Letter of Authority for Tax Audit

What is a Letter of Authority?

A Letter of Authority (LOA) is an official document issued by the Bureau of Internal Revenue (BIR) that grants its revenue officers the legal authority to conduct tax examinations, investigations, and audits of a taxpayer's books of accounts, records, financial statements, and other documents. The LOA is the formal authorization required under the National Internal Revenue Code (NIRC §7, as amended by RA 10963 TRAIN Law) for any BIR officer to access and review a taxpayer's tax records.

Legal Basis and Requirements

The issuance of an LOA is mandated by NIRC §7 (Powers and Duties of the Commissioner), which grants the BIR Commissioner authority to examine any books, records, accounts, and other documents relevant to tax liability. Revenue Memorandum Order (RMO) 20-2018 and subsequent BIR circulars establish the procedural requirements for LOA issuance, including the specific information that must be included in the document.

An LOA must contain: (1) the name and TIN of the taxpayer being audited; (2) the period covered by the examination; (3) the specific taxes or tax years under review; (4) the name and designation of the assigned revenue officer(s); (5) the authority granted (examination, investigation, or both); and (6) the signature of the authorized BIR official issuing the LOA.

Types of LOA Issuance

The BIR issues LOAs for different audit purposes: (1) Regular Audit — routine examination of tax returns and supporting documents; (2) Special Audit — focused investigation into specific transactions or issues; (3) Lifestyle Audit — examination of a taxpayer's assets and expenditures relative to reported income; and (4) Jeopardy Assessment — urgent audit when the BIR believes a taxpayer may dissipate assets or leave the country (NIRC §228).

Taxpayer Rights Upon Receipt of LOA

When a taxpayer receives an LOA, they have the right to: (1) request a copy of the LOA and verify its authenticity with the issuing RDO; (2) designate a representative (CPA, lawyer, or authorized agent) to accompany the examination; (3) request a reasonable extension of the examination period if additional time is needed to gather documents; (4) request a conference with the revenue officer to discuss preliminary findings; and (5) file a protest or appeal if they disagree with the assessment (NIRC §228, RMO 20-2018).

Examination Process Under LOA

Once an LOA is issued, the revenue officer may: (1) request the taxpayer to produce books, records, and documents; (2) conduct interviews with the taxpayer or their representatives; (3) examine bank statements, invoices, receipts, and other supporting documents; (4) verify transactions with third parties (suppliers, customers, banks); and (5) prepare an audit report with findings and proposed adjustments. The examination period typically does not exceed 12 months from the date of the LOA, unless extended by the BIR (NIRC §7).

Assessment and Notice of Deficiency

Upon completion of the examination, if the BIR finds tax deficiencies, it must issue a Preliminary Assessment Notice (PAN) or Formal Letter of Demand (FLD) informing the taxpayer of the proposed adjustments. The taxpayer then has 30 days to respond with a protest or request a conference. If no agreement is reached, the BIR issues a Notice of Deficiency Tax (NODT), which is the formal assessment that can be appealed to the Court of Tax Appeals (CTA) within 30 days (NIRC §228).

Validity and Expiration

An LOA is valid for the period specified in the document, typically one to three years depending on the scope of the audit. The BIR may extend the LOA if additional time is needed to complete the examination. However, the statute of limitations for assessment is generally three years from the date of filing of the return, or ten years if the taxpayer failed to file a return (NIRC §203).