Section 112National Internal Revenue Code of 1997 (Republic Act No. 8424), Sec. 112

Refunds or Tax Credits of Input Tax. -

(A) Zero-rated or Effectively Zero-rated Sales. - any VAT-registered person, whose sales are zero-rated or effectively zero-rated may, within two (2) years after the close of the taxable quarter when the sales were made, apply for the issuance of a tax credit certificate or refund of creditable input tax due or paid attributable to such sales, except transitional input tax, to the extent that such input tax has not been applied against output tax: Provided, however, That in the case of zero-rated sales under Section 106(A)(2)(a)(1), (2) and (B) and Section 108 (B)(1) and (2), the acceptable foreign currency exchange proceeds thereof had been duly accounted for in accordance with the rules and regulations of the Bangko Sentral ng Pilipinas (BSP): Provided, further, That where the taxpayer is engaged in zero-rated or effectively zero-rated sale and also in taxable or exempt sale of goods of properties or services, and the amount of creditable input tax due or paid cannot be directly and entirely attributed to any one of the transactions, it shall be allocated proportionately on the basis of the volume of sales.

(B) Capital Goods. - A VAT-registered person may apply for the issuance of a tax credit certificate or refund of input taxes paid on capital goods imported or locally purchased, to the extent that such input taxes have not been applied against output taxes. The application may be made only within two (2) years after the close of the taxable quarter when the importation or purchase was made.

(C) Cancellation of VAT Registration. - A person whose registration has been cancelled due to retirement from or cessation of business, or due to changes in or cessation of status under Section 106(C) of this Code may, within two (2) years from the date of cancellation, apply for the issuance of a tax credit certificate for any unused input tax which may be used in payment of his other internal revenue taxes.

(D) Period within which Refund or Tax Credit of Input Taxes shall be Made. - In proper cases, the Commissioner shall grant a refund or issue the tax credit certificate for creditable input taxes within one hundred twenty (120) days from the date of submission of compete documents in support of the application filed in accordance with Subsections (A) and (B) hereof.

In case of full or partial denial of the claim for tax refund or tax credit, or the failure on the part of the Commissioner to act on the application within the period prescribed above, the taxpayer affected may, within thirty (30) days from the receipt of the decision denying the claim or after the expiration of the one hundred twenty day-period, appeal the decision or the unacted claim with the Court of Tax Appeals.-

(E) Manner of Giving Refund. - Refunds shall be made upon warrants drawn by the Commissioner or by his duly authorized representative without the necessity of being countersigned by the Chairman, Commission on audit, the provisions of the Administrative Code of 1987 to the contrary notwithstanding: Provided, That refunds under this paragraph shall be subject to post audit by the Commission on Audit.

CHAPTER II - COMPLIANCE REQUIREMENTS