, see rule see ruleState rulesee source | Bills due Bills due by the last day without penalty Pay the first half by November 30 and the second half by May 31 of the next year. |
| Varies, see rule set by noticegallatinmt.govOct 24 | Last day without penalty 2026 first half due 30 days from the date on the 2026 bill. Bills hadn't gone out when we last checked. |
Appealing your assessed value
Appeal by the date on your noticeState rulesee source
If you think the county valued your home too high, you can appeal. Filing with the county is free and you can do it yourself.
Get help filing an appeal
After you send your details, we look for an independent appeal firm or attorney to take your case. We'll be in touch once one has agreed. Firms usually charge a share of what you save, and the one that takes it may pay LevyDay a referral fee.
LevyDay doesn't file appeals or give legal or tax advice. We only pass your details on. The independent firm or attorney that takes your case does the work and sets its own fee.
Get help filing an appealIf you pay late
- Paying late: Under Montana law, late taxes get a 2% penalty plus interest of 5/6 of 1% a month.
Free reminders from the county
- Gallatin County sends property tax reminders by text message or email if you sign up for its Tax Reminder Service with your parcel number. Sign up with the county
Official offices
Places in Gallatin County
They are: Amsterdam, Belgrade, Big Sky, Bozeman, Bridger, Churchill, Four Corners, Gallatin Gateway, Gallatin River Ranch, Hebgen Lake Estates, King Arthur Park, Logan, Manhattan, Ponderosa Pines, Sedan, Springhill, Three Forks, West Yellowstone, Willow Creek. Every place in the county gets the dates above.
Nearby in the Montana list
DanielsDawsonDeer LodgeFallonFergusFlatheadGarfieldGlacierGolden ValleyGraniteHillJefferson