Flathead County Property Tax: Rates, Payment, and Relief

Flathead County property tax is calculated by taking the Montana Department of Revenue’s market value appraisal of your property, applying a state classification rate to get a taxable value, and then multiplying that by the combined mill levies of every local jurisdiction that covers your parcel: the county, your school district, your fire district, and any voter-approved levies. Bills are mailed in October, split into two installments due November 30 and May 31, and several programs can reduce what you owe if you qualify.

What You’ll Actually Be Charged in 2026

Montana overhauled its residential tax rates for 2026. The old flat 1.35% rate is gone, replaced by a graduated structure that charges lower rates on modest homes and higher rates on expensive ones. For a principal residence or qualifying long-term rental, the brackets are tied to the statewide median market value:¹

At or below the median market value: 0.76%
Above the median up to twice the median: 0.90%
Two to four times the median: 1.10%
Four times the median or above: 1.90%

The rates work in brackets, so only the portion of your home’s value above each threshold is taxed at the higher rate. Multifamily rental dwellings with qualifying long-term tenants are taxed at 1.10%, and residences on qualifying agricultural property stay at 1.35%. Short-term rentals, vacation homes, and other residential property that doesn’t qualify for a reduced category are taxed at 1.90%.¹

Once your taxable value is set, each taxing jurisdiction applies its own mill levy. One mill equals one dollar of tax per $1,000 of taxable value, and your bill is the sum of every mill levy that covers your parcel. The Department of Revenue reappraises residential, commercial, and agricultural property every two years at 100% of market value, which is what a willing buyer would pay a willing seller with neither under pressure.²³

When and How to Pay

Flathead County mails tax bills in October. You can also look yours up through the Treasurer’s online property tax portal by address, owner name, or parcel number. If a paper bill never arrives, you’re still responsible for paying on time.⁴

Taxes come in two installments. The first half is due by 5:00 p.m. on November 30, or within 30 days of the postmark on your tax notice if that’s later. The second half is due by 5:00 p.m. on May 31.⁵ If either date lands on a weekend or holiday, you get until the next business day.⁶

For a primary residence, Montana lets you spread the bill over seven roughly equal monthly payments running from November 30 through May 31 instead of paying in two lump sums. The full balance still has to be paid by May 31.⁵

The Treasurer accepts payment online by credit card or electronic check (a processing fee applies), by mail to the Kalispell office, or in person at the counter.⁴ If you’re mailing a payment close to a deadline, ask for a hand postmark at the counter or send it Certified so you have proof of the date.

If your mortgage includes an escrow account, your lender normally collects taxes with your monthly payment and remits them to the county. Watch your bill anyway. The county holds you, not your lender, responsible if an escrow shortage leaves the balance unpaid.⁴

What Happens If You Pay Late

Missing a deadline is expensive right away. The county adds a 2% penalty to the delinquent amount and starts charging interest at 5/6 of 1% per month, roughly 10% annually, running from the delinquency date until paid in full.⁵ Each installment is charged separately, so skipping both the November and May payments means the penalty and interest stack on each one.

If real property taxes stay unpaid into the following summer, the Treasurer attaches a tax lien to the property and files it with the County Clerk and Recorder. A notice goes to your last known address about two weeks before filing. A third party can then buy the lien by paying off the delinquent taxes, penalties, interest, and costs, which transfers the county’s lien rights to that purchaser.

After the statutory redemption period expires, the lien holder can apply for a tax deed and take ownership of the property.⁷ You can redeem the lien at any time before a third party takes an assignment by paying the full delinquent amount plus accumulated penalties and interest. After an assignment, call the Treasurer’s office for a payoff figure. Letting property taxes lapse in Montana is one of the few ways you can lose your home entirely, so a partial payment is better than none.

Programs That Can Lower Your Bill

Montana runs several relief programs for owner-occupied homes. Each has its own application filed with the Department of Revenue, and the deadline is April 15 of the year you first claim assistance.⁸

Property Tax Assistance Program (PTAP)

PTAP reduces the tax rate on the first $350,000 of market value for your primary residence based on household income.⁹ Value above $350,000 is taxed at the standard rate. For 2026:¹⁰

Single filers up to $14,286: 80% reduction
Single filers $14,287 to $19,532: 50% reduction
Single filers $19,533 to $29,037: 30% reduction
Married or head of household up to $19,249: 80% reduction
Married or head of household $19,250 to $29,085: 50% reduction
Married or head of household $29,086 to $38,917: 30% reduction

