Can the BIR assess me even if I filed my return correctly?

Yes. The BIR may issue an assessment if it finds discrepancies, mismatches, or documentation gaps. Even if the figures were correct, the BIR may ask for proof. Action: Gather your books, receipts, and bank statements and prepare a reconciliation schedule.

What if I never received the PAN or FAN?

If notices were not properly served, the assessment may be void due to lack of due process. Proper service includes personal service, registered mail, or other legally recognized modes. Action: Check the envelope, registry receipts, or records showing how and when notices were delivered.

Can I still challenge an assessment after 30 days?

Once the 30-day protest period lapses, the assessment becomes final and cannot be appealed administratively. Some taxpayers pursue judicial remedies, but these are complex and rarely succeed if deadlines were missed. Action: Immediately verify the receipt date of your FAN and count 30 days forward.

What if the BIR disallowed my expenses?

You may challenge disallowances by proving the expenses were ordinary, necessary, and substantiated. Supporting evidence such as contracts, invoices, delivery receipts, or bank records can help. Action: Organize supporting documents by expense category and prepare a narrative explaining business purpose.

How do I know if the assessment is time-barred?

Most assessments must be issued within three years from filing the return. Longer periods apply only in cases of fraud or false returns with intent to evade tax. Action: Check the filing date of your return and the date the LOA or PAN was issued.

How do I avoid future income tax assessments?

Regular reconciliation of books, filing accurate and complete returns, and maintaining complete documentary support significantly reduce exposure. Action: Perform quarterly internal audits to identify mismatches early.

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Income Tax Assessments in the Philippines: What They Mean, Why They Happen, and How to Respond Properly

Atty. Francesco Britanico

March 19, 2026

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Table of Contents

What Is an Income Tax Assessment?

What Is the Legal Basis for Income Tax Assessments?

What Happens If You Ignore an Income Tax Assessment?

How Does the Income Tax Assessment Process Work?

What Evidence Is Needed to Respond to an Income Tax Assessment?

What Do Major Court Cases Teach Us About Income Tax Assessments?

Income Tax Assessments in the Philippines: What They Mean, Why They Happen, and How to Respond Properly - Lawyers in the Philippines

Income Tax Assessments in the Philippines: What They Mean, Why They Happen, and How to Respond Properly