Documents You Should Prepare Before a BIR Audit in the Philippines

Executive Summary

A BIR audit can involve much more than reviewing a single tax return.

The Bureau of Internal Revenue has authority under the Tax Code to examine books, records, papers, and other information relevant to determining whether a taxpayer correctly reported and paid taxes.

For business owners, the best preparation is not to wait until a revenue officer requests documents.

Your tax returns, books of accounts, invoices, financial statements, withholding records, and supporting documents should already be organized and consistent with one another.

Use this checklist as a practical starting point before responding to a BIR audit.

1. Start With the Letter of Authority and BIR Notices

Before gathering accounting records, review the documents that started the audit.

Keep a copy of the Letter of Authority (LOA) and any subsequent BIR notices, requests, correspondence, or schedules.

Check the taxpayer name, TIN, taxable period, tax types involved, and the revenue officers assigned to the examination.

This helps determine which documents are relevant and prevents the company from treating the audit as an unlimited request for every record it possesses.

2. Prepare Your BIR Registration Records

Your registration records help establish how the business is registered and what compliance requirements apply.

Prepare the corporation’s or business’s registration information, including its TIN and relevant BIR registration documents.

You should also review records relating to your books of accounts, Authority to Print invoices, computerized accounting system, loose-leaf books, or POS system, where applicable. The BIR currently treats these as separate registration and compliance matters.

Make sure your actual business operations are consistent with your registered information.

3. Gather Tax Returns for the Audit Period

Prepare copies of all tax returns relevant to the period being examined.

These may include annual and quarterly income tax returns, VAT or percentage tax returns, withholding tax returns, and other applicable filings.

Do not review each return by itself.

Compare them with one another and with your accounting records.

For example, sales reported in your VAT returns should be explainable when compared with sales reflected in your general ledger and annual income tax return.

Large unexplained differences can become an audit issue.

4. Prepare Your Books of Accounts

Your books are among the most important records in a tax audit.

Depending on your accounting system, these may include the general journal, general ledger, subsidiary ledgers, sales and purchase records, or computerized accounting data.

The BIR maintains formal procedures for registration of books of accounts, including computerized accounting systems and loose-leaf records.

Before the audit, make sure entries in your books can be traced to the financial statements, tax returns, and supporting documents.

5. Organize Sales Invoices and Revenue Records

Sales are often a key focus in tax examinations.

Prepare the invoices issued during the taxable period together with relevant sales schedules and accounting records.

Review cancelled invoices, credit adjustments, sales returns, discounts, and unusual transactions.

Your business should be able to answer a basic question:

How did the sales reported in the tax returns come from the underlying transactions?

The Tax Code authorizes examination of records relevant to determining the correctness of a return or tax liability.

6. Prepare Purchase and Expense Documents

Major deductions should be supported.

Depending on the transaction, this may involve invoices, contracts, purchase orders,

delivery receipts, proof of payment, billing statements, and other evidence showing that the expense was actually incurred for the business.

Pay special attention to significant expenses such as professional fees, rentals, advertising, repairs, commissions, management fees, travel, and purchases from major suppliers.

An invoice alone may not always answer every audit question.

The company should also be able to explain the business purpose and actual transaction behind the expense.

7. Review Withholding Tax Documents

Businesses often act as withholding agents.

Prepare the relevant withholding tax returns, certificates issued to payees, alphalists or supporting schedules, and accounting records relating to payments subject to withholding.

Compare payments recorded in the books with the withholding tax treatment.

For example, if professional fees or rentals appear as expenses in the accounts, determine whether the appropriate withholding tax was considered and reported.

Inconsistencies between expenses and withholding returns may require explanation.

8. Prepare VAT or Percentage Tax Records

If the business is VAT-registered, organize both sales and purchase records relevant to output and input VAT.

Input VAT claims should be supported by the underlying transactions and appropriate documentation.

For businesses subject to percentage tax, compare gross sales reported in the tax returns with the company’s books and other revenue records.

Again, the goal is consistency.

Tax return → accounting record → invoice → transaction evidence should be reasonably traceable.

9. Prepare Financial Statements and Supporting Schedules

Keep copies of the financial statements covering the audit period.

Review the balance sheet, income statement, notes, and supporting schedules together with the tax returns and books.

Pay particular attention to large balances such as:

cash and bank accounts;

receivables;

inventory;

loans;

advances;

related-party balances;

taxes payable; and

significant operating expenses.

If accounting income differs from taxable income, prepare a clear explanation of the tax adjustments.

10. Organize Bank and Payment Records

Payment records may help establish whether reported transactions actually occurred.

Where relevant to the audit, organize bank statements, checks, transfer confirmations, official payment records, and other supporting evidence.

Do not assume, however, that every company bank record should automatically be turned over without reviewing the BIR request and applicable legal considerations.

First determine what the audit actually requires.

11. Prepare Contracts and Major Transaction Documents

Large or unusual transactions usually deserve special attention.

Prepare agreements relating to major purchases, rentals, loans, services, asset sales, related-party transactions, and other significant business activities.

