Does a payee's ATC on QAP have to stay the same all year?

No. The Alphanumeric Tax Code on a QAP row describes the income payment reported in that specific quarter, not a fixed label permanently attached to the payee. If what you buy from that supplier changes — say, from goods only to goods plus a service — later quarters simply use whichever ATC matches that quarter's actual transactions.

Do I need to amend my earlier QAP filings when a payee's ATC changes in a later quarter?

No, not solely because of the change itself. If each earlier quarter's QAP row correctly matched what was actually paid and withheld in that quarter, nothing about a later quarter's different ATC makes those earlier filings wrong. You only amend a quarter if that specific quarter's row was itself incorrect.

Is this the same situation as reporting one payee under two ATCs in the same quarter?

No — that's a related but different case. Reporting the same payee twice in one quarter because two different income types were paid in that same three-month period is covered in Same Payee, Two ATCs. A mid-year ATC change is about a payee whose classification shifts from one quarter to a later quarter, not within a single quarter.

What ATC do I use once a goods-only supplier starts also billing for a service?

Each income type keeps its own ATC in the quarter it's actually paid. A goods purchase stays under the goods ATC (for example WC160/WI160 if the payor is a Top Withholding Agent) and a new service fee gets its own services ATC (such as WC120/WI120 for a general contractor-type service), even if both amounts happen to involve the same supplier in the same quarter going forward.

Will a validation error flag a payee that shows up under a different ATC than in a prior quarter?

No. The BIR's Alphalist Data Entry and Validation Module checks each quarter's file on its own terms — TIN format, ATC validity for the amount and category, and internal totals — not continuity of a payee's ATC across separate quarterly files, since QAP itself is filed one quarter at a time.

Does the payee's BIR Form 2307 need to show the ATC changed from a prior quarter?

No, each BIR Form 2307 only needs to correctly state the ATC and amount for the period it actually covers. A Q3 certificate showing a new service ATC doesn't need to reference or reconcile against a Q1 certificate that only showed the goods ATC — each certificate stands on its own quarter's transactions.

QAP: How to Report a Payee Whose ATC Code Changes Mid-Year

A payee’s Alphanumeric Tax Code (ATC) on QAP (the Quarterly Alphalist of Payees) can legitimately differ from one quarter to the next, because the ATC describes the income payment made in that quarter — not a label permanently fixed to the payee. A supplier who starts the year as a goods-only vendor and later also bills for a service doesn’t need to be reclassified or have earlier quarters amended; each quarter simply reports whatever ATC actually matches that quarter’s transactions.

This guide is part of the site’s broader coverage of QAP filing. It explains why the ATC is tied to the transaction rather than the payee, works through a supplier that shifts from a 1% goods rate to also carrying a 2% service rate partway through the year, and distinguishes this from the related same-quarter, two-ATC scenario covered elsewhere on this site.

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Why would the same payee show a different ATC in a later quarter? #

The ATC exists to classify the income payment, not the payee, so any change in what you actually buy from a supplier during the year shows up as a different ATC in whichever quarter that new transaction type first occurs. Under Revenue Regulations (RR) No. 2-98, as amended by RR No. 11-2018, the rate and code applied to a payment depend on the nature of that specific income — purchase of goods, purchase of services, rental, professional fee, and so on — determined transaction by transaction.

A supplier relationship is rarely static for an entire calendar year. Common reasons a payee’s ATC shifts between quarters include:

A goods vendor starts also providing installation, delivery, or maintenance labor — a service component that didn’t exist in the earlier quarters.
A Top Withholding Agent designation changes mid-year, shifting the rate bracket on goods or services purchased from that payee going forward (see Who Is a BIR Top Withholding Agent?).
A one-off professional engagement is added to an otherwise purely goods-based account, such as a hardware supplier who is separately engaged to consult on a renovation.

None of these require updating the payee’s “classification” anywhere, because QAP has no such standing classification to update — only quarterly rows, each independently correct for the quarter it covers.

Do earlier quarters need to be amended when a later quarter’s ATC is different? #

No — not because the ATC changed. Each quarter’s QAP row is judged on whether it correctly reported that quarter’s actual payments, not on whether it matches the ATC used in an earlier or later quarter. A withholding agent only has a reason to amend a specific quarter if that quarter’s own row was wrong when filed — a mismatched rate, an incorrect amount, or the wrong code for what was actually paid in that period.

