(a) The total of the rate adjustments for any six-month period may not exceed one-half of one percent a year.
(b) If the stated interval for rate adjustments is a 12-month period or longer, a rate adjustment may not exceed one percent a year.
(c) The total of all rate adjustments over the term of the credit transaction may not exceed the least of:
(1) one-half of the initial rate;
(2) eight percent; or
(3) a rate, expressed as a percentage, computed by dividing the term of the loan in years by two.
Official text of the Texas Finance Code as published by the Texas Legislative Council.