In the Philippines, the Bureau of Internal Revenue (BIR) is the primary government agency responsible for enforcing tax laws and collecting taxes. Its mandate includes the assessment and collection of the national internal revenue taxes and enforcement of penalties for tax evasion and noncompliance. 

As part of its enforcement efforts, the BIR issues various types of letters and notices to taxpayers, each serving a specific purpose. So, whether you’re running a large corporation or earning as an independent contractor, understanding these BIR letters is key to staying tax-compliant.

9 Common BIR Letters and Notices

BIR letters and notices generally refer to office correspondence from the BIR that serve various purposes, primarily related to taxpayer compliance, audits, assessments, and enforcement of tax laws. 

There are nine (9) types of letters and notices that the bureau may issue: mission orders, benchmarking notices, letters of authority, subpoenas duces tecum, notices of discrepancy, preliminary assessment notices, final assessment notices and formal letters of demand, final decisions of disputed assessments, and the warrants of distraint and/or levy. 

1. Mission Orders (MOs)

A Mission Order (MO) is an official directive issued by the Bureau of Internal Revenue (BIR) and signed by the regional director that authorizes certain BIR personnel to carry out specific surveillance, stock-taking, tax law enforcement, and other non-audit investigative activities. These include activities like, Tax Mapping, Oplan Kandado,  verification of receipts, and general compliance checks.

With this official order, the BIR can inspect your business for tax compliance, verify sales transactions, ensure that you are following bookkeeping rules, and check the proper use of cash registers and point-of-sale machines. 

2. Benchmarking Notices (BNs)

A Benchmarking Notice (BN) is generally issued to taxpayers whose tax compliance falls below industry standards. Based on how much your tax filings deviate from the established benchmarks, you are categorized as high, medium, or low risk. This notice is a prompt for you to review and amend your VAT and income tax returns if discrepancies are found.

Though it is not a valid tax assessment and cannot enforce collections, you will be given 15 days by the BIR to respond or correct any issues. Your failure to respond may lead to further BIR actions, such as surveillance, inventory stocktaking, or a tax audit to verify compliance and business performance.

3. Letter of Authority (LOA)

A Letter of Authority (LOA) marks the beginning of the BIR audit process. Previously, it had to be served within 30 days from issuance, or it would become invalid. Under the updated RAMO No. 1-2020, however, this requirement has been removed. Now, a LOA is usually served electronically (eLA), and the audit must be completed within 180 days for regular RDO cases and 240 days for large taxpayers. If the eLA is not served within 30 days, it remains valid as long as the audit is finished within the prescribed time frame. 

A LOA specifies the tax types to be examined, the taxable years, and the dates covered in the audit. As the concerned taxpayer, it is important for you to be aware of the LOA’s issuance date, as the BIR can assess taxes within three years from the filing deadline of the relevant tax return. 

4. Subpoena Duces Tecum (SDT)

After the issuance and service of the Letter of Authority (LOA), you are required to present your accounting records and other relevant documents to the assigned Revenue Officer to facilitate the audit. If you fail to do so, the BIR will issue a series of notices— First, Second, and Final Notices—urging you to comply. 

Your continued non-compliance may result in the issuance of a Subpoena Duces Tecum (SDT), which serves as a formal order that compels you to produce the required documents, specifying exactly what needs to be submitted. If you still fail to comply despite the SDT, the case may be escalated to the Prosecution Division at the National Office or the Legal Division at the Regional Office, depending on the nature of the case. This escalation can lead to legal actions against you for non-compliance.

5. Notice of Discrepancy (NOD)

A Notice of Discrepancy (NOD) is issued by the BIR during audits or investigations to address any discrepancies found in your tax filings. This NOD includes important details such as your information, the taxable period under review, the relevant Letter of Authority (LOA), and a reference to the discrepancies. 

