BIR Waiver of the Statute of Limitations to Assess: Getting It Right Under RMO No. 14-2016

A BIR Waiver of the Statute of Limitations is a written agreement, signed before the ordinary three-year assessment deadline expires, that extends how long the Bureau of Internal Revenue has to issue a deficiency tax assessment. Revenue Memorandum Order (RMO) No. 14-2016, issued April 18, 2016, relaxed the strict formalities that used to govern these waivers — but a waiver still has to contain the right elements, signed by the right person, or it risks being struck down as defective, the way it was in CIR v. Telstar Manufacturing.

This post is a practical companion to that case: what a waiver needs today to hold up, not just what went wrong there. For the audit process a waiver typically comes up in, see BIR Letter of Authority: Your Rights During a Tax Audit and BIR Form PAN vs FAN: The Assessment Process Explained.

Why a waiver exists in the first place #

The BIR does not have unlimited time to assess a deficiency tax — Section 203 of the National Internal Revenue Code (NIRC) generally gives it three years, counted from the deadline to file the return (or the actual filing date, if filed late). When an audit runs long — more documents to review, more issues to resolve — that three-year clock can run out before the BIR finishes. Section 222 of the NIRC lets the taxpayer and the Commissioner agree, in writing, to push that deadline back instead of forcing the BIR to assess prematurely or let the matter prescribe. Section 222(b) of the NIRC provides:

“If before the expiration of the time prescribed in Section 203 for the assessment of the tax, both the Commissioner and the taxpayer have agreed in writing to its assessment after such time, the tax may be assessed within the period agreed upon.”

That written agreement is the waiver. It only works if signed before the original three-year deadline lapses — a waiver signed after prescription has already set in cannot revive a dead assessment period.

What RMO No. 14-2016 changed #

RMO No. 14-2016, per multiple secondary sources summarizing the order, is titled “Guidelines for the Execution of Waivers from the Defense of Prescription Pursuant to Section 222 of the National Internal Revenue Code (NIRC) of 1997, as amended,” and it simplified requirements that had made waivers a frequent point of litigation. Before 2016, waivers followed RMO No. 20-90 and RDAO No. 05-01, which imposed a rigid checklist — notarization, a recorded BIR acceptance date, a specific tax type and amount, and a mandatory template form. RMO No. 14-2016 dropped several of those requirements, on the reasoning that the taxpayer, not just the BIR, should be able to rely on a simpler and clearer process.

This table reflects the changes as consistently reported across secondary sources (including law-firm and audit-firm commentary); the current, authoritative text of RMO No. 14-2016 is on the BIR website.

What a valid waiver still needs today #

Even with the relaxed rules, a waiver executed under RMO No. 14-2016 is not a blank check — it still has to identify the taxpayer, state two specific dates, and be signed by someone with actual authority to bind the taxpayer. Skipping any of these does not automatically void the waiver the way missing notarization once did, but it removes the paper trail the BIR and the taxpayer both need if the waiver’s validity is later challenged.

A waiver executed today should contain:

1. Taxpayer identification — legal name and Taxpayer Identification Number (TIN).
2. Date of execution — the date the taxpayer or authorized representative signed, which must fall before the original Section 203 deadline expires.
3. Expiry date — the specific date the extended assessment period ends.
4. Signature of the taxpayer or a responsible official — for a corporation, this can be any responsible official, not necessarily the person who signed the original tax return, or a duly authorized representative acting under a board resolution or secretary’s certificate.
5. Acceptance by an authorized BIR official — signed on behalf of the Bureau, though the specific acceptance date no longer needs to appear on the document itself.

What happens when a waiver is defective anyway #

A waiver that is missing required elements, or signed by someone without proper authority, can still be struck down as defective — and a defective waiver generally does not extend the BIR’s assessment period at all. That distinction matters because if the waiver never validly extended the deadline, any assessment the BIR issues after the original three-year period under Section 203 is void for having been issued out of time, regardless of what the waiver document says or what later date it claims to extend to.

