Texas constitution
Article 8: taxation and revenue
Section 13

(e) The former owner of real property not covered by Subsection (c) of this section sold for unpaid taxes shall within six months from the date of filing for record of the Purchaser's Deed have the right to redeem the property upon the payment of the amount of money paid for the property, including the Tax Deed Recording Fee and all taxes, penalties, interest, and costs paid plus an amount not exceeding 25 percent of the aggregate total.