These documents can help explain why money was paid or received and how the transaction was treated for tax purposes.

If an accounting entry reflects a transaction but no one can locate the underlying agreement or supporting documents, investigate the issue before responding to the BIR.

12. Review Payroll and Employee Records

Where payroll and withholding taxes are relevant, organize payroll registers, employment records, compensation schedules, withholding certificates, and proof of remittance.

Check whether compensation figures reported to the BIR can be reconciled with the company’s payroll records and financial statements.

Any material difference should be identified before submission.

13. Review Related-Party Transactions

Transactions with owners, shareholders, directors, officers, affiliates, or related companies can receive additional scrutiny.

Prepare documentation supporting management fees, advances, intercompany loans, reimbursements, rentals, transfers of property, and similar transactions.

The company should be able to explain the business purpose, accounting treatment, and tax treatment of each significant related-party transaction.

14. Prepare Your Reconciliations

Reconciliations can be just as important as the underlying documents.

Prepare schedules explaining differences between:

VAT sales and book sales → withholding returns and expenses → financial statement revenue and tax returns → purchases and input VAT → payroll and compensation returns.

A difference is not automatically wrong.

But if the difference exists, management should understand why.

15. Keep Proof of Tax Payments and Filings

Prepare proof that the company actually filed and paid its taxes.

Keep electronic filing confirmations, payment confirmations, bank records, official receipts where applicable, and copies of the filed returns.

This is particularly important when the BIR’s records appear to show a missing filing or payment.

16. Create a Record of What You Submit During the Audit

Do not hand over documents without keeping your own record.

Maintain a submission log showing what was provided, when it was submitted, and in response to which BIR request.

Keep copies of letters, schedules, attachments, receiving copies, and electronic acknowledgments.

If questions arise later, the company should be able to establish exactly what information was given to the BIR.

Practical Example

Suppose the company reported ₱15 million in sales in its annual income tax return.

During preparation for the audit, management discovers that the general ledger shows ₱15.5 million while the VAT returns total ₱15.2 million.

The right response is not to hide the differences.

The company should determine why they exist.

Perhaps one difference relates to timing, accounting classification, exempt transactions, or an adjustment recorded at year-end.

Once the reason is identified, prepare a reconciliation supported by the appropriate records.

A clear reconciliation can turn what initially appears to be a suspicious inconsistency into an understandable accounting or tax difference.

Common Mistakes Before a BIR Audit

One common mistake is submitting documents immediately without reviewing whether they are complete and consistent.

Another is allowing different employees to respond separately without coordination.

Businesses should also avoid recreating, altering, backdating, or fabricating documents after an audit has started.

If records are missing, identify the problem and determine what legitimate supporting evidence is available.

Preparation should improve organization not change historical records.

Quick BIR Audit Document Checklist

Before responding, make sure you have reviewed:

LOA and BIR notices → registration records → tax returns → books of accounts → sales invoices → purchases and expenses → withholding records → VAT or percentage tax records → financial statements → bank and payment records → contracts → payroll → related-party transactions → reconciliations → filing and payment confirmations.

The exact documents required will depend on the taxpayer, taxable period, tax type, transactions involved, and scope of the BIR examination.

Frequently Asked Questions

Does the BIR have authority to examine business records?

Yes.

The Tax Code authorizes the Commissioner to examine books, papers, records, and other data relevant to determining the correctness of returns, tax liability, collection, and tax compliance.

Should I give the BIR every document my company has?

Not automatically.

First review the scope of the audit and the specific request. Determine which documents are responsive and relevant, and seek professional advice when the request raises legal, confidentiality, or procedural concerns.

What if my books and tax returns do not match?

Do not ignore the difference.

Prepare a reconciliation explaining why the amounts differ and gather documentation supporting the explanation.

What if some documents are missing?

Identify the missing records immediately.

Look for legitimate supporting records such as contracts, payment confirmations, delivery documents, accounting entries, or other contemporaneous evidence.

Do not create false documents to replace records that no longer exist.

Yes.

Reviewing them helps identify inconsistencies, incomplete schedules, wrong periods, and documents outside the scope of the audit.

The objective is not to conceal information. It is to make sure the company provides an accurate, organized, and legally appropriate response.

Final Thoughts

Preparing documents before a BIR audit in the Philippines is not simply a matter of putting invoices into folders.

The real objective is to determine whether the company’s records tell a consistent story.

Your tax returns, books of accounts, invoices, financial statements, withholding records, contracts, and payment documents should support one another.

The BIR has broad statutory authority to examine relevant records and obtain information when evaluating tax compliance.

Businesses that maintain organized records throughout the year are better prepared to explain their transactions when an examination begins.

Do not prepare for a BIR audit by creating new records. Prepare by understanding and organizing the records you already have.

Need Assistance Preparing for a BIR Audit?

Aureada CPA Law Firm can assist businesses with BIR audit preparation, Letter of Authority review, tax reconciliations, documentary review, assessments, and related tax compliance matters.