Johnson County property tax appeals
Appeal Season is a property tax appeal co-pilot. We are expanding county by county to high-tax areas like Johnson County. We are not there yet, so we cannot check a Iowa assessment today. Leave your email and we will tell you the day we cover Johnson County, and nothing else.
Iowa assesses your home at market value and you protest to your local board of review between April 2 and April 30. The residential rollback caps statewide growth, not your individual home, so winning a protest still lowers your bill.
- Your assessed value is higher than what your home would actually sell for.
- The record has an error in your home's size, condition, or features.
- You file with your local board of review between April 2 and April 30.
- Your assessed value already matches what your home would sell for. A protest reviews your value, not your tax rate.
- You miss the April 30 window. The protest period is set by statute and closes for the year.
Read the full explanation
In Iowa, your assessor sets your home's assessed value at what it would sell for, and you protest that value to your local board of review between April 2 and April 30. After the assessed value is set, the state applies a residential rollback that decides how much of it is actually taxed. The rollback limits how fast the total taxable value of all Iowa homes grows statewide, not how fast your own home's value grows, so it does not blunt an appeal. Your assessed value is the starting point the rollback is applied to, which means winning a protest still lowers your bill. An appeal makes sense when your assessed value is higher than what your home would sell for, or when the record has an error. It will not help when your assessed value already matches the market and you simply disagree with the tax rate. This is general information, not tax advice.
Source: Iowa Legislature, Iowa Code 441.37 · checked 2026-07-19. We're preparing coverage here and will publish Johnson County's own verified schedule once our review of the county's records is complete.
- 2026 filing deadline:
- Thursday, April 30, 2026. That window has closed for this year.
- Filing window:
- File a written protest with your local board of review between April 2 and April 30 of the assessment year (Iowa Code 441.37). April 30, 2026 is a Thursday, so no shift applies. Iowa assesses at market value, and the statewide residential rollback is applied after your assessed value is set, so lowering your assessed value still lowers your bill.
- Where to file:
- Local board of review
- Filing fee:
- Contact your local board of review to confirm any filing fee.
Verified against official sources, approved 2026-07-19.