Tax Code §33.08

(a) This section applies to a taxing unit or appraisal district only if: (1) the governing body of the taxing unit or appraisal district has imposed the additional penalty for collection costs under Section 33.07 ; and (2) the taxing unit or appraisal district, or another taxing unit that collects taxes for the unit, has entered into a contract with an attorney under Section 6.30 for the collection of the unit's delinquent taxes. (b) The governing body of the taxing unit or appraisal district, in the manner required by law for official action, may provide that taxes that become delinquent on or after June 1 under Section 26.075 (j), 26.15 (e), 31.03 , 31.031 , 31.032 , 31.033 , 31.04 , or 42.42 incur an additional penalty to defray costs of collection. The amount of the penalty may not exceed the amount of the compensation specified in the applicable contract with an attorney under Section 6.30 to be paid in connection with the collection of the delinquent taxes. (c) After the taxes become delinquent, the collector for a taxing unit or appraisal district that has provided for the additional penalty under this section shall send a notice of the delinquency and the penalty to the property owner. The penalty is incurred on the first day of the first month that begins at least 21 days after the date the notice is sent. (d) A tax lien attaches to the property on which the tax is imposed to secure payment of the additional penalty. (e) A taxing unit or appraisal district that imposes the additional penalty under this section may not recover attorney's fees in a suit to collect delinquent taxes subject to the penalty.