CIR v. Telstar Manufacturing is a real-world illustration of exactly this outcome, though it was decided under the older, stricter RMO No. 20-90 framework rather than RMO No. 14-2016: the Supreme Court found Telstar’s waivers were executed for the wrong purpose, failed to specify the tax and amount involved, and were accepted by an official who lacked authority to sign for an assessment of that size. Because the waivers were void, they never extended the BIR’s deadline, and the resulting assessment was cancelled as time-barred. RMO No. 14-2016 removes several of the specific defects that sank Telstar’s waivers — notarization and itemized tax amounts, for instance, are no longer required — but the underlying principle carries forward: an authority defect (the wrong signatory) or a missing execution or expiry date can still be fatal, even under the simpler post-2016 rules.

Practical checklist before signing a waiver #

A taxpayer asked to sign a waiver during a BIR audit should treat it as a negotiated document, not a formality to sign and forget — confirming a short list of items before signing protects the taxpayer’s own prescription defense later. Before signing, confirm:

• The waiver is signed before the original three-year deadline under Section 203 expires — not after.
• The person signing on the taxpayer’s side has actual authority to do so (a board resolution or secretary’s certificate for a corporate signatory is good practice, even though notarization itself is no longer mandatory).
• The execution date and expiry date are both clearly and correctly stated.
• A copy of the signed waiver is kept on file, together with any authorization document for the signatory.
• The expiry date agreed to is reasonable relative to the audit’s actual remaining scope — a waiver is a negotiation, not an obligation to grant whatever extension the BIR requests.

Frequently asked questions #

What is a BIR Waiver of the Statute of Limitations? #

It is a written agreement between a taxpayer and the Commissioner of Internal Revenue, signed before the ordinary three-year assessment period under Section 203 of the NIRC expires, extending the deadline by which the BIR may issue a deficiency tax assessment to a later date the two parties agree on under Section 222(b).

Does a BIR waiver still need to be notarized under RMO No. 14-2016? #

No. Per multiple secondary sources summarizing RMO No. 14-2016, notarization is no longer a validity requirement for a waiver, which was a mandatory element under the earlier RMO No. 20-90 and RDAO No. 05-01 framework.

What two dates must a valid waiver show? #

A valid waiver must show the date the taxpayer or authorized representative executed it, and the expiry date of the extended assessment period the taxpayer and BIR agreed on. The waiver no longer needs to record the BIR’s acceptance date or show both parties signing on the same day.

Can a waiver cover all taxes for a period instead of listing specific tax types and amounts? #

Yes. Under RMO No. 14-2016, a waiver may simply state that it covers all internal revenue taxes for the relevant period, rather than itemizing specific tax types and exact amounts due, which the older rules required.

What happens if a BIR waiver is defective? #

A defective waiver generally does not extend the BIR’s assessment period, meaning any assessment issued after the original three-year deadline under Section 203 can be void for having been issued out of time. CIR v. Telstar Manufacturing is an example of the Supreme Court cancelling an assessment on exactly this ground.

Summary #

RMO No. 14-2016 simplified what a BIR Waiver of the Statute of Limitations needs to be valid — dropping mandatory notarization, the BIR’s acceptance date, same-day signing, and itemized tax amounts that the older RMO No. 20-90 and RDAO No. 05-01 framework required. What still matters is taxpayer identification, a correct execution date before the original Section 203 deadline, a clear expiry date, and a signature from someone with actual authority to bind the taxpayer. Getting any of these wrong can still leave a waiver defective — and, as CIR v. Telstar Manufacturing shows, a defective waiver means the BIR’s original three-year deadline never moved, so any assessment issued after it is void regardless of the waiver’s stated expiry date. For the surrounding audit process, see BIR Letter of Authority: Your Rights During a Tax Audit and BIR Form PAN vs FAN: The Assessment Process Explained. Always confirm current requirements against the full text of RMO No. 14-2016 on the BIR website before relying on a waiver in an active audit.