September Property Tax Deadlines by State: What's Due This Month
TL;DR
September marks the start of California's Assessment Appeals Board filing window (September 15 - November 30) and Utah's Board of Equalization deadline (September 15). Louisiana's protest period runs through September in many parishes. Payment deadlines hit in Alabama (October 1 coming up), Maryland (September 30), Delaware (September 30), and West Virginia (September 1). If you are in California, September 15 is the day your appeal window opens. Be ready to file.
September Appeal Deadlines
| State | Deadline | Where to File |
|---|---|---|
| California | September 15 (filing window opens) | County Assessment Appeals Board |
| Utah | September 15 | County Board of Equalization |
| Louisiana | 15 days after assessment rolls open | Parish Board of Review |
| Delaware | Varies by county | County Board of Assessment Review |
Key September Deadlines Explained
California - September 15 (Window Opens)
California's Assessment Appeals Board filing window opens September 15 and closes November 30. This is a generous window compared to most states, giving you 2.5 months to file.
California's Proposition 13 limits annual assessment increases to 2% for properties that have not changed hands. If your assessment increased by more than 2% and you did not buy the property, add construction, or make major improvements, the assessor may have exceeded the legal limit.
California is also one of the few states where a declining market can push your assessment below the Prop 13 base value (a "Prop 8 reduction"). If your home's current market value is less than its Prop 13 factored base year value, you can request a temporary reduction.
To file in California:
- Get the Assessment Appeal Application from your county clerk or assessor's website
- Complete the application with your property details, current assessed value, and your opinion of value
- File between September 15 and November 30
- You will be scheduled for a hearing, typically 6-12 months later (California has significant backlogs in some counties)
Utah - September 15
Utah homeowners must file with the county Board of Equalization by September 15. Assessment notices arrive in July-August. Utah assesses at 100% of fair market value for residential property.
If your assessed value is higher than what comparable homes are selling for, gather 3-5 recent sales and file your appeal.
Louisiana - 15 Days After Rolls Open
Louisiana assessment rolls open for inspection in August-September, depending on the parish. You have 15 days from the date the rolls open to file a protest. The window is tight and varies by parish, so check with your local assessor for exact dates.
September Payment Deadlines
| State | What Is Due | Date | Notes |
|---|---|---|---|
| Maryland | First installment or full payment | September 30 | Second installment due December 31 |
| Delaware | Tax payment | September 30 | Penalties apply after this date |
| West Virginia | First installment | September 1 | Second installment due March 1 |
| Iowa | First installment | September 30 | Second installment due March 31 |
| North Carolina | Tax payment | September 1 (varies) | Some counties have different deadlines |
What to Do in September
If You Are in California
September 15 is your filing date. If you prepared during August, you are ready to go:
- File on September 15. Early filers often get earlier hearing dates, which matters in counties with long backlogs.
- Include strong comps. California hearings are heard by a three-person panel. They want to see comparable sales that demonstrate your value should be lower.
- State your opinion of value clearly. Be specific. "I believe my property's market value is $X based on these comparable sales" is better than "my value is too high."
If You Are in Utah
September 15 is your deadline. If you have not filed yet:
- Pull comparable sales today
- Complete the appeal form
- Submit before September 15
If You Are Paying This Month
Several states have September payment deadlines. Make sure to:
- Verify the amount on your bill matches your assessment notice
- Pay on time to avoid penalties (typically 1-2% per month)
- Keep your receipt or confirmation
Preparing for Fall Deadlines
The remaining fall deadlines include:
- New Jersey Tax Court: October 1
- Oregon: December 31 (Board of Property Tax Appeals)
- Alabama: 30 days after notice (notices arrive October-November)
- Philadelphia: October 7
If your deadline is coming in October or November, use September to prepare your evidence. Research comps, document condition issues, and have your appeal form ready to file.
The California Backlog
California is notorious for long wait times between filing and hearing. In large counties like Los Angeles, the wait can be 12-18 months. In smaller counties, it may be 3-6 months.
While you wait:
- Your current assessment remains in effect and you pay taxes based on it
- If you win, you receive a refund for the overpayment period
- Continue to track comparable sales in case you need updated evidence at the hearing
The long wait is frustrating, but the potential savings over multiple years make it worthwhile.
Your Next Steps
Put this information to work this week:
- Review your assessment notice. Check every detail: assessed value, property characteristics, square footage, lot size. Errors are more common than you think and they directly inflate your tax bill.
- Pull comparable sales. Find 3 to 5 similar properties near you that sold recently for less than your assessed value. This is the strongest evidence for any appeal.
- Check your exemption status. Contact your county assessor to confirm which exemptions are on file for your property. You may qualify for programs you have not applied for.
- Set a deadline reminder. Find your appeal deadline and put it on your calendar with a 2-week advance warning. Missing it costs you a full year of potential savings.
Staying Ahead of the Calendar
Property tax deadlines are spread throughout the year, and it is easy to lose track. The homeowners who save the most money are the ones who treat their assessment notice as a trigger for action, not something to file away and forget.
When your notice arrives, open it the same day. Check the assessed value against what you believe your home is worth. If the number looks too high, start gathering comparable sales immediately. Do not wait until the week before the deadline. The best appeals are built over weeks, not hours.
If you are in a state with quarterly tax payments, set reminders for each installment date. Late payment penalties add up fast and are entirely avoidable with basic calendar management.
Try our free tools
Frequently Asked Questions
How should I prepare for September property tax deadlines by state: what's due this month?
September marks the start of California's Assessment Appeals Board filing window (September 15 - November 30) and Utah's Board of Equalization deadline (September 15). Louisiana's protest period runs through September in many parishes. Payment deadlines hit in Alabama (October 1 coming up), Maryland (September 30), Delaware (September 30), and West Virginia (September 1).
What are the key September property tax deadlines I should know about?
California's Assessment Appeals Board filing window opens September 15 and closes November 30. This is a generous window compared to most states, giving you 2.5 months to file.
What to Do in September?
California is notorious for long wait times between filing and hearing. In large counties like Los Angeles, the wait can be 12-18 months. In smaller counties, it may be 3-6 months. While you wait, you should file on September 15, as early filers often get earlier hearing dates, which matters in counties with long backlogs. Include strong comparable sales that demonstrate your property value should be lower.
When are the property tax deadlines in California and Utah?
September 15 is the deadline for the California Assessment Appeals Board filing window and the Utah Board of Equalization deadline. PropertyTaxFight can help you build your evidence packet with comparable sales and assessment analysis, so you're ready to file the moment the window opens.
How can I prepare for the September property tax deadlines in California and Utah?
September 15 is the date for the California Assessment Appeals Board filing window and the Utah Board of Equalization deadline. PropertyTaxFight can help you build your evidence packet with comparable sales and assessment analysis, so you're ready to file the moment the window opens.