Executive Summary

Tax problems often begin long before a business receives a Letter of Authority, Notice of Discrepancy, or assessment from the Bureau of Internal Revenue.

Many issues can already be seen in the company’s books, invoices, tax returns, withholding records, bank transactions, and registration documents.

A discrepancy does not automatically mean tax fraud or tax evasion. It may result from bookkeeping mistakes, incomplete documentation, system changes, or incorrect tax treatment. But if the issue is not identified early, a small accounting problem can become a larger BIR tax compliance risk.

Under the Ease of Paying Taxes Act, businesses remain responsible for proper invoicing, recordkeeping, filing, and payment. Books of accounts and related accounting records generally must be preserved for five years.

Here are seven red flags every business owner should review before the BIR does.

Step-by-Step Guide: 7 Tax Compliance Red Flags to Check

1. Sales in the Books Do Not Match Tax Returns

One of the first areas to review is whether sales reported in the accounting records agree with the amounts declared in VAT, percentage tax, and income tax returns.

Differences are not always improper. Timing differences, credit notes, adjustments, and accounting classifications may explain them.

The problem arises when the business cannot reconcile the numbers.

A company should be able to explain how its invoices, sales register, general ledger, tax returns, and financial statements connect.

If different records show materially different sales figures without a documented explanation, the discrepancy may attract BIR scrutiny.

2. Bank Deposits Are Significantly Higher Than Recorded Revenue

Large unexplained bank deposits can create questions during an audit.

Not every bank deposit is taxable income. Deposits may include shareholder advances, loans, transfers between accounts, capital contributions, reimbursements, or other non-revenue transactions.

But these explanations should be supported.

If a business reports ₱10 million in sales while its bank accounts show ₱16 million in deposits, management should know exactly what makes up the ₱6 million difference.

The risk is not simply having additional deposits. The red flag is being unable to explain them with reliable records.

3. Major Expenses Have Weak or Missing Supporting Documents

A general ledger entry does not prove that an expense is deductible.

Businesses should be able to establish what the expense was, who was paid, why it was connected to the business, and what documents support the transaction.

During current BIR audit procedures, revenue officers may examine invoices, purchase records, expense vouchers, delivery documents, withholding certificates, books of accounts, and other accounting records.

This means large consulting fees, management charges, rentals, commissions, reimbursements, purchases, and other significant deductions deserve particular attention.

An actual payment may still become difficult to defend if the underlying transaction cannot be properly substantiated.

4. VAT Invoices and Accounting Records Do Not Match

VAT compliance is especially documentation-sensitive.

Under the Ease of Paying Taxes reforms, the invoice is now the principal document for sales of both goods and services. VAT-registered persons must issue a VAT invoice for taxable sales, while current BIR rules prescribe the information required in the invoice.

A business should therefore review whether:

its VAT invoices agree with sales records;purchase invoices support claimed input VAT; andthe amounts reported in VAT returns reconcile with the books.

An invoice error does not automatically destroy every VAT claim, because current law distinguishes between different types of missing information. But certain deficiencies can still create compliance exposure.

5. Withholding Taxes Do Not Reconcile With Expenses or Payroll

Withholding tax is another common source of BIR discrepancies.

If the books show large professional fees, rentals, commissions, salaries, or supplier payments, the corresponding withholding treatment should be reviewed.

Questions arise when:

the expense exists in the books but no withholding was recorded;the amount withheld differs from the underlying payment; orwithholding certificates, returns, and accounting records show inconsistent amounts.

The Tax Code requires withholding agents to file returns and remit taxes withheld in accordance with the applicable rules.

For business owners, this means withholding compliance should be reconciled with the actual accounts payable and payroll records not handled as an entirely separate tax process.

6. Returns or Payments Are Frequently Late

Repeated late filing is a clear compliance warning sign.

It may indicate weak internal controls, incomplete accounting records, cash-flow problems, or a misunderstanding of filing obligations.

Under Section 248 of the Tax Code, late filing or payment can generally result in a 25% civil penalty, in addition to the underlying tax and applicable interest. Micro and small taxpayers are entitled to a reduced 10% civil penalty under the Ease of Paying Taxes Act.

A business that frequently files late should not simply treat penalties as a recurring cost.

Management should determine why deadlines continue to be missed.

