ISO 9001:2026 Transition Plan: First 90 Days

ISO 9001:2026 published on 16 September 2026. UKAS's technical bulletin confirms it: "ISO 9001:2026 was published on 16 September 2026 and replaces ISO 9001:2015 + Amendment 1:2024 over a defined transition period." If you hold an ISO 9001:2015 certificate, the practical answer is that nothing is required of you in the first 90 days, and the useful work in that window is preparation rather than transition. Your certification body cannot issue an accredited 2026 certificate until its own accreditation is extended, and UKAS transition decisions do not commence until 1 January 2027. This guide sets out what actually happens in what order, and what is worth doing while you wait.

What is confirmed

The transition arrangements were published on the same day as the standard, so the hedging that surrounded this revision for the past year is over.

Confirmed	Source
ISO 9001:2026 published 16 September 2026	UKAS technical bulletin
Certified organisations must transition by 30 September 2029	Global ACI-TECH-3-TR 2029-09-30 (M)
UKAS transition decisions commence 1 January 2027	UKAS technical bulletin
UK certification bodies stop accepting new applications against the 2015 edition on 16 March 2028	UKAS technical bulletin

The transition period is not set by ISO. It is set by the international accreditation body and applied by national accreditation bodies — in the UK, UKAS. That international role sat with the International Accreditation Forum until IAF ceased operations on 1 January 2026, the same date Global Accreditation Cooperation Incorporated (Global ACI) commenced full operations. Global ACI has assumed the former roles of IAF and ILAC.

Global ACI published the ISO 9001:2026 transition requirements on 16 September 2026 as Global ACI-TECH-3-TR 2029-09-30 (M). It states that it "has established a three-year transition period" and that "Organisations already certified to ISO 9001:2015 will have until 30 September 2029 to complete their transition." That is now a date you can put in a board paper. These requirements "are mandatory for Global ACI Multilateral Recognition Arrangement (MRA) accreditation body signatories and their accredited certification bodies operating within the applicable scope" — UKAS among them.

Usefully for budgeting, