Tex. Tax Code § 11.436

(a) An organization that acquires property that qualifies for an exemption under Section 11.181(a) or 11.1825 may apply for the exemption for the year of acquisition not later than the 30th day after the date the organization acquires the property, and the deadline provided by Section 11.43(d) does not apply to the application for that year.

(b) If the application is granted, the exemption for that year applies only to the portion of the year in which the property qualifies for the exemption, as provided by Section 26.111. If the application is granted after approval of the appraisal records by the appraisal review board, the chief appraiser shall notify the collector for each taxing unit in which the property is located. The collector shall calculate the amount of tax due on the property in that year as provided by Section 26.111 and shall refund any amount paid in excess of that amount.

(c) To facilitate the financing associated with the acquisition of a property, an organization, before acquiring the property, may request from the chief appraiser of the appraisal district established for the county in which the property is located a preliminary determination of whether the property would qualify for an exemption under Section 11.1825 if acquired by the organization. The request must include the information that would be included in an application for an exemption for the property under Section 11.1825. Not later than the 45th day after the date a request is submitted under this subsection, the chief appraiser shall issue a written preliminary determination for the property included in the request. A preliminary determination does not affect the granting of an exemption under Section 11.1825.