Your received NOD is just a preliminary notice and does not constitute a deficiency tax assessment. Once you receive this, you are given the opportunity to explain these discrepancies within 5 days. Additionally, if you fail to reconcile the discrepancies or provide supporting documents, a Preliminary Assessment Notice (PAN) may then be issued. 

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6. Preliminary Assessment Notice (PAN)

If the issue remains unresolved after the issuance of the Notice of Discrepancy (NOD), the BIR will issue you a Preliminary Assessment Notice (PAN). Upon receiving the PAN, you have 15 days to respond in writing, providing arguments, explanations, and any evidence that supports your position. 

Your response to the PAN can include additional documents to back up your tax claims and to address any disagreements based on their specific situation and applicable laws, rules, and regulations.

7. Final Assessment Notice (FAN) and Formal Letter of Demand (FLD)

If you fail to respond to the Preliminary Assessment Notice (PAN) within 15 days, the BIR will issue you a Final Assessment Notice (FAN) and Formal Letter of Demand (FLD). These documents demand payment for any deficiency tax liabilities and must include the relevant facts, laws, rules, or jurisprudence that support the tax assessment. 

If you disagree with the assessment, you can file an administrative protest within 30 days of receiving the FLD/FAN. Your protest can either be a Request for Reconsideration (re-evaluation based on existing records) or a Request for Reinvestigation (re-evaluation based on new evidence). If such a protest is not filed within 30 days, or if certain issues are not disputed, the assessment becomes final and demandable, and you will be required to pay the deficiency tax.

8. Final Decision on Disputed Assessment (FDDA)

The Final Decision on Disputed Assessment (FDDA) is issued by the BIR’s Assistant Commissioner, Regional Director, or an authorized higher revenue official in response to your protest. It contains the facts, applicable laws, rules, and regulations supporting the decision and clarifies that it is the final decision. However, a void FDDA (due to missing facts or legal basis) does not invalidate the assessment itself. The assessment remains enforceable even if the decision lacks proper documentation.

If you disagree with the FDDA, you can still request reconsideration from the Office of the Commissioner (CIR) or appeal to the Court of Tax Appeals (CTA) within 30 days of receiving the decision. If no action is taken within the 30-day period, the FDDA becomes final, executory, and demandable. Additionally, if a final demand letter is issued by the BIR, it effectively denies any request for reconsideration and becomes appealable to the CTA.

9. Warrant of Distraint and/or Levy (WDL)

Once the Final Decision on Disputed Assessment (FDDA) is issued, the BIR can enforce tax collection through distraint, levy, or judicial action. Distraint allows the BIR to seize your property, including assets like goods, bank accounts, or stocks. The BIR may lift the order at its discretion, but enforcement can only proceed once the assessment is final and executory.

Collection proceedings are initiated once the FDDA is issued or if the Court of Tax Appeals (CTA) upholds the assessment. If you are still appealing, the BIR cannot enforce collection until the decision is final. It is thus critical for you to respond promptly to BIR audits, submit necessary documents, and stay aware of their rights to avoid enforcement actions.

Read Also:

You might also want to read other articles in our series:

How to Properly Respond to BIR Letters and Notices: A Taxpayer’s Practical Guide (Part 2).  Learn how to effectively respond to BIR letters and notices in this practical guide for taxpayers, avoid penalties, and handle tax issues with confidence.

How to Write Request Letters to Reduce BIR Penalties (Part 3). Get guidance on writing effective BIR request letters to reduce penalties, including tips, structure, and key points for clarity and professionalism.

… and you might just need our guidance and expertise.

Understanding and responding to BIR letters and notices can be nerve-wracking, especially with the deadlines and penalties involved. With FilePino’s tax compliance services, you don’t have to face these challenges alone. Our experienced team can help you interpret BIR communications, prepare accurate responses, and ensure full compliance with tax regulations—so you can avoid penalties and focus on growing your business.

Book a consultation with FilePino today! Call us at (02) 8478-5826 (landline) and 0917 892 2337 (mobile) or send an email to info@filepino.com.