Iowa Homestead Exemption: What New Buyers Must File Before the Deadline

If you bought a home in Iowa in 2026, there's a tax exemption you have to file for yourself. The deadline is July 1 — miss it, and you lose that year's savings. You can file any time after that, but the exemption just applies to the following assessment year instead. Iowa's new homestead exemption reduces your taxable value by 10%, with a minimum of $5,500 and a maximum of $20,000, and most buyers in the Des Moines metro will save several hundred dollars a year once it kicks in.

A lot of buyers close on a house and assume their taxes are just their taxes. The number showed up in the estimate, it came up at the closing table, and now it's somewhere on a calendar. What they don't always realize is that Iowa's property tax system requires you to actively file for the exemptions you're entitled to, and the deadline for the homestead exemption is July 1.

Iowa passed SF 2472 in May 2026, the biggest overhaul to the state's property tax structure in decades. The old homestead credit, which was calculated off a flat dollar amount and varied with your levy rate, is being replaced with the new homestead exemption, which takes 10% of your taxable value off the top before the levy rate is even applied.

For buyers in Polk County, this is the first year the new system is in play. You won't see it reflected on your Polk County Assessor statement just yet, because the 2026 rollback factors and levy rates haven't been finalized. But the exemption applies to the 2026 assessment year, which means the savings show up when those 2026 taxes are due — September 2027 and March 2028. The deadline to file and capture that benefit is July 1.

What Iowa's New Homestead Exemption Actually Does

Iowa property taxes are calculated on your taxable value, not your purchase price or your appraised market value. Your taxable value is your assessed value run through the state's residential rollback factor, which adjusts each year. In Polk County for the 2025 assessment, that rollback was about 44.5%, so a home with an assessed value of $343,700 came out to a taxable value of roughly $153,000.

The new homestead exemption removes 10% of your taxable value from that number before the levy rate is applied. For that same home, that's about $15,300 off the taxable base. In the Des Moines city levy district, at the 2025 levy rate, that exemption reduces the annual tax bill by roughly $650 — compared to the old homestead credit, which for that same parcel was $206. The exact savings vary by levy district, since each city and school district combination carries its own rate. Your county assessor's property search will show your parcel's levy district so you can run the same math on your own home.

The exemption minimum is $5,500 and the maximum is $20,000. The maximum is inflation-indexed starting January 1, 2027. For most buyers in the $250,000 to $600,000 range in the metro, you'll land well within those bounds, which means the 10% calculation applies in full.

Under the old homestead credit, most Polk County buyers were getting $200 to $250 a year. The new homestead exemption, for a home with a taxable value around $150,000, is worth more than twice that.

Who Has to File and When

For new owners, the exemption doesn't apply automatically — you have to file an application with your county assessor's office. If you owned your home before the 2026 reform and already had the old homestead credit, you're being converted to the new exemption automatically, no new application needed. If you're a buyer who closed in 2026 or later, you need to file your own application.

The deadline is July 1 of the year you want the exemption to take effect. If you bought your home in 2026 and filed by July 1, 2026, the exemption applies to the 2026 assessment year. The taxes for that year aren't due until September 2027 (first installment) and March 2028 (second installment), because Iowa property taxes are paid a year in arrears. You're always paying for last year's assessment, which is why your statement may not look any different right now — the 2026 figures haven't been finalized yet. But the filing you do today locks in the benefit for when those taxes come due.

The deadline is July 1 — that's the cutoff for locking in the exemption for that assessment year. Miss it, and you lose that year's savings. But you can file at any time, any month, and the exemption will take effect for the next assessment cycle. You don't have to wait for a new July window. File in August, file in January, file tomorrow — you don’t have to wait for a new July window. If you file after July 1, the exemption applies to the following assessment year, not immediately. The only thing the missed deadline costs you is the one year you didn't file in time.

Most county assessors offer an online application or accept paper forms in person. The form asks for your parcel number, your name, and confirmation that the property is your primary residence. It takes about five minutes. The deadline is the same statewide: July 1.

Polk County or Dallas County? Make Sure You're Filing in the Right Place

Most of the metro falls under the Polk County Assessor. Des Moines, Ankeny, Johnston, Pleasant Hill, Altoona, and Bondurant are solidly Polk County. Waukee is Dallas County. But several cities cross the county line — West Des Moines, Urbandale, Clive, and Grimes all have parcels in both Polk and Dallas counties depending on where in the city the property sits.

Don't rely on the city name alone. If you bought in any of those split cities, search your address on both county assessor websites and confirm which one returns your full parcel record before you file. Filing with the wrong county doesn't count, and there's no way to know from the city name alone which side of the line your parcel is on.

Dallas County homestead exemption applications go to the Dallas County Assessor's office in Adel. Same July 1 deadline, same exemption rules, different office. If you're not sure which county your parcel falls under, your address should pull up under both county assessor property search tools, and only one will show your full parcel record.

The math on the exemption is identical in both counties — 10% of taxable value, $5,500 minimum, $20,000 maximum. The difference is only administrative: who processes your application and who you'd contact if something looks wrong.

New Construction vs. Resale — What the Assessed Value Question Actually Means

The homestead exemption applies to any primary residence, whether you're buying new construction or a resale home. But there's one thing worth understanding before you close: for resale homes, the assessed value already exists. You can look it up on the county assessor's website before you make an offer, run it through the rollback factor, and get a reasonable picture of what your taxable value — and therefore your tax bill — will look like.

For new construction, that picture is less complete. If the home was under construction when the assessor last set values, the assessment on file may reflect only the lot and a partially built structure, not the finished home. Once the county reassesses the completed property, that new assessed value is what the exemption applies to, and it can come in higher than buyers anticipated — because the assessor is evaluating the full home for the first time. That doesn't change whether the exemption applies, but it does mean the 10% calculation lands on a number you won't know until after you close.

If you're buying new construction in Ankeny, Waukee, or anywhere else in the metro, this is worth asking your builder about upfront. Understanding how your county typically assesses new builds in that subdivision helps you plan. It's not a reason to avoid new construction, but it's a real variable that resale buyers can eliminate by doing their homework before they make an offer.

The Right Time to Ask About This Is Before You're Under Contract

Most agents mention the homestead exemption at closing, if they mention it at all. We bring it up earlier, before you're under contract, because the July 1 deadline and the county-by-county filing rules are things buyers need to know before they decide where to buy and when to close, not after they've already signed.

We also remind buyers of the deadline after closing, because life gets busy and July 1 has a way of arriving faster than expected. Missing that window doesn't cost you your exemption forever, but it does cost you a full year.

If you're looking at homes in Des Moines, Ankeny, Waukee, Johnston, or anywhere else in the metro, the best time to talk through costs, taxes, and the full closing picture is before you're under contract, not after.

Call or text Heather Wright & Associates before you sign anything.

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