Texas Tax Code - TAX § 31.12. Payment of Certain Tax Refunds;  Interest

(1) if the refund is required by Section 11.35(j), on the date the collector for the taxing unit learns the refund is required;

(2) if the refund is required by Section 11.431(b), 11.436(b), 11.438(c), or 11.439(b), on the date the chief appraiser notifies the collector for the taxing unit of the approval of the applicable exemption;

(3) if the refund is required by Section 23.1243(d), on the date the chief appraiser notifies the collector for the taxing unit of the amount of tax to be refunded;

(4) if the refund is required by Section 23.48(d), 23.60(d), 26.1115(c), 26.112(b), 26.1125(b), or 26.1127(b), on the date the assessor notifies the collector for the taxing unit of the decrease in the person's tax liability;

(5) if the refund is required by Section 26.05(e), on the date the action to enjoin the collection of taxes imposed by the taxing unit is finally determined;

(6) if the refund is required by Section 26.07(g),26.075(k), or 26.08(d-2), on the date the assessor for the taxing unit mails the corrected tax bills under Section 26.07(f), 26.075(j), or 26.08(d-1), as applicable;

(7) if the refund is required by Section 26.15(f):

(8) if the refund is required by Section 31.061(e), on the date the taxing unit determines that the amount credited under Section 31.061(d) exceeds the amount due to the taxing unit;

(9) if the refund is required by Section 31.071(c), on the date the challenge, protest, or appeal is finally determined;

(10) if the refund is required by Section 31.11, on the date the auditor for the taxing unit determines that the payment was erroneous or excessive ;

(11) if the refund is required by Section 31.111, on the date the collector for the taxing unit determines that the payment was erroneous;  or

(12) if the refund is required by Section 31.112(c)(3), on the date the agreement described by Section 31.112(c) is made.