On September 1, 1999, the Texas Comptroller of Public Accounts implemented new payment requirements centered on the 30-day period for payment. The law states that payments must be made to vendors within 30 days from the latter of:

When a state agency’s payment is defined as overdue on the 31st day, an automatic payment of interest is assessed to the vendor. The Comptroller must automatically calculate any interest that an agency owes a vendor for late payment of goods received and/or services performed and must include that interest payment with the principal payment to the vendor.