BIR Audit & Tax Assessment Defense

A BIR audit may begin through the BIR's current electronic audit-authority process and can involve examination of records for identified taxable periods. The applicable audit controls, authorized personnel, document requests, and procedural safeguards must be assessed against the current BIR framework and the records issued for the specific matter. RMO No. 1-2026, together with later 2026 issuances, introduced a revised audit framework and a Single-Instance Audit Framework.

The audit process can move through several stages, each with its own procedural requirements and statutory deadlines. The correct response depends on the document received, the date and manner of receipt, the taxpayer's records, and the current applicable issuance. Missing an applicable statutory protest or appeal deadline can have serious consequences, including finality of an assessment and the commencement of collection remedies.

The most common deficiency findings in BIR audits involve undeclared income, disallowed expenses, VAT discrepancies between the Summary List of Sales/Purchases and the VAT returns, withholding tax deficiencies, and documentary stamp tax issues. Many of these findings arise not from intentional non-compliance but from technical documentation gaps, missing official receipts, invoices without the required information, or input VAT claims that cannot be substantiated.