Tex. Loc. Gov't Code § 111.0107

The county auditor or the county judge in a county that does not have a county auditor shall certify to the commissioners court the receipt of all revenue from intergovernmental contracts that is available for disbursement in a fiscal year but not included in the budget for that fiscal year. On certification, the court shall adopt a special budget for the limited purpose of spending the revenue from intergovernmental contracts for its intended purpose.