What Happens If You Have No Receipts to Prove Your Business Expenses? The BIR's Best Evidence Obtainable Rule

Having no receipts doesn’t mean the BIR simply gives up on assessing your tax — NIRC Section 6(B) lets the Commissioner assess “the proper tax on the best evidence obtainable” when a taxpayer’s required records are missing or unreliable, reconstructing your tax base from whatever reasonable evidence is available instead. For a small business owner who’s been loose with recordkeeping, that’s the real cost of skipping documentation: not that the BIR can’t act, but that the BIR gets to decide what your numbers were.

What does Section 6(B) actually let the BIR do? #

NIRC Section 6(B) authorizes the Commissioner to assess tax using the best evidence reasonably available when the taxpayer’s required report or records don’t show up, or when what’s submitted appears false, incomplete, or erroneous. The provision states:

“…when there is reason to believe that any such report is false, incomplete or erroneous, the Commissioner shall assess the proper tax on the best evidence obtainable.” — NIRC Section 6(B)

This isn’t limited to a missing sales report — it applies just as directly to a small business owner whose expense side has no substantiation at all. If you can’t produce any adequate record for what you claimed to have spent, an examiner isn’t required to simply accept the claimed number; Section 6(B) gives them a legal basis to reconstruct it from other sources instead.

What kind of evidence can the BIR actually use? #

“Best evidence obtainable” can include third-party records or testimony, data from other, similarly situated taxpayers, and other indirect evidence reasonably available to the examiner — evidence that would often be inadmissible hearsay in an ordinary court proceeding but is permitted in this specific assessment context. There are real limits, though:

• It has to be the best evidence reasonably available under the circumstances, after the BIR has exhausted the ordinary means of examining the taxpayer’s own records — not whatever is merely convenient.
• Mere photocopies of records or documents do not qualify as best evidence obtainable on their own.
• If a taxpayer refuses to submit records and a subpoena duces tecum is issued, the BIR generally proceeds to assessment only after a criminal case for failure to obey the summons has been instituted — a procedural safeguard showing the rule isn’t meant to be invoked casually or as a first resort.

A worked example: an online reseller with incomplete records #

A small online reseller keeps sales screenshots but almost no documentation for the cost of goods sold — inventory bought in bulk from various suppliers, mostly paid in cash with nothing kept. During an audit, the examiner can’t verify the claimed cost of goods sold because there’s no purchase log, no vouchers, and no supplier records on the reseller’s side. Under Section 6(B), the examiner is entitled to reconstruct a reasonable cost basis using indirect evidence — comparable gross profit margins for similar online resale businesses, supplier information obtained through third-party verification, or other available industry data — rather than accept the reseller’s unsupported claimed figure. The reconstructed cost basis, built from indirect sources instead of the reseller’s own records, is very unlikely to be as favorable as what accurate contemporaneous documentation would have shown.

How do you avoid ending up here? #

The Section 6(B) risk is really a downstream consequence of the substantiation gap covered in Can You Deduct Business Expenses Without an Official Receipt? BIR Rules for Sole Proprietors — keeping “other adequate records” for every expense, even informal ones, is what keeps an examiner working from your numbers instead of a reconstruction. For a business with genuinely sparse documentation across the board, the Optional Standard Deduction sidesteps the problem differently: instead of substantiating itemized expenses at all, a taxpayer electing OSD claims a flat 40% of gross sales or receipts, removing the itemized-substantiation exposure entirely — see Optional Standard Deduction (OSD) vs. Itemized Deductions: Which Should You Choose? for whether that trade-off makes sense for your numbers. And because the underlying records themselves are what an examiner is checking for, see BIR Books of Accounts: Manual, Loose-Leaf, and Computerized Accounting System Requirements for what the BIR expects to be kept in the first place.

Frequently asked questions #

Does the BIR still tax you if you have no receipts at all? #

Yes — and potentially on a basis less favorable than your own records would have shown. NIRC Section 6(B) authorizes the Commissioner to assess the proper tax on “the best evidence obtainable” when required records aren’t forthcoming or are false, incomplete, or erroneous, which includes reconstructing your income and expenses from third-party sources rather than accepting an unsupported claim.

What counts as “best evidence obtainable” under Section 6(B)? #

It can include records or testimony from third parties, data from other taxpayers similarly situated to you, industry benchmarks, and other indirect evidence the examiner can reasonably access — evidence that would often be inadmissible hearsay in a regular court but is allowed in this specific tax-assessment context. It does not include mere photocopies of documents standing in place of the originals, and it isn’t meant to be whatever is merely convenient for the examiner.

Can the BIR use best evidence obtainable any time it wants? #

No. The rule applies only when specific conditions are met — the taxpayer’s required report or records aren’t forthcoming (lost, refused, or simply never kept), or the records submitted are false, incomplete, or erroneous. It isn’t a shortcut available whenever an examiner would prefer not to review a taxpayer’s actual books.

How do I avoid a best evidence obtainable assessment? #

Keep contemporaneous records for every deductible expense, even informal ones — a purchase log, vouchers, payment confirmations — rather than relying on memory or after-the-fact reconstruction (see Can You Deduct Business Expenses Without an Official Receipt?). If you genuinely can’t substantiate most of your itemized expenses, electing the Optional Standard Deduction removes the substantiation burden for the deduction side entirely, since it’s a flat percentage rather than itemized proof.

If the BIR assesses me this way, is that the final word? #

No. A best evidence obtainable assessment is still subject to the normal protest and appeal process — a taxpayer who disagrees can contest it through a formal protest to the BIR and, if needed, further review at the Court of Tax Appeals, the same as any other assessment. The taxpayer can also submit better evidence during that process to challenge the examiner’s reconstruction.

Summary #

NIRC Section 6(B) exists precisely for the situation this whole series has been building toward: what happens when a small business owner’s documentation habit finally runs out. The BIR doesn’t need your receipts to assess you — it needs a reasonable basis, and Section 6(B) lets it construct one from whatever’s obtainable when your own records fall short. The cheaper alternative, every time, is keeping the “other adequate records” this series has covered — a log, a voucher, a payment confirmation — before an examiner ever has to reach for someone else’s numbers instead of yours.