31 C.F.R. § 50.73
(b) Initial certification of loss. An insurer shall use its best efforts to file with the Program the Initial Certification of Loss within 45 days following the last calendar day of the month when an insurer has paid aggregate insured losses that exceed its insurer deductible. The Initial Certification of Loss will include the following:
(1) Basic information, on a form prescribed by Treasury, about each insured loss paid (or to be paid pursuant to § 50.73(b)(2)(i)) by the insurer. The form will include:
(2) A certification that the insurer is in compliance with the provisions of section 103(b) of the Act and this part, including certifications that:
(c) Supplementary certifications of loss. If the total amount of the Federal share of compensation due an insurer for insured losses under the Act has not been determined at the time an Initial Certification of Loss has been filed, the insurer shall file monthly, or on a schedule otherwise determined by Treasury, Supplementary Certifications of Loss updating the amount of the Federal share of compensation due for the insurer's insured losses. Supplementary Certifications of Loss will include the following: