Tex. Code of Criminal Procedure § 45A.253

(a) In imposing a fine and costs, the justice or judge shall allow the defendant to pay the fine and costs in specified portions at designated intervals if the justice or judge determines that the defendant is unable to immediately pay the fine and costs.

(b) If a diversion is not required under Subchapter K, a judge shall allow a defendant who is a child, as defined by Article 45A.453(a), to elect at the time of conviction, as defined by Section 133.101, Local Government Code, to discharge the fine and costs by:

(1) performing community service or receiving tutoring under Article 45A.460, regardless of whether the applicable offense occurred at a location specified by Subsection (a) of that article; or

(2) paying the fine and costs in a manner described by Article 45A.251(b).

(c) The defendant must make the election under Subsection (b) in writing. The defendant and, if present, the defendant's parent, guardian, or managing conservator must sign the election. The court shall maintain the written election as a record of the court and provide a copy to the defendant.

(d) Notwithstanding Article 45A.252 or any other provision of this chapter, in imposing a fine and costs, the justice or judge may not require a defendant who is under the conservatorship of the Department of Family and Protective Services or in extended foster care as provided by Subchapter G, Chapter 263, Family Code, to pay any amount of the fine and costs. In lieu of the payment of fine and costs, the justice or judge may require the defendant to perform community service as provided by Article 45A.254, 45A.459, or 45A.460, as appropriate.