A property tax bill is set by two separately-controlled numbers — an appeal can only change one of them, and this isolates exactly what that change is worth.
How it works
The current tax and a hypothetical appealed tax are both computed by applying the same mill rate to two different assessed values — the mill rate itself, set by local taxing bodies, is unaffected by an assessment appeal.
What this does not include
This doesn’t estimate the odds of winning an appeal or the target value likely to be granted — it computes savings for whatever target value is entered, which should come from comparable-sales research or an appraisal, not a guess.
How to use this calculator
- Enter the current assessed value and a target value if the appeal succeeds.
- Enter the local mill rate.
Frequently asked questions
What’s the difference between assessed value and market value?
Assessed value is often a percentage of market value set by local assessment practice — the two aren’t always the same number, which is part of what an appeal can challenge.
Does winning an appeal lower future years’ assessments too?
Not automatically — many jurisdictions reassess periodically, so a successful appeal may need to be revisited if the assessor raises the value again in a future cycle.
Does an appeal affect the mill rate?
No — the mill rate is set independently by local taxing bodies (schools, municipalities) based on their budget needs; an individual assessment appeal has no effect on it.