Disabled Veteran Property Tax Program

Veterans rated 100% disabled for a service-connected condition, or paid at the 100% rate, can qualify for a reduction on their primary residence. At the lowest income levels the program eliminates the tax entirely. The 2026 multipliers:¹¹

Single veteran up to $45,803 (married couple up to $54,963): 0% of normal tax (full exemption)
Single $45,804–$50,384 (married $54,964–$59,544): 20% of normal tax
Single $50,385–$54,963 (married $59,545–$64,124): 30% of normal tax
Single $54,964–$59,554 (married $64,125–$68,705): 50% of normal tax

Surviving spouses of qualifying veterans can also receive a reduction if they remain unmarried and continue to own and occupy the home, with a lower threshold starting at $38,169 for a full exemption.¹¹

Elderly Homeowner/Renter Credit

Montana residents 62 or older with total household income under $45,000 can claim a refundable income tax credit of up to $1,150 for property taxes paid, either directly or through rent.¹² Because the credit is refundable, you get the money even if you owe no state income tax. You don’t have to file a regular income tax return to claim it, but you do need to submit the credit application with proof of income and residency.¹³

Appealing Your Valuation

If you think the Department of Revenue overvalued your property, challenge it. File Form AB-26, a request for informal review, within 30 days of the date on your classification and appraisal notice.¹⁴ If you miss the 30-day window, you can still appeal directly to the county tax appeal board before June 1, 2026.

During the informal review, a department appraiser looks at your property and any evidence you submit, such as recent sales of comparable homes or a professional appraisal. Residential appraisals in the Flathead Valley typically cost a few hundred dollars, and a well-supported appraisal is often the single strongest piece of evidence you can bring. If the result still isn’t right, file a formal appeal with the Flathead County Tax Appeal Board (CTAB), a panel of local citizens appointed to hear property tax disputes.¹⁵

At the CTAB hearing, you and the Department of Revenue get equal time to present exhibits and witnesses.¹⁶ If the county board rules against you, the next step is the Montana Tax Appeal Board (MTAB), an independent state board whose members are appointed by the governor. MTAB decisions are final at the administrative level, with further review available in district court.¹⁵ Documentation is what moves the number: comparable sales data, photos of condition problems, or a licensed appraisal that contradicts the department’s figure. General complaints about high taxes without market evidence rarely result in adjustments.

A Note for Business Owners

Property tax on business equipment is a separate obligation. For 2026, businesses with total statewide market value of business equipment at or below $1 million are exempt entirely, which covers most small operations in the county.¹⁷ If your equipment is worth more than that as of January 1, you have to file a personal property report with the Department of Revenue by February 15, and a late or incomplete report triggers a penalty of 20% of the depreciated taxable market value of the unreported property.¹⁸ The threshold is based on aggregate value across all your locations statewide, not per location, so check your totals before assuming you’re exempt.

1
Montana State Legislature. Property Tax Overview 2025
2
Montana Code Annotated. Montana Code Annotated 15-8-111 – Appraisal — Market Value Standard — Exceptions
3
Montana State Legislature. Montana Code Annotated 15-7-111 – Periodic Reappraisal of Certain Taxable Property
4
Flathead County. Property Tax
5
Montana Code Annotated. Montana Code Annotated 15-16-102 – Time for Payment — Penalty for Delinquency
6
Montana Department of Revenue. Residential Property
7
Montana State Legislature. Montana Code Annotated 15-18-219 – Application for Tax Deed for Residential Property — Fee
8
Montana State Legislature. Montana Code Annotated 15-6-302 – Property Tax Assistance — Rulemaking
9
Montana Code Annotated. Montana Code Annotated 15-6-305 – Property Tax Assistance Program — Fixed or Limited Income — Inflation Adjustments
10
Montana Department of Revenue. Property Tax Assistance Program (PTAP)
11
Montana Code Annotated. Montana Code Annotated 15-6-311 – Disabled Veteran Program
12
Montana Department of Revenue. Montana Elderly Homeowner/Renter Credit
13
Montana State Legislature. Elderly Homeowner and Renter Credit
14
Montana Department of Revenue. Request for Informal Classification and Appraisal Review (Form AB-26)
15
Montana Department of Revenue. Informal Review and Formal Appeal Process
16
Montana Tax Appeal Board. Appeal Process
17
Montana Department of Revenue. Reminder of Personal Property Reporting Requirement
18
Montana Department of Revenue. Personal Property