(a) An insurer subject to this subchapter may not use a rate until the rate has been filed with the department and approved by the commissioner in accordance with this subchapter.
(b) Notwithstanding Subsection (a), after a rate filing is approved under this subchapter, an insurer, without prior approval of the commissioner, may use any rate subsequently filed by the insurer if the subsequently filed rate does not exceed the lesser of:
(1) 107.5 percent of the rate approved by the commissioner; or
(2) 110 percent of any rate used by the insurer in the previous 12-month period.

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