The last day to appeal property taxes is set by your local jurisdiction, not by any statewide or federal rule, and it is printed on the assessment notice your county or municipality mails you each year. Most places give you somewhere between 25 and 90 days from the date that notice was mailed. Others set a single fixed calendar date that applies to every property owner. Miss the date and you lose the right to challenge your assessed value for the entire tax year.
Find the Date on Your Assessment Notice
The document that starts your appeal clock is the annual assessment notice, sometimes called a Notice of Valuation, Notice of Assessment, or TRIM notice. Somewhere on it you will see language along the lines of “you have X days from the date of this notice to file an appeal” or “appeals must be filed by [specific date].” That is your deadline.
The date that counts is almost always the date the notice was mailed or postmarked, not the day it arrived in your mailbox. If you let the envelope sit unopened for two weeks, those two weeks still come off your window. If the deadline isn’t printed clearly, call the assessor’s office listed on the notice and ask. Being wrong by one day is fatal.
Rolling Deadlines, Fixed Dates, and Hybrids
Jurisdictions structure the appeal window in two main ways. The more common one is a rolling deadline tied to when your individual notice was mailed. Rolling windows range widely: some areas allow as few as 14 or 25 days, others give 60 or 90, and the majority land somewhere between 30 and 60.
The second structure is a single fixed calendar date by which every appeal in the jurisdiction must be filed, regardless of when individual notices went out. Depending on when the local assessment cycle runs, that date can fall anywhere from early winter through late fall. A handful of places use a hybrid: the deadline is either a fixed date or a set number of days after your notice, whichever is later.
If your deadline lands on a weekend or public holiday, most jurisdictions push it to the next business day. Do not assume yours does. Confirm with the assessor’s office.
What Happens If You Miss It
Missing the last day locks in your assessed value for that tax year. These deadlines are jurisdictional, which means the review board loses authority to hear your case the moment the window closes. There is no grace period for slow mail, no exception for not opening your notice, and almost never an extension for personal hardship. Courts consistently uphold the cutoffs because local government budgets depend on assessment finality.
Once the deadline passes, you cannot get a retroactive adjustment or refund for that year. Two narrow options remain. First, if the assessment contains a clear clerical or mathematical error, such as the wrong lot size or a transposed number, many jurisdictions allow the assessor to correct that kind of factual mistake outside the normal appeal window. Contact the assessor’s office and point to the specific error. Second, your next full appeal opportunity comes when the following year’s notice arrives, and the owners who win appeals are typically the ones already prepared when that notice lands.
Filing Before the Deadline
Before filing formally, consider asking the assessor’s office for an informal review. Most counties offer one, and some require it as a first step. During that conversation, staff may correct obvious errors on the spot: wrong square footage, a bedroom that doesn’t exist, a property condition code that doesn’t match reality. If the assessor agrees the value is off, the correction happens without a hearing.
Do not let the informal process eat your filing window. If the deadline is 30 days away and the informal meeting is three weeks out, file the formal appeal first and keep talking informally in parallel. You can withdraw a formal appeal if you reach agreement. You cannot file one after the deadline.
Appeal forms are typically available from the county assessor’s website or the local board of review. Some jurisdictions also accept appeals in person or through an online portal. The form asks for your parcel identification number, the current assessed value shown on your notice, the value you believe is correct, and the grounds for your appeal, most commonly that the assessed value exceeds market value or that your assessment is not uniform compared to similar properties.
How you deliver the appeal matters for deadline purposes. If you mail it, use certified mail with a return receipt, because the postmark date is what counts and you want proof of it. Online portals generate a confirmation number and timestamp that serves the same function. Save that confirmation. If you file in person, get a date-stamped copy of your application before you leave the counter.
Administrative filing fees range from nothing to several hundred dollars depending on the jurisdiction and property type. Check the fee schedule before you file.
Keep Paying Your Tax Bill in the Meantime
Filing an appeal does not pause, reduce, or defer your tax obligation. You still owe the full bill on the normal schedule while the appeal works through the system. If you don’t pay on time, you’ll face late penalties and interest regardless of whether you eventually win.
If the appeal succeeds and the assessed value is reduced, you receive a refund for the amount you overpaid, and some jurisdictions add interest. Refunds only come after a decision, and decisions can take months. Budget accordingly.
The Second Deadline: Judicial Review
If the review board rules against you, that is often not the end of the road, but a second clock starts. Most jurisdictions let you take the dispute to court, typically through a property tax court, a small claims assessment review, or a general civil court depending on where you live. The deadline for filing that judicial challenge is usually 30 to 90 days after the board mails its decision.
Court filings cost more than administrative appeals. Fees can run from $50 for small claims to $250 or more for regular complaints, and many owners hire an attorney or a professional property tax consultant at that stage. Judicial review tends to make financial sense only when the potential tax savings justify the expense, which is why it appears more often with commercial properties than residential ones.
Mark the Next Notice the Day It Arrives
Whether you are appealing this year or waiting for next, treat the annual notice as a time-sensitive legal document. Open it the day it arrives. Write the filing deadline on your calendar immediately. Pull together your comparable sales, photos, or appraisal well before the window closes rather than in the final week. The deadline is the one part of a property tax appeal that no evidence, argument, or hardship can move.