BIR RMC No. 112-2026 Explained: What Businesses Need to Know About CWT on Invoices

Last updated: October 23, 2026. This is general information, not tax or legal advice. This circular is very new, so check the official text before acting on any deadline.

A bookkeeper I know called me last week, half laughing and half stressed. "I was about to send an invoice to a corporate client," she said, "and I suddenly wasn't sure whether the withholding tax line goes on it. And if it does, where? And what do I call it?"

If that sounds familiar, you're not alone. Two BIR issuances arrived within weeks of each other: first Revenue Regulations (RR) No. 6-2026, which says invoices must show creditable withholding tax (CWT) as a separate item when it applies, then Revenue Memorandum Circular (RMC) No. 112-2026, which explains how to actually do it. Meanwhile, the December 31, 2026 e-invoicing deadline is also on the calendar.

So here's a plain-English walkthrough of what RMC 112-2026 says, who it affects, and what to do about it.

Quick Summary

If you only have a minute, here's the short version:

• RMC 112-2026 clarifies how CWT must be presented on sales invoices under RR 6-2026.
• CWT goes on the invoice only when the transaction is actually subject to CWT. It isn't required on every invoice.
• You can describe it with wording like "Less: Withholding Tax," "Less: Creditable Withholding Tax," or "Less: CWT."
• Unused manual invoices generally don't have to be thrown away, as long as you add the required CWT wording when it applies.
• If you use a POS, CRM, or accounting system, it needs to be able to capture and show CWT, and there are transition periods.
• The deadlines need checking against the official text, which I'll explain below.

First, What Is Creditable Withholding Tax?

Let's start with the basics, since the term sounds scarier than it is.

Creditable withholding tax is income tax that a buyer holds back from a payment to a seller and sends to the BIR on the seller's behalf. The seller can then use that withheld amount as a credit against their own income tax.

Here's a simple way to picture it. Say you bill a corporate client ₱100,000 for a service. Their accounting team is required to withhold a small percentage, so instead of paying you the full amount, they pay you a bit less and give you a certificate (BIR Form 2307) proving they sent the difference to the BIR. You later claim that amount as a credit.

Before the new rules, many businesses added a withholding tax line to their invoices out of habit, but it wasn't mandatory. That's what changed.

How We Got Here: RR 6-2026

RR 6-2026 amends the list of required invoice details by adding one new item: the amount of CWT, if applicable, shown as a separate item. The BIR posted the regulation on its website on October 1, 2026, and one summary puts the effective date at October 16, 2026. For businesses with manual invoices, the transitory rule says unused invoices may continue to be used, as long as the phrase "Less: Withholding Tax" is conspicuously stamped on the face of each one. Newly printed invoices need to include that phrase before they're used.

The regulation doesn't create a new withholding tax or change any rates. It's about transparency: a separate line makes it easier for both buyer and seller to see and verify what was withheld.

There was one gap. One summary notes that RR 6-2026 doesn't mention computerized accounting systems, POS, or e-invoicing setups at all. That's a big deal, because most businesses today issue invoices from software, not booklets. RMC 112-2026 is where the BIR starts answering those practical questions.

What RMC 112-2026 Says

Here are the main points, one at a time.

CWT Shows Up Only When It Applies

This is the most important clarification, and it's good news. The circular makes clear that CWT must be shown as a separate item only when the particular transaction is subject to creditable withholding tax. Not every sale involves withholding, so not every invoice needs the line.

It also isn't as simple as "B2B means yes, B2C means no." What matters is whether the buyer is legally required to withhold. An ordinary retail sale to a customer who isn't a withholding agent generally has no CWT amount.

How to Show It on the Invoice

When CWT applies, the invoice shows the full sales amount and the withholding as its own line, followed by the net amount payable. The BIR allows descriptions such as "Less: Withholding Tax," "Less: Creditable Withholding Tax," or "Less: CWT."

What Not to Do With It

The circular says CWT must not be treated as a discount or deducted from gross sales, VATable sales, or the VAT base. In other words, your sales figure stays the same. The CWT is a payment arrangement, not a price reduction.

