Idaho property tax bills go out in late November, and the deadline is December 20. In 2026 that's a Sunday, and Idaho moves the deadline to the first business day after — Monday, December 21, 2026.
Idaho gives you a choice that many states don't: pay the whole year by December 21, or pay half now and half later.
Full Payment or Two Halves
- ›Pay in full by December 21 and you're done for the year.
- ›Pay the first half by December 21, and the second half is due June 20, 2027. That's a Sunday too, so the second-half deadline moves to Monday, June 21.
There's no discount for paying in full and no extra charge for splitting it — the split is simply a free way to spread the cost across two budget cycles. If your December is already stretched, paying half is a perfectly reasonable choice.
What Late Payment Costs
If a payment is late, Idaho Code adds a 2% late charge on the delinquent amount, plus interest of 1% per month starting January 1 of the following year. A first-half payment missed in December accumulates interest until it's paid. Leave it long enough — three years of delinquency — and the county can begin the tax deed process.
Check Your Exemptions Before You Pay
Idaho's homeowner's exemption reduces the taxable value of an owner-occupied primary residence, and it should already be on your bill if you've applied. If you bought your home this year and don't see the exemption, contact your county assessor now — it doesn't apply automatically.
Lower-income homeowners, seniors, widows and widowers, and people with disabilities may also qualify for Idaho's property tax reduction program (sometimes called the circuit breaker), which can cut the bill substantially. Applications for the next year's benefit are made through the county assessor in the spring, so if you think you might qualify, mark your calendar now.
Escrowed Homeowners
If your mortgage has an escrow account, your lender typically pays the full year in December. You can confirm it posted on your county treasurer's site after the deadline.
Find your county treasurer and payment options on our Idaho property tax page, including Ada County.