What is the Iowa rollback?

The rollback, formally the assessment limitation, is a statewide percentage that reduces a property's assessed market value to its taxable value. It exists to limit how fast statewide taxable values can grow (capped near 3% a year). For residential property the rollback is roughly 46.3% for taxes payable in FY2025, so only about 46 cents of every assessed dollar is actually taxed.

How is Iowa property tax calculated?

Iowa multiplies your market value by the rollback to get taxable value, subtracts any homestead exemption, then multiplies the result by the consolidated levy expressed in dollars per $1,000 of taxable value. The consolidated levy combines city, county, school, and other district rates for your exact location.

What is the consolidated levy?

The consolidated levy is the total of all local taxing-district rates that apply to your property — city, county, school district, community college, and others — stated as dollars per $1,000 of taxable value. It typically ranges from the low $30s to the low $40s per $1,000 across Iowa, with high-service cities at the upper end.

What is the Iowa homestead exemption?

Iowa gives owner-occupants a homestead credit that reduces taxable value, and a newer homestead exemption of $6,500 for residents aged 65 and older on top of the standard credit. This calculator lets you enter a homestead exemption amount so you can match the credit your county applies; the default approximates the standard homestead credit.

Is this property tax estimate exact?

No, it is a planning estimate. The rollback changes every year, the consolidated levy varies by exact location and is recertified annually, and homestead and other credits differ by county and household. Use your assessment notice and county assessor's figures for an exact bill.

Iowa Property Tax Estimator — Rollback + Levy

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This estimator calculates Iowa property tax using the state’s distinctive two-step system: the rollback (assessment limitation) that shrinks your market value to a taxable value, and the consolidated levy charged per $1,000 of that taxable value. It is built for Iowa homeowners checking a tax bill, budgeting for a purchase, or comparing cities.

How it works

Iowa does not tax full market value. It first applies the rollback, then the levy:

Taxable value = Market value × rollback

Net taxable = Taxable value − homestead exemption

Annual tax = Net taxable × consolidated levy ÷ 1,000

For residential property the rollback is about 46.3% for taxes payable in FY2025, so most of your assessed value is excluded before any levy is applied.

Iowa property tax details

Two things make Iowa property tax unusual. First, the rollback caps statewide taxable-value growth near 3% a year, which is why your taxable value is far below your market value. Second, the consolidated levy rolls every local district — city, county, school, and more — into a single dollars-per-$1,000 figure that varies by exact address. Owner-occupants also get a homestead credit, plus a $6,500 exemption for residents 65 and older.

Worked example

A $250,000 home, residential class (46.3% rollback), $4,850 homestead credit, in Des Moines (~$40/$1,000):

Taxable value = $250,000 × 46.3% = $115,750
Net taxable = $115,750 − $4,850 = $110,900
Annual tax = $110,900 × $40 ÷ 1,000 ≈ $4,436

Note: The rollback and levy change yearly and vary by location. Use your county assessor’s figures and assessment notice for an exact bill.