2026 Property Tax Due Dates
Installment 1
November 30
First installment
Installment 2
May 31
Second installment
Penalty: 2% penalty + 10% interestGrace period: None
Payment Methods
Online, Mail, In-Person
Flathead County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Flathead County Treasurer
In Person
Visit the Treasurer's office — 290 A North Main, Kalispell MT 59901, Mon-Fri 8am - 5pm
Other Counties in Montana
About Flathead County
Flathead County is a county located in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you 2 weeks before your property taxes are due.
Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.