“The return filed shall be accompanied by the Quarterly Alphabetical List of Payees (QAP), reflecting the name of income payees, Taxpayer Identification Number (TIN), the amount of income paid segregated per month with total for the quarter, and the total amount of taxes withheld, if any.”
— Section 2.58, Revenue Regulations No. 2-98, as amended by Revenue Regulations No. 11-2018, as quoted in tax-practitioner commentary summarizing the regulation

Because the provision ties each quarter’s alphalist to that quarter’s own payments and amounts withheld, a later quarter introducing a new ATC for the same TIN is simply a new, independent row for a new transaction type — not evidence that an earlier quarter needs correction. This is the same quarter-by-quarter logic covered in Who Must File QAP?: the filing obligation, and the data that supports it, resets and stands on its own every three months.

Worked example: a goods supplier that adds a service fee in Q3 #

The scenario below is fictional, built only to show how a payee’s ATC can change between quarters without requiring any correction to the quarters that came before. Meridian Hardware Supply Corp. (fictional TIN 789-012-345-000) sells construction materials to Castillo Builders Inc., a Top Withholding Agent, throughout 2026.

Q1 2026: Castillo buys ₱150,000 in materials from Meridian. Reported under ATC WC160 (goods purchase, Top Withholding Agent, 1%) — tax withheld ₱1,500.
Q2 2026: Castillo buys another ₱180,000 in materials from Meridian. Again reported under WC160 — tax withheld ₱1,800.
Q3 2026: Castillo again buys ₱120,000 in materials from Meridian (still WC160, ₱1,200 withheld) — but this quarter Meridian’s crew also handles ₱25,000 of on-site installation labor for a separate job, which is a service payment reported under ATC WC120 (general contractor/service-type payment, 2%) — tax withheld ₱500.

Quarter	Payee (fictional)	TIN (fictional)	ATC	Income	Rate	Tax withheld
Q1	Meridian Hardware Supply Corp.	789-012-345-000	WC160	₱150,000.00	1%	₱1,500.00
Q2	Meridian Hardware Supply Corp.	789-012-345-000	WC160	₱180,000.00	1%	₱1,800.00
Q3	Meridian Hardware Supply Corp.	789-012-345-000	WC160	₱120,000.00	1%	₱1,200.00
Q3	Meridian Hardware Supply Corp.	789-012-345-000	WC120	₱25,000.00	2%	₱500.00

Nothing about the Q3 WC120 row requires Castillo to revisit or refile Q1 or Q2 — those quarters correctly reported goods purchases only, because that’s all that happened in those quarters. Q3 simply adds a second, correctly coded row for the new service income, the same one-row-per-ATC-per-quarter structure used when a single quarter has two income types for one payee, as shown in Same Payee, Two ATCs.

What should you double-check before filing a quarter where a payee’s ATC changes? #

The only real risk in this scenario is misapplying the old ATC to the new income type out of habit, not any special procedural step tied to the change itself. Before submitting a quarter where a long-standing payee’s transactions have shifted:

Confirm the nature of each payment made to that payee in the quarter — goods, services, rental, professional fee — independent of what was reported in prior quarters.
Assign the ATC that matches each payment type, not the ATC the payee carried previously, especially if a Top Withholding Agent rate bracket is involved.
Keep the supporting BIR Form 2307 for each ATC consistent with that quarter’s amount and rate, so the certificate and the QAP row agree.
Leave prior quarters untouched unless those specific quarters’ own rows were incorrect when filed — a new ATC in a later quarter is not, by itself, a defect in an earlier one.

Summary #

A payee’s ATC on QAP tracks the income payment made in a given quarter, not a fixed classification carried forward from quarter to quarter — so a supplier that starts the year under one ATC and later also bills for a different income type simply picks up a second, correctly coded row in whichever quarter that new transaction first occurs, under Section 2.58 of RR No. 2-98 as amended by RR No. 11-2018. Earlier quarters don’t need amendment just because a later quarter looks different; they only need amendment if they were wrong on their own terms. For the filing obligation this builds on, see Who Must File QAP?, and for the related same-quarter case, see Same Payee, Two ATCs.