Assessed Value vs. Market Value in Iowa: What Sellers Miss

Your assessed value is the county's tax-year estimate of your home's worth, set as of January 1. Your market value is what a real buyer will pay for it now. In Iowa the two are often thousands of dollars apart, and the assessment can land above or below the price your home finally sells for.

Every homeowner in the metro gets the letter. Ankeny, Waukee, Johnston, West Des Moines, Urbandale, Clive, it doesn't matter which suburb, the county mails you a number and calls it the value of your home.

Most people read it as a verdict. It isn't. It's a tax figure, produced by a computer, frozen on a date months in the past. And when it's time to sell, that number is one of the first things people anchor to, usually to their own cost.

Here's what the assessment measures, what it leaves out, and why the number that matters when you sell is one the county can't give you.

What Is Assessed Value in Iowa?

Your assessed value is what the county assessor says your property was worth as of January 1, and it exists so the county can split up the property tax bill fairly. By law, residential property in Iowa is supposed to be assessed at market value, and the state checks that assessments across a jurisdiction land within 5% of what homes are selling for. Homes get reassessed every two years, in odd-numbered years, and the notice arrives around April 1.

Now the part that trips sellers up. The assessor is not walking through your kitchen. That number comes from a mass appraisal — a model that looks at your square footage, your home's age, and recent sales across your area, then leans on sales-ratio studies to check itself against the wider market. It's built to be fair across thousands of homes at once. It is not built to price your specific house in the week you decide to sell.

That's a real difference in purpose, not a knock on the assessor. Their job is a fair tax base. Your job, when you sell, is a top-dollar sale. Those two jobs produce two different numbers.

What Is Market Value, and Why Is It Different?

Market value is what a willing buyer pays a willing seller in a live negotiation. It sees everything the model can't. Your real condition, the updates you've done and the ones you skipped, the street you're on, the school, how the backyard feels at 6pm, how many homes like yours are competing that month, and how badly one buyer wants yours over the others.

The assessment is a snapshot from January 1. The market moves every week. A home that penciled out as a $340,000 comp in January can sell for less by June if three similar homes hit the market at once, or more if a buyer falls for it and there's nothing else to choose from. The county's number can't react to any of that. A buyer can, and does.

This is also why a home can sell well above its assessment or well below it. High or low isn't the point. Different is the point.

The county sets a value for taxes. A buyer sets the value for your bank account. Those are two different jobs, and only one of them shows up at closing.

Assessed Value vs. Market Value: How They Compare

Both get called "value," which is the whole problem. People treat them as one number. They aren't, and pricing your home off the wrong one is how a good house ends up sitting.

Which Number Is Even on My Tax Bill?

This is where it gets confusing, because there are three numbers floating around, not two, and people quote the wrong one all the time.

Your taxable value is what shows up on your tax statement. It's your assessed value cut way down by a statewide rollback — an assessment limitation that keeps total taxable value across Iowa from growing more than 3% a year. That rollback changes every year. For 2025 the residential figure ran about 44.5%, so a home assessed at $300,000 showed only roughly $133,500 in taxable value on the tax statement. That's the number the tax rate is applied to.

Your assessed value is the county's January 1 market estimate, the figure on your assessment notice.

Your market value is what your home sells for.

Three numbers. Only the last one is money a buyer hands you at closing, and the county can't tell you what it is.

The Clive Ranch That Sold for $33,000 Under Its Assessment

Last year we represented the buyers on a ranch in Clive. On paper, the county liked the house. It was assessed at $353,200, and the seller listed it in mid-May at $349,900, right up against that assessment.

Then it sat.

The condition was fine — updated in spots and dated in others, about like everything else in the neighborhood. But the home was in a flood plain, which meant required flood insurance and a real monthly cost stapled to every buyer's payment. The market had also cooled that summer. The county's model knew about none of that. Buyers knew about all of it.

The house was on the market for 117 days. The seller cut the price twice, down to $329,900. Our buyers bought it for $320,000. That's $33,200 under what the county said the home was worth, and it happened because a real buyer priced in the flood insurance and the slowdown that no assessment ever will.

Had that seller listed at what the home would sell for instead of what the assessment said, they'd have spent a lot less than 117 days learning this lesson. We watch this happen from both sides of the table. The assessment is a fine place to start a conversation. It's a terrible place to set a price.

When Each Number Matters

Both numbers are useful. They're just useful for different jobs.

Assessed value matters when:

• You're checking whether your property taxes look fair
• You're deciding whether to protest your assessment with the Board of Review
• You're comparing your assessment against similar homes nearby to spot an error

That's the lane the county number belongs in. Taxes, fairness, and appeals.

Market value matters when:

• You're setting a list price
• You're deciding whether to accept an offer
• You're a buyer working out what to offer

For any of those, the assessment is noise. What moves the decision is current, comparable sales in your specific pocket, adjusted for your home's real condition and what's on the market right now.

Should You Appeal Your Assessment?

Different question, and worth a minute. If you think the county's number is higher than what your home would sell for, you can protest it. The assessment calendar runs on a set schedule.

Notices go out around April 1. That's your window opening. Read the number and ask the assessor's own test: could you sell this home for that today?

Informal review comes first, early April. You can talk it through with the assessor directly, and often that's where a clear error gets fixed without a fight.

A formal protest goes to the local Board of Review, April 2 through April 30. In odd-numbered equalization years there's a second window in the fall. The board is made up of local people familiar with the market, and it can move your assessment up or down.

One thing to keep straight if you're thinking about selling: a high assessment does not let you list high, and a low one does not cap your price. The county's number and your sale price live in separate worlds. Price to the market, not to the notice.

Frequently Asked Questions