this clause shall be rounded to the nearest multiple of $1,000,000. (4) Rules related to payments and reports (A) Timing of payments The Secretary shall make payments under paragraph (1) for any calendar year— (i) after receipt of the report described in subparagraph (B) for such calendar year, and (ii) except as provided in clause (i), within a reasonable period of time before the due date for individual income tax returns (as determined under the laws of Puerto Rico) for taxable years which began on the first day of such calendar year. (B) Annual reports With respect to calendar year 2021 and each calendar year thereafter, Puerto Rico shall provide to the Secretary a report which shall include— (i) an estimate of the costs described in paragraphs (1)(B)(i) and (3)(A)(i)(I) with respect to such calendar year, and (ii) a statement of such costs with respect to the preceding calendar year. (C) Adjustments (i) In general In the event that any estimate of an amount is more or less than the actual amount as later determined and any payment under paragraph (1) was determined on the basis of such estimate, proper payment shall be made by, or to, the Secretary (as the case may be) as soon as practicable after the determination that such estimate was inaccurate. Proper adjustment shall be made in the amount of any subsequent payments made under paragraph (1) to the extent that proper payment is not made under the preceding sentence before such subsequent payments. (ii) Additional reports The Secretary may require such additional periodic reports of the information described in subparagraph (B) as the Secretary determines appropriate to facilitate timely adjustments under clause (i). (D) Determination of cost of earned income tax credit For purposes of this subsection, the cost to Puerto Rico of the earned income tax credit shall be determined by the Secretary on the basis of the laws of Puerto Rico and shall include reductions in revenues received by Puerto Rico by reason of such credit and refunds attributable to such