May Property Tax Deadlines by State: What's Due This Month
TL;DR
May is the single biggest month for property tax appeal deadlines. Texas protests are due May 15 (or 30 days after notice). New York's Grievance Day falls on the third Tuesday in May. Colorado notices arrive in May with a June 1 deadline. Iowa's Board of Review window closes May 5. Indiana payment is due May 10. If you received a notice in the last few weeks, your deadline may be days away. Do not wait.
States With May Assessment Activity
| State | What Happens | Key Date |
|---|---|---|
| Texas | Protest deadline | May 15 or 30 days after notice |
| New York | Grievance Day hearings | Third Tuesday in May (varies by municipality) |
| Colorado | Assessment notices arrive | Notices mailed in May; appeal by June 1 |
| Iowa | Board of Review closes | April 25 - May 5 |
| Wisconsin | Board of Review meets | Varies by municipality (typically May) |
| Indiana | Tax payment due | May 10 |
| Minnesota | Board of Appeal preparations | June meetings, prepare in May |
May Appeal Deadlines
Texas - May 15
Texas is the biggest property tax appeal market in the country. Nearly 2 million homeowners protest their appraisals each year, and roughly half get a reduction. The deadline is May 15 or 30 days after the Notice of Appraised Value was sent, whichever is later.
If you have not filed your protest yet, do it today. You can file online through your county appraisal district website. The filing itself is simple. A one-page form with your name, address, and reason for protesting (check "Value is over market value" in most cases).
After filing, you will be scheduled for an informal hearing. Bring comparable sales and your notice details. Full Texas guide.
New York - Grievance Day (Third Tuesday in May)
New York's Grievance Day is when the Board of Assessment Review hears complaints about assessed values. The date is typically the third Tuesday in May, but it varies by municipality. Check with your local assessor's office for the exact date.
File Form RP-524 (Complaint on Real Property Assessment) before or on Grievance Day. Bring comparable sales and any evidence of overassessment. The board reviews your case and issues a decision, usually within a few weeks. Full New York guide.
Iowa - Board of Review Closes May 5
Iowa's Board of Review session runs from approximately April 25 to May 5. This is a compressed window. If you have not filed your protest yet, you are running out of time.
Wisconsin - Board of Review (Varies)
Wisconsin's Board of Review meets at different times in different municipalities, but many schedule sessions in May. Contact your municipal clerk for the exact date. You must file a written objection before the Board of Review meets and attend the hearing (or submit in writing if the board allows it).
May Payment Deadlines
| State | What Is Due | Date | Notes |
|---|---|---|---|
| Indiana | Spring installment | May 10 | Fall installment due November 10 |
| Kansas | Second half | May 10 | First half was due December 20 |
| Minnesota | First half | May 15 | Second half due October 15 |
| New Jersey | Second quarter | May 1 | Grace period to May 10 |
| Wyoming | Second installment | May 10 | First was due November 10 |
What to Do in May
If Your Texas Protest Is Due
- File today. You can file online in 5 minutes at your county appraisal district's website.
- Gather comps. Find 3-5 recent sales of similar homes near you that sold for less than your appraised value.
- Prepare for the informal hearing. Most Texas appraisal districts schedule informal hearings 2-6 weeks after filing. This is where most protests are resolved.
- Do not accept "we'll get back to you." Get a specific hearing date and time.
If You Are in New York
- Find your Grievance Day. Contact your assessor or check the municipal website.
- Complete Form RP-524. List your property, the current assessed value, and your opinion of value.
- Bring evidence. Comparable sales, photos of condition issues, and assessment comparisons with similar homes.
If Colorado Notices Are Arriving
Colorado sends assessment notices in May with a June 1 appeal deadline. That gives you roughly 2-3 weeks. Colorado is a reassessment state (every odd-numbered year for residential, starting in 2025), so 2026 values reflect the prior year's reassessment adjustments.
If your value jumped, check comparable sales from the 18-month period used for the reassessment. Colorado uses a specific "data collection period" to determine values, so make sure your comps fall within that window.
The May Crunch for Texas Homeowners
Texas deserves special attention because the volume of protests is enormous. Harris County (Houston) alone processes over 500,000 protests some years. That means:
- File early to get an earlier hearing date
- Come prepared with organized evidence
- The informal hearing is your best shot at a resolution. Take it seriously.
- If the informal hearing does not work, you will be scheduled for a formal ARB hearing
Texas homeowners who protest with comparable sales data win about 60-70% of the time. Homeowners who show up without evidence win at much lower rates.
Preparing for June Deadlines
Several states have June deadlines coming up. If you are in Colorado, Indiana, Tennessee, Idaho, Montana, or Nebraska, use May to prepare:
- Pull your assessment notice and property record card
- Research comparable sales
- Document condition issues
- Complete the appeal form
Being ready to file the day after the notice arrives gives you the maximum time for preparation and avoids the last-minute rush.
Frequently Asked Questions
What should I know about may property tax deadlines by state: what's due this month?
May is the single biggest month for property tax appeal deadlines. Texas protests are due May 15 (or 30 days after notice). New York's Grievance Day falls on the third Tuesday in May.
What should I know about may appeal deadlines?
Texas is the biggest property tax appeal market in the country. Nearly 2 million homeowners protest their appraisals each year, and roughly half get a reduction. The deadline is May 15 or 30 days after the Notice of Appraised Value was sent, whichever is later.
What to Do in May?
Colorado sends assessment notices in May with a June 1 appeal deadline. That gives you roughly 2-3 weeks. Colorado is a reassessment state (every odd-numbered year for residential, starting in 2025), so 2026 values reflect the prior year's reassessment adjustments.
What should I know about the may crunch for texas homeowners?
Texas deserves special attention because the volume of protests is enormous. Harris County (Houston) alone processes over 500,000 protests some years. That means:
What should I know about preparing for june deadlines?
Several states have June deadlines coming up. If you are in Colorado, Indiana, Tennessee, Idaho, Montana, or Nebraska, use May to prepare:
What should I know about may deadlines are closing fast?
Texas (May 15), New York (Grievance Day), Iowa (May 5) - the biggest appeal deadlines of the year are this month. PropertyTaxFight builds your evidence packet in minutes. $79.
May Deadlines Are Closing Fast
Texas (May 15), New York (Grievance Day), Iowa (May 5) - the biggest appeal deadlines of the year are this month. PropertyTaxFight builds your evidence packet in minutes. $79. No subscription. File your appeal with confidence.