Property Tax Appeal Deadlines
Deadlines vary by county and are strict almost everywhere. Below are the counties we've verified so far.
Every deadline below is the earliest possible date under that county's rule. Most counties give you until a fixed date OR a set number of days after your own notice was mailed, whichever is later, so your actual deadline could be later than what's shown here. Always confirm with your county assessor.
| County | Earliest deadline | Filing term | Rule |
|---|---|---|---|
| Maricopa County, AZ | Varies, see rule | appeal | A petition must be filed within 60 days after the date the Assessor mails your Notice of Valuation. |
| Alameda County, CA | September 15 | appeal | Appeals of regular assessments must be filed between July 2 and September 15. |
| Contra Costa County, CA | November 30 | appeal | Regular assessment appeals must be filed between July 2 and November 30, per the State Board of Equalization's statewide filing-period listing. |
| Los Angeles County, CA | November 30 | appeal | Filing dates are July 2 to November 30 of each year for all real and personal property assessments. If the final filing date falls on a weekend or legal holiday, a mailed application postmarked on the next business day is deemed timely. |
| Orange County, CA | November 30 | appeal | The annual filing period runs from July 2 through November 30 for regular assessments dated January 1. |
| Sacramento County, CA | November 30 | appeal | Regular assessment appeals must be filed between July 2 and November 30 (Sacramento's Clerk of the Board lists November 30 as the last day; California's default is September 15, extended to November 30 in counties whose Assessor doesn't send assessment notices by August 1, per Revenue & Taxation Code Section 1603). A mailed application postmarked by the last day counts as filed on time, and if that day falls on a weekend or holiday, mail postmarked the next business day is on time. Filing is on paper only: an original signed application at the Clerk of the Board. |
| San Diego County, CA | November 30 | appeal | The Regular Filing Season is open from July 2 through November 30. |
| San Mateo County, CA | November 30 | appeal | The deadline for filing an Assessment Appeal is November 30. |
| Santa Clara County, CA | September 15 | appeal | Regular assessment appeals must be filed between July 2 and September 15 (or November 30 under the conditional extension above). A mailed application postmarked on the last day of the period counts as filed on time; a deadline falling on a weekend/holiday rolls to the next business day. Governed by California Revenue & Taxation Code Section 1603. |
| Broward County, FL | Varies, see rule | petition | A petition must be filed with the Value Adjustment Board on or before the 25th day following the mailing of your TRIM notice by the Property Appraiser. TRIM notices are typically mailed in mid-August. |
| Hillsborough County, FL | Varies, see rule | petition | A petition must be filed with the Value Adjustment Board on or before the 25th day following the mailing of your TRIM notice by the Property Appraiser. TRIM notices are typically mailed in mid-August. The petition must be received, not merely postmarked, by the deadline; a weekend or holiday deadline rolls to the next business day. |
| Miami-Dade County, FL | Varies, see rule | petition | A petition must be filed with the Value Adjustment Board on or before the 25th day following the mailing of your TRIM (Truth in Millage) notice by the Property Appraiser. TRIM notices are typically mailed in mid-to-late August. |
| Palm Beach County, FL | Varies, see rule | petition | A petition must be filed with the Value Adjustment Board on or before the 25th day following the mailing of your TRIM notice by the Property Appraiser's office. TRIM notices are typically mailed in mid-to-late August. |
| Cook County, IL | Varies, see rule | appeal | Cook County has no single filing deadline. Each township has its own Assessor appeal window, which opens when that township's Reassessment Notice is mailed and closes about 43 days later. A separate Board of Review appeal window of about 30 days opens later for each township. Cook County reassesses on a three-year cycle: the City of Chicago in 2024 (next 2027), the north and northwest suburbs in 2025, and the south and west suburbs in 2026. Most properties receive no new notice in a given year. Find your township on the Assessor's calendar. |
| Montgomery County, MD | Varies, see rule | appeal | Appeals on a new reassessment notice must be filed within 45 days of the notice date. Properties not reassessed this year may instead file a Petition for Review by the first working day after January 1. Both routes proceed through the same three levels: Supervisor's Level, the Property Tax Assessment Appeals Board (PTAAB), and the Maryland Tax Court. |
| Kings County, NY | March 15 | appeal | An application must be received by the NYC Tax Commission by March 15 to challenge a Tax Class 1 (one-to-three-family home) assessment, using form TC108. The Tax Commission cannot extend this deadline for any reason. |
| Nassau County, NY | March 1 | grievance | The filing window (commonly called "grievance") for an application for correction of assessment normally runs from early January through March 1 each year, based on that year's tentative assessment roll, filed online through the Assessment Review Commission's AROW system. |
| New York County, NY | March 15 | appeal | An application must be received by the NYC Tax Commission by March 15 to challenge a Tax Class 1 (one-to-three-family home) assessment, using form TC108. The Tax Commission cannot extend this deadline for any reason. |
| Collin County, TX | May 15 | protest | The 2026 protest deadline for real property is May 15, or 30 days after the Notice of Appraised Value was mailed, whichever is later. |
| Dallas County, TX | May 15 | protest | The protest deadline is May 15, or 30 days after a Notice of Appraised Value was mailed to you, whichever is later. If the deadline falls on a weekend or holiday, it moves to the first business day after that date. |
| Harris County, TX | May 15 | protest | Property owners in Harris County have until 5 p.m. May 15, or 30 days after they receive value notices from HCAD, whichever is later, to file protests, unless it falls on a weekend or holiday, in which case the deadline moves to the next business day. |
| Tarrant County, TX | May 15 | protest | The deadline to file is May 15, or 30 days after the date your Notice of Appraised Value was delivered, whichever is later. Your protest deadline date will be clearly marked on your property value notice. |
| Travis County, TX | May 15 | protest | The deadline to file a protest is May 15, or 30 days after the Notice of Appraised Value is mailed, whichever is later. The deadline is the date TCAD receives the protest, not the postmark date. |
| Williamson County, TX | May 15 | protest | The deadline to file a protest is May 15, or 30 days after the Notice of Appraised Value (NOAV) is mailed, whichever is later; if the deadline falls on a weekend or legal holiday it moves to the next business day. |
| Fairfax County, VA | June 1 | appeal | A formal appeal must be received by the Board of Equalization (BOE), an independent body separate from the Dept of Tax Administration, by June 1. If June 1 falls on a weekend or county holiday, the deadline moves to the next business day. |
| King County, WA | July 1 | appeal | The deadline to appeal is the later of July 1st of the assessment year or 60 days from the mailing date printed on the value notice (or other notice of determination). Late filings are almost always rejected. |
| Snohomish County, WA | July 1 | appeal | You must file a completed petition with the Board of Equalization within 60 days of when the change of value notice was mailed, or by July 1st, whichever is later. |
More counties coming
We're adding verified deadline data county by county, not guessing at ones we haven't researched yet. If your county isn't listed above, check your county assessor's site directly.