Unless your mortgage company pays these for you out of your escrow account, our County Property tax and Municipal Utility District taxes are due by the 31st of January each year.
You can pay the Harris County Property tax at:
They offer phone, postal mail, and credit card online payments.
If you were hoping to pay online, you'll probably want to submit an "e-check" since for credit cards, they charge an extra 2.15% "convenience" fee and for VISA debit cards, they charge a flat $3.95. Mailing a check will also save you fees, but cost a stamp. The e-checks are free but are redirected/handled by Cadence Bank via harris.egovpayments.com. Google Chrome warns that site is insecure for not using HTTPS so I mailed mine.
If you have been around long enough to remember them being separate, the City of Katy tax is now included in the County bill.
You can pay the MUD tax for our Harris-Waller County MUD #2 at:
This one is handled by Certified Payments (.net) and they charge 3% on all credit cards. It's only 50 cents to submit an e-check, making it comparable to the cost of a stamp. They do HTTPS correctly, but I mailed mine anyway.