A property tax appeal is a formal request to lower your home's assessed value, not the tax rate. Here is what you are actually challenging and when.
A property tax appeal is a formal request to lower your home's assessed value. You are not arguing about tax rates or how much you owe in dollars. You are arguing that the number the assessor put on your property is too high, which makes the bill calculated from it too high.
What are you actually appealing, the tax or the value?
The value. Tax rates are set by local budgets (schools, fire districts, libraries, cities, counties) and homeowners cannot appeal those. What you can challenge is the assessed value of your specific home. If that number is wrong, the bill it produces is wrong. Lower the value, lower the bill.
Every county runs an appeal window each year, usually a few weeks or months long. File inside the window with evidence that your value is too high, and an independent review board takes a look.
What does this mean for you?
If your assessment jumped faster than what similar homes on your street actually sold for, or the assessor has the wrong square footage, bedroom count, or condition on file, there is usually a case worth reviewing. A successful appeal lowers the assessed value for that year, which reduces that year's bill. Most jurisdictions reassess annually, so the reduction does not carry forward automatically. The window reopens, and the case starts over. FairAppeal reviews assessments at no cost, and the Fair Appeal review is free.
Related reading: how the process actually works, whether you qualify to appeal, or why your bill is probably too high.