If You Still Have Old Invoice Booklets

You don't have to toss your unused manual and loose-leaf invoices. They can continue to be used until fully consumed. When a transaction is subject to CWT, you stamp, print, or legibly write the CWT description and amount on the invoice before issuing it, including the original and duplicate copies. When CWT doesn't apply, no stamp or amount is needed.

You also don't need a new Authority to Print just because your current layout lacks a CWT field. However, manual and loose-leaf invoices printed under an ATP issued after RR 6-2026 took effect must include a separate CWT line.

If You Use a POS, CRM, or Accounting Software

This is the part many readers care about most. Businesses using a computerized accounting system, POS, CRM, or other invoicing software need to make sure the system can capture and display CWT information. The CWT field becomes part of the system configuration, and when CWT doesn't apply, the field can stay blank or show "N/A" or "0.00." The system also needs to preserve the withholding information and keep an audit trail of changes.

There's a useful distinction here between limited and material system changes. A modification made solely to accommodate the CWT requirement may qualify as a limited system change, as long as it doesn't materially affect core system functions. That kind of change doesn't automatically require a new system registration, though notification or reporting requirements may still apply. Bigger changes touching things like system architecture, invoice numbering, or security may need additional BIR approval first.

If You Learn About the Withholding After the Invoice

This happens more than you'd think. A client tells you a week later that they withheld tax. Under the circular, the buyer must promptly communicate the withholding information, and the seller issues a BIR-registered credit memo that reflects the CWT and references the original invoice. The original invoice stays as is. It must not be erased, overwritten, canceled, or reused.

The Invoice Line Doesn't Replace Form 2307

Showing CWT on your invoice doesn't replace the withholding tax certificate (BIR Form 2307). That certificate is still what supports your tax credit. Think of the invoice line as a billing detail and the 2307 as the proof.

Deadlines and Transition Periods

Here's the transition schedule as described in the one detailed write-up I could find of RMC 112-2026:

A big caution: the same write-up points out an apparent inconsistency in the circular's own wording. One line refers to December 31, 2025, while the following provisions refer to January 1, 2027. The table above reflects the author's best reading, but they recommend checking the deadline against official BIR clarification. I couldn't find the official text myself, so please verify before you plan around any date.

Also, a transition period doesn't mean you can ignore the requirement in the meantime. Where CWT applies, you're expected to use the temporary method, such as stamping or writing the line, until your system is updated.

Worked Examples

Numbers make this much easier to follow. The amounts below are for illustration.

Example 1: A Service Invoice Subject to CWT

A consulting business bills a corporate client ₱100,000 for services, with 12% VAT on top. Assume the client is required to withhold 2% (the actual rate depends on the type of payment and applicable rules).

The CWT reduces what the client pays you, but it doesn't reduce your gross sales or your VATable sales.

Example 2: An Ordinary Retail Sale

A customer buys ₱2,500 of groceries for personal use. They aren't a withholding agent, so there's no CWT. The store issues a normal invoice, and if the system has a CWT field, it's left blank or marked "N/A" or "0.00."

Example 3: An Old Manual Invoice Booklet

A small shop still has a few unused booklets with no CWT line. A corporate client asks them to invoice for a bulk order and mentions they'll withhold tax. The shop stamps "Less: Withholding Tax" on the invoice, writes in the amount, and issues it. The booklet doesn't get thrown out.

Who Is Actually Affected?

Most Affected

Sellers whose customers are withholding agents, such as businesses that provide services or supply goods to larger companies, are the ones who will use this line most often.

Often Unaffected Day to Day

Typical retail and restaurant sales to walk-in customers usually don't involve CWT.

The Gray Area

Here's where it gets interesting for POS users. A restaurant that caters for corporate clients, or a shop that fills bulk orders for companies, may suddenly find itself invoicing a buyer who withholds. A friend who runs a small catering side business told me her regular counter sales never involve withholding, but her office lunch orders sometimes do, so she had to learn the difference. Whether a particular sale is subject to CWT depends on the buyer and the nature of the payment, so check with your accountant if you're unsure.

