Input VAT Substantiation: BIR Requirements for Claiming Input Tax Credits

Claiming input VAT credit against a business’s output VAT liability under NIRC Section 110 requires more than proof a purchase happened — it requires a properly completed BIR-registered VAT invoice. Since the Ease of Paying Taxes Act (RA No. 11976), a single invoice format now substantiates input VAT for both goods and services, and any missing required field on that invoice makes the input VAT non-creditable, even when the underlying transaction was entirely legitimate.

What changed about which document substantiates input VAT? #

Before the EOPT Act, invoices supported input VAT on purchases of goods while a separate Official Receipt supported input VAT on purchases of services — two different documents for two different transaction types. Revenue Regulations No. 7-2024, as amended by RR No. 11-2024, eliminated that split: a BIR-registered VAT invoice is now the uniform substantiation document for input VAT on both goods and services purchases. A business still holding onto the old two-document convention needs to update its accounts-payable intake to expect and require invoices from every VAT-registered supplier, not receipts for service purchases.

What must the invoice show to substantiate a valid claim? #

Substantiation is a facial requirement — the BIR looks at what the invoice itself displays, not what the parties intended. A creditable invoice must show:

• The seller’s and buyer’s registered name and TIN
• The date of the transaction
• A description of the goods or services provided
• Quantity and unit cost, where applicable
• The VAT rate and VAT amount shown separately (or a clear notation that the sale is VAT-exempt or zero-rated)
• The total amount of the transaction

Every one of these fields is a substantiation requirement, not a formality — an invoice missing any of them puts the associated input VAT claim at risk on audit or in a refund proceeding, related to the invoicing rules covered in Invoice vs. Official Receipt: What Changed Under the EOPT Act.

Why does a missing field defeat a legitimate claim? #

Input VAT unsupported by a properly completed invoice is not creditable, regardless of whether the purchase genuinely occurred and was properly paid for. This is the substantiation principle underlying Input VAT vs. Output VAT: the BIR does not verify the reality of every transaction on audit — it verifies whether the paper trail meets the invoicing requirements. A real, fully paid purchase with an invoice missing the buyer’s TIN produces the same result on audit as a purchase that never happened: the input VAT is disallowed until the defect is corrected or supplemented.

A worked example #

A VAT-registered manufacturing company receives a ₱560,000 invoice (₱500,000 plus ₱60,000 VAT) from a raw materials supplier for its Q2 filing. On review before submitting its BIR Form 2550Q, the accounting team notices the invoice shows the seller’s TIN and the transaction description correctly, but the buyer’s (its own) TIN field was left blank by the supplier’s billing system. Until the supplier reissues a corrected invoice with the buyer’s TIN properly indicated, the ₱60,000 input VAT on that purchase is not creditable — not because the purchase is in question, but because the invoice as issued fails the facial substantiation test.

Summary #

Since the EOPT Act, one VAT invoice format substantiates input VAT for both goods and services, and every required field on that invoice — registered names, TINs, date, description, and VAT amount — determines whether the claim survives audit, independent of whether the transaction actually occurred. Pair this with Input VAT vs. Output VAT for the underlying credit mechanism and Invoice vs. Official Receipt for the broader EOPT invoicing shift.