Texas Property Tax Penalty & Interest Guide (How to Calculate Your Fees)

Texas is known for having some of the highest property taxes in the country, but what catches many property owners off guard is how aggressive the state is when those taxes are paid late. If you miss the payment of property taxes deadline, the financial consequences snowball rapidly.

If you are looking for a tax penalty calculator to figure out exactly how much you owe in late fees, this guide will break down the exact formula the state uses. (Looking to calculate your base property tax bill instead — not a late penalty? Use our Texas property tax calculator.)

When Do Texas Property Taxes Become Delinquent?

For most property owners, tax bills are mailed out in October and are due by January 31st of the following year. If the bill is not paid in full by January 31st, the taxes officially become delinquent on February 1st.

How to Calculate Your Property Tax Penalty (The Formula)

Texas imposes both a flat penalty and a recurring interest charge for late payments. The penalty starts at 6% in February and increases by 1% each month. The interest starts at 1% in February and also increases by 1% each month.

Here is how you can calculate your exact late fees (based on your base tax bill) if you pay late:

• February: 6% penalty + 1% interest = 7% total added
• March: 7% penalty + 2% interest = 9% total added
• April: 8% penalty + 3% interest = 11% total added
• May: 9% penalty + 4% interest = 13% total added
• June: 10% penalty + 5% interest = 15% total added
• July: 12% penalty + 6% interest = 18% total added

Can Property Tax Penalties Be Waived in Texas?

Texas law is incredibly strict regarding penalty waivers. Under Texas Tax Code Section 33.011, a waiver may only be granted in highly specific situations. Crucially, excuses like "I forgot," "I never received the bill," or "I didn't have the funds" are not legally valid reasons to waive a penalty. Acceptable reasons include:

• An error or omission made by the appraisal district or tax office.
• Documented delivery errors by the United States Postal Service.

How to Avoid Penalties Next Year (Protest Your Value)

Because property tax rates by city in Texas are so high, these penalties can quickly amount to thousands of dollars. If you are struggling to pay your property taxes, the absolute best form of property tax relief in Texas is to ensure your property is not over-valued in the first place.

By protesting your property value every single year, you can lower the base assessment, which permanently lowers the tax bill you have to pay. Not sure how that base bill is calculated in the first place? Review our guide to how Texas property taxes are calculated, or use our property tax calculator to estimate your protest savings.