And even if CWT rarely applies to you, your system should be ready to show the field when it does.

What to Do Now: A Practical Checklist

You don't need to panic, but a little preparation goes a long way. Here's what I'd do this week:

1. Ask your POS or software provider whether your system has, or will have, a CWT field, and when the update will arrive.
2. Ask whether the update counts as a limited system change and whether any notification to the BIR is needed.
3. Review your invoice templates and leftover booklets. Know what you have and what needs a stamp.
4. Agree on a process with corporate customers so they tell you about withholding before you invoice, not after.
5. Know the credit memo process for when CWT is discovered late.
6. Keep your records together: the invoice, payment record, any credit memo, and the BIR Form 2307.
7. Train your staff on when to fill the field and when to leave it blank or marked "N/A."
8. Calendar the deadlines, and keep an eye on the e-invoicing requirements under RMC 98-2026, which retains the December 31, 2026 deadline for covered taxpayers.

It also helps to work with a BIR-accredited system that keeps up with rule changes. You can read more about BIR accreditation and follow the latest on BIR e-invoicing updates. And if you want a clearer picture of how invoices, reports, and records fit together, a solid POS software setup makes the paperwork much easier to manage.

Common Mistakes to Avoid

• Putting CWT on every invoice. It's only for transactions subject to withholding.
• Treating CWT like a discount. It doesn't reduce your sales.
• Throwing away unused invoice booklets. You can usually keep using them with the right wording.
• Assuming the invoice line replaces Form 2307. It doesn't.
• Ignoring late-discovered withholding. The fix is a credit memo, not erasing the invoice.
• Assuming your provider has already handled everything. Ask. A quick question now beats a surprise later.

What About Penalties?

Honestly, it's still unclear. RR 6-2026 reportedly sets no penalty of its own, but an invoice missing the required line may no longer meet the underlying invoicing rules, so general Tax Code invoicing penalties could apply. As of this writing, the BIR hasn't said how strictly it will enforce the new line.

The circular, as summarized, does offer some comfort. It recognizes that a seller may reasonably rely on the withholding information the buyer provides, and that leaving CWT off doesn't by itself invalidate an otherwise compliant invoice. But I wouldn't count on leniency. It's simpler to get your templates and systems ready early.

Frequently Asked Questions

What is BIR RMC No. 112-2026?

It's a BIR circular that clarifies how creditable withholding tax should be shown on sales invoices under RR 6-2026, including what wording to use, what to do with existing invoice booklets, and how computerized systems should handle the new field.

Is CWT now required on every sales invoice?

No. The line is needed only when the transaction is actually subject to creditable withholding tax.

Do I need to replace my unused invoice booklets?

Generally no. Existing unused manual and loose-leaf invoices can continue to be used until consumed, with the CWT wording and amount added when it applies.

Do I need to re-register my POS system to add a CWT field?

Not necessarily. A change made solely to implement the CWT requirement may qualify as a limited system change, though notification or reporting requirements may still apply. Check with your provider and the BIR.

What if I learn about the withholding after I've already issued the invoice?

The buyer should promptly provide the withholding information, and you issue a BIR-registered credit memo that references the original invoice. You keep the original invoice and never erase or reuse it.

Final Thoughts

RMC 112-2026 is a good example of a rule that sounds bigger than it is. The core idea is simple: when CWT applies, show it on its own line, and don't treat it as a discount. The real work is making sure your templates, booklets, and systems can handle it.

Because this circular is days old and the details are still being clarified, keep an eye on official BIR announcements. For more background on the underlying regulation, Grant Thornton Philippines has a helpful tax alert on RR 6-2026, and Aureada CPA Law Firm has a detailed breakdown of RMC 112-2026.

Here's a small challenge for this week. Pick one item from the checklist, such as asking your provider about the CWT field, and do it today.

And if you sell from a shop or counter and want to see how a compliant system handles invoices, reports, and records, book a free demo and try your own scenarios. If you're a retailer who also takes bulk orders from companies, a retail POS system is a good place to start.