Read the notice for three things first
Find three things in the notice: what discrepancy is alleged, how and by when you must respond, and what documents they want. Write those down in plain language and give a copy to your accountant and to whoever runs the business. The discrepancy usually takes one of two forms. Either the sales observed during the surveillance days have been projected across a month, a quarter or a year and the result is higher than your declared sales, or officers saw sales made without an invoice. Check that the period, store address and tax number cited are actually yours, and point out any error in your reply.
Use the deadline printed on the notice, not one you remember from somewhere else. Log the date you received it and who signed for it, and keep the envelope and any acknowledgment slip. If the notice asks for a meeting, note the time, the place and the documents requested. Where the legal English is unclear, have your accountant or lawyer walk you through it line by line rather than guessing.
What not to do: do not phone the individual named on the notice to "talk it over", do not hand original books to anyone who has not shown written authority, and do not admit verbally that you under-declared before you have reconciled anything. Keep communication in writing, and confirm any phone conversation with a follow-up email or letter.
It also helps to note who signed the notice and which revenue district office issued it, because your reply goes to that office and any follow-up meeting will be there. If the business has changed address or ownership since the period covered, say so early. A notice addressed to an old entity or a closed branch still needs an answer explaining the change, with proof.
Right away: preserve records, reconcile, name one contact
Do three things as soon as the notice arrives: preserve every sales record for the surveillance period exactly as it is, reconcile internally, and appoint one point of contact. Preserve point-of-sale journals and daily Z-readings, invoice and receipt stubs, cancelled invoices, e-invoicing records, card and e-wallet settlement reports, bank statements, staff rosters and purchase records for those days. Export and print them as they are and have them signed. Any later correction should be a separate explanatory note, never an edit to the original.
Reconcile day by day: how many invoices were issued, their total, how much arrived electronically, and how much cash was counted at close. If the surveillance report lists time slots or customer counts, match them slot by slot. The goal is not to prove you never missed a single receipt. It is to understand what actually happened, so you know whether the gap comes from method, from seasonality, or from genuinely unissued invoices.
Make your accountant, or a manager who understands the books, the single point of contact, so staff do not give conflicting accounts. An owner who is not comfortable in English can sign letters without fielding calls alone. For how books and source documents should be kept, see the books of accounts rules.
Tell staff in plain terms that a notice has arrived, that nobody should alter, discard or "tidy up" any receipt, and that any visitor or caller about tax goes straight to the named contact. Most self-inflicted damage at this stage comes from well-meaning employees reissuing receipts, deleting till entries or speaking to officers off the record.
Where the gap comes from: five legitimate explanations and one that is not
Most gaps come from the projection method. The observed days happened to fall on a peak season, a payday, a holiday or a promotion, and were then used to estimate a whole period. Your job is to show the real rhythm of the business with evidence: monthly sales for the past year, promotion dates and materials, mall traffic patterns and holiday opening hours. A second common cause is a mismatch in what was counted. Officers may have counted visitors or orders, while returns, cancellations, credit sales and split group orders all make invoices differ from foot traffic.
A third cause is scattered payment channels: card and e-wallet settlements land days after the sale, or a head office issues invoices centrally. A fourth is several outlets, a warehouse and online orders sharing one tax registration while the surveillance covered only one site. A fifth is timing, where a deposit is taken first and the invoice issued on delivery. Each explanation needs its own supporting document, not a single line saying "it was a sale day".
The explanation that does not work is a real sale made without an invoice. If reconciliation shows invoices were genuinely missed, do not deny it in the reply and do not issue back-dated invoices now. Work out the extent with your accountant and consider correcting the return voluntarily, together with the fixes you have made. See how an amended BIR return works. Coming forward usually leads to a very different outcome from being caught.
Put your explanation in numbers, not adjectives. A simple table comparing the surveillance days with the same weekdays in other weeks, and with the monthly average, persuades far more than a paragraph of reasons. Where the business genuinely grew, show the growth across your filed returns too, so the higher figure looks consistent rather than hidden.
