Tex. Tax Code § 202.201

(a) A producer authorized by the comptroller to remit the tax due shall file with the comptroller, on or before the 25th day of each calendar month, the report under this subsection and, as applicable, the report under Subsection (d) showing the total oil produced, used, lost or stolen, or possessed and otherwise unaccounted for by the producer during the preceding calendar month. The report under this subsection must show:

(1) the number of barrels of oil produced from each lease;

(2) each county in which each lease from which oil was produced is located;

(3) the name, address, and taxpayer identification number assigned by the comptroller of each first purchaser of oil and for each the amount of oil purchased from each lease;

(4) the payment received for the oil from each first purchaser from each lease from which oil was produced;

(5) the name and lease identification number of each lease from which the oil was produced; and

(6) other information the comptroller may reasonably require.

(b) If the report the producer is required to file shows additional tax due, the producer must pay the additional tax when he files the report.

(c) A producer whose only sales are to a purchaser who remits the tax due under Section 202.153 is not required to file a report on the oil sold.

(d) A producer shall file a crude oil special tax report with the comptroller and pay the applicable tax imposed under this chapter if any oil has been used, lost or stolen, or possessed and otherwise unaccounted for by the producer after it has been produced and measured. The producer must file the report on or before the 25th day of the month following the month in which the oil is used, lost or stolen, or possessed and otherwise unaccounted for. The report must show:

(1) the total number of barrels of oil used, lost or stolen, or possessed and otherwise unaccounted for by the producer;

(2) where the oil was used, lost or stolen, or possessed and otherwise unaccounted for; and

(3) other information the comptroller may reasonably require.

(e) A producer that is no longer in business shall notify the comptroller of this fact on or before the 25th day of the first month following the producer's last day of business.