(a) A money judgment of a court of this state to which Section 304.002 does not apply, including court costs awarded in the judgment and prejudgment interest, if any, earns postjudgment interest at the rate determined under this section.
(b) On the 15th day of each month, the consumer credit commissioner shall determine the postjudgment interest rate to be applied to a money judgment rendered during the succeeding calendar month.
(c) The postjudgment interest rate is:
(1) the prime rate as published by the Board of Governors of the Federal Reserve System on the date of computation;
(2) five percent a year if the prime rate as published by the Board of Governors of the Federal Reserve System described by Subdivision (1) is less than five percent; or
(3) 15 percent a year if the prime rate as published by the Board of Governors of the Federal Reserve System described by Subdivision (1) is more than 15 percent.