Writing the reply: structure, exhibits and tone
Keep the reply short, number every exhibit, and tie every statement to a document. A workable structure: open with the notice number and date, your company name and tax number, and who is replying. Then answer each discrepancy in three parts: what the notice says, what actually happened, and which exhibit proves it. Next explain your own calculation, for example full-year monthly data instead of a projection from a few days. Close with a contact person and an offer to provide more documents.
Number the exhibits and list them on a cover page: daily sales summaries, copies of invoice stubs, electronic settlement reports, proof of promotions and holidays, a breakdown between outlets and online orders, and your recent returns. Mark copies as compared with the originals and have them signed. Keep the originals unless the BIR asks for them in writing.
Stay factual. Do not criticise the officers and avoid empty lines such as "we have always complied". If English is a barrier, draft the facts in your own language and have your accountant or lawyer prepare the final letter. Get a receiving copy or keep the email trail when you submit. A solid day-to-day bookkeeping routine makes all of this easier; see what bookkeeping and filing cover in the Philippines.
Before sending, read the reply against the notice one last time and confirm every alleged item has an answer. A reply that skips an item is often treated as conceding it. Keep a complete set of exactly what you submitted, in the same order and with the same numbering, because later meetings will refer to it page by page.
After you reply: meetings, more documents, or escalation
Submitting the reply is not the end. Expect a meeting, a request for more documents, or acceptance and closure. Bring copies of the letter and exhibits to any meeting, attend with your accountant, answer only the factual questions asked, and say you will confirm in writing when you are unsure. After every meeting, email a short summary of what was discussed and what you agreed to provide, and by when.
If your explanation is not accepted, the next step may be a formal audit under a Letter of Authority. That process and your rights within it are covered in the BIR LOA audit process. Where officers believe invoices are routinely not issued, closure measures may come into play; background is in BIR closure operations. You may also receive an order to produce your books first; see receiving a BIR Subpoena Duces Tecum.
At no stage should you pay anyone privately to make the matter go away. It does not erase the record, and it turns an explainable tax question into a criminal exposure. If anyone hints they can "handle it" for you, decline politely, write down what happened and tell your lawyer.
Keep a running log of every contact: date, who you dealt with, what was asked and what you sent. If the matter does escalate, this log and your written reply become the backbone of your file, and your accountant or lawyer can pick it up immediately instead of reconstructing months of exchanges from memory. Set calendar reminders for every date the BIR gives you, and confirm each submission by email the same day.
Preventing the next gap, and how Yixing can help
The way to avoid another surveillance gap is to make every sale leave a trail that reconciles. Link the till to invoicing so nobody takes money now and invoices later. Reconcile electronic settlements daily and note the reason for any difference the same day. Flag promotions, group purchases, pre-orders and credit sales separately. Write down which entity invoices for each outlet and for online orders. Have your accountant compare sales, invoices and returns every month.
Train store staff too: issue an invoice even when the customer does not ask for one, never tear up a cancelled invoice, and hand over invoice booklets with a signature at shift change. Keep the registration certificate and the "ask for receipt" notice displayed at all times and replace them quickly if lost; see replacing a lost BIR registration certificate. Apply for new invoice booklets before you run out; see when invoices run out before the new authority arrives.
Yixing (SEC registration CS202009551, Bureau of Immigration accredited agent CA-202624381-1) offers tax compliance and incentive support to Chinese-owned businesses in the Philippines: organising sales records, reconciliation tables and reply exhibits for the surveillance period, coordinating licensed accountants and lawyers to draft the reply and attend meetings, and setting up daily invoicing and reconciliation routines. We are not a tax authority, we promise no particular outcome, and we do not replace professional advice. For your specific case consult a licensed lawyer or CPA; this article is not legal or tax advice.
Run a short internal spot check once a quarter: pick a random day, reconcile the till, the invoices and the bank settlements, and fix any gap you find. Businesses that do this rarely receive a surveillance notice they cannot answer, because the explanation already exists before anyone asks for it.
Frequently Asked Questions
Is BIR surveillance legal, and what authority do officers need?
The notice says we under-declared. Do we automatically owe tax?
Can we write the reply in Chinese?
What if we missed the reply deadline?
An officer hinted it could be settled privately. What should we do?
Do we have to hand over our original books with the reply?
Do small shops get surveilled too?
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