7. The Business Cannot Quickly Produce Its Books and Supporting Records

A business may be filing returns correctly but still face problems if its records are scattered, incomplete, or inaccessible.

The Tax Code generally requires books of accounts and other accounting records to be preserved for five years from the applicable statutory reckoning date.

Current BIR audit procedures also contemplate examination of books, sales and purchase records, vouchers, invoices, and electronic accounting records.

A strong compliance system should allow the company to locate important records without reconstructing years of transactions after an audit begins.

This is increasingly important for businesses using computerized accounting systems, electronic records, and newer invoicing technologies.

Risks and Penalties

These red flags do not automatically establish a tax violation. But leaving them unresolved can increase several types of exposure.

A business may face disallowed deductions, questioned input VAT, deficiency income tax, VAT or withholding tax assessments, surcharge, interest, and compromise penalties depending on the violation.

Repeated late filing or payment may trigger statutory civil penalties. More serious cases involving willful neglect or false or fraudulent returns may carry significantly greater consequences.

There is also a practical risk: weak records make it harder to defend a correct tax position.

Under the BIR's 2026 audit framework, a Notice of Discrepancy should identify the issues noted and provide the taxpayer a reasonable opportunity to explain and submit supporting documents before unresolved issues move further into the assessment process.

That opportunity is much more valuable when the supporting records already exist.

Practical Examples

Example 1: Unexplained Bank Deposits

ABC Corporation reports ₱20 million in sales but has ₱24 million in total deposits.

After review, the company discovers that ₱3 million represents shareholder loans and ₱1 million represents transfers from another company account.

If the loan agreements and transfer records are properly maintained, the discrepancy may be explainable.

Without those documents, the same deposits may require a much more difficult defense.

Example 2: Consulting Fees Without Complete Documentation

A company records ₱1.5 million in consulting fees.

It can produce the bank transfers but cannot locate the engagement letter, invoices, reports, or other evidence showing what services were performed.

The expense may have genuinely occurred, but its deductibility may become harder to establish.

Example 3: VAT Records Do Not Reconcile

The purchase ledger shows ₱700,000 in input VAT while the VAT return claims ₱900,000.

The difference came from a spreadsheet adjustment that was never reconciled with the actual invoices.

The issue may be an accounting mistake rather than fraud but it should be corrected and documented before it becomes part of a BIR audit.

Example 4: Expense Recorded but No Withholding Tax

A company pays professional fees throughout the year and records the full expenses correctly.

However, the accounting team discovers that some payments were never included in the appropriate withholding tax process.

This creates a separate tax compliance issue even though the expense itself may be genuine.

Frequently Asked Questions

Does a tax compliance red flag automatically mean the business violated the law?

No.

A red flag simply means an item deserves further review.

Some discrepancies have legitimate explanations. The important question is whether the business can support that explanation with consistent accounting records and applicable tax rules.

Should businesses wait for a BIR audit before reconciling their records?

No.

The better approach is to conduct periodic tax compliance reviews before an audit begins.

Once a Notice of Discrepancy or assessment is issued, the business may be working under procedural deadlines while also trying to reconstruct old transactions.

How often should tax accounts be reconciled?

For active businesses, key tax-sensitive accounts should ideally be reviewed regularly rather than only at year-end.

Sales, VAT, withholding taxes, bank transactions, payroll, purchases, and major expense accounts deserve particular attention.

How long should accounting records be kept?

The current general rule under Section 235 of the Tax Code is five years, subject to special circumstances where records may need to be retained longer, such as where they remain relevant to an unresolved tax matter.

Can poor accounting records lead to a tax assessment even if there was no fraud?

Yes.

A taxpayer may face a deficiency assessment because of incorrect reporting, unsupported deductions, documentation problems, or other compliance failures even where fraudulent intent is absent.

Fraud is a separate and more serious allegation that requires its own legal and factual basis.

Call-to-Action

Are There Tax Red Flags Hidden in Your Books?

The best time to identify a tax discrepancy is usually before the BIR identifies it for you.

A preventive review can help determine whether differences in sales, bank deposits, VAT, withholding taxes, expenses, and accounting records are genuine tax deficiencies or issues that can be properly reconciled and documented.

Aureada CPA Law Firm assists businesses with tax compliance reviews, BIR audits and assessments, accounting-record analysis, VAT and withholding tax issues, tax risk management, and administrative and judicial remedies.