How to Claim Idaho's Homeowner's Exemption in Ada and Canyon Counties
If you own and live in your home anywhere in the Treasure Valley: Boise, Meridian, Eagle, Kuna, Star, Nampa, Caldwell, Middleton, or the smaller towns out toward Parma and Melba — there is a property tax break sitting on the table that a surprising number of new owners never claim. It is called the homeowner's exemption (the statute now calls it the homestead exemption), and it can cut the taxable value of your home nearly in half.
It is not automatic. Nobody at the title company files it for you. Here is exactly how it works, what changed in 2026, and how to file with the Ada County and Canyon County assessors.
What the exemption actually does
Idaho exempts 50% of the assessed value of your owner-occupied primary residence, up to a maximum of $125,000, whichever is less. It covers the house and up to one acre of land. The reduction comes off your assessed value before the levy rates are applied, so it flows straight through to a lower bill.
Two quick examples of how the math lands:
A $400,000 home in Nampa. Half of $400,000 is $200,000, which is more than the cap, so you get the full $125,000. You are taxed on $275,000.
A $220,000 condo in Boise. Half of $220,000 is $110,000, which is under the cap, so the exemption is $110,000. You are taxed on $110,000.
The $125,000 cap has been fixed since 2021 and stays there until the Legislature changes it. It is set in Idaho Code §63-602G.
Also worth knowing: the exemption applies to the home and one acre only. A shop, a barn, or the extra four acres on your Middleton place do not get the reduction.
What changed in 2026 — proration is gone
This is the part most articles on the internet still have wrong.
For a couple of years, Idaho prorated the exemption if you applied after April 15. File in May and you got 75% of it. File in August and you got 50%. Some county websites still show that quarterly table.
House Bill 843, signed March 31, 2026 and retroactive to January 1, 2026, eliminated proration entirely. Under the current law and the Idaho State Tax Commission's April 2026 guidance to assessors:
There is no proration regardless of when you file during the calendar year.
To be eligible for the current tax year, you must file before the close of business on the last business day of the year.
If you file after the second Monday in July, the full value stays on the property roll, but the county issues a tax cancellation equal to the exemption you would have received. Same benefit, different mechanics.
Practical translation: if you bought a house in Kuna in October and nobody told you about this, you are not out of luck. File before the end of the year and you still get the full exemption for that year.
You should still file the day you are eligible. Later filings mean more paperwork on the county's end, more chances for something to fall through a crack, and if you are counting on the Homeowner's Tax Relief credit, the second Monday in July still matters (more on that below).
Who qualifies
Two conditions, both of which have to be true:
You own the property. Deeded ownership, or beneficial ownership through a trust, LLC, partnership, or corporation.
You occupy it as your primary dwelling place. Idaho defines that as your true, fixed, permanent home — the place you intend to return to whenever you are away.
You can only claim the exemption on one property, in one county, statewide. The Tax Commission maintains a searchable database of active exemptions specifically to catch people claiming two.
Rentals, vacation properties, the cabin in McCall, and your investment duplex do not qualify. A home office inside your primary residence does not disqualify you.
Once approved, you do not reapply every year. You only need to file again if ownership changes, you move, or you record a new deed.
How to apply in Ada County
The Ada County Assessor takes applications online, which is by far the fastest route.
Step 1 — Get your parcel number. Use the Assessor's property search by address on adacounty.id.gov
Step 2 — Apply online. The online homestead exemption application is on the Assessor's site. Your Idaho driver's license number validates your identity in place of a signature. If you do not have an Idaho license or ID, you will need to print, sign, and return the form by mail, email, or fax — digital signatures are not accepted.
Step 3 — Or file on paper. Download the form from the Assessor's documents and forms page, or call the office and ask them to send one. Return it to: Ada County Assessor 190 E. Front Street, Suite 107 Boise, ID 83702 (208) 287-7200
👉 🛑 Step 4 — Save your receipt. 🛑 Online filers get one automatically. Everyone else can request one. Note that a receipt confirms the county received your application — it is not proof of approval.
Step 5 — Verify on your assessment notice. Ada County does not mail approval notices. Check your annual assessment notice in late spring, and look for the exemption on your November tax bill. If something looks wrong, call (208) 287-7200.
You will be asked for your full name, date of birth, current address, most recent previous address, and your Idaho driver's license or state ID number. Active-duty military members are exempt from the ID requirement on the initial application.
How to apply in Canyon County
Canyon County also has an online application, at apps.canyoncounty.id.gov.
Step 1 — Wait for the deed to record and post. Canyon's application pre-populates with parcel and ownership information, but only after the recorded deed has been worked into the county system. Depending on volume, that can take up to a month after closing. You can check status in the county's parcel information database.
Step 2 — Apply online HERE , or request a form by emailing 2cAsr@canyoncounty.id.gov.
Step 3 — Return it to the Assessor if filing on paper:
Canyon County Assessor 111 N. 11th Avenue, Suite 250 Caldwell, ID 83605 (208) 454-7431 2cAsr@canyoncounty.id.gov
Step 4 — Watch for your receipt in the mail. Canyon County mails a receipt when an application is approved. Keep it for as long as you own the home. Do not assume you have the exemption until that receipt arrives.
Step 5 — Check your assessment notice, which Canyon County mails in May for most property types. If the net taxable value equals the total assessed value, there is no active exemption on the parcel — call the Assessor before the appeal deadline printed at the top of the notice.
One Canyon-specific note the county calls out: the exemption takes effect on the date of a completed application. If the prior owner had an exemption and did not claim one elsewhere that year, theirs may stay on the parcel through the end of the calendar year. Do not rely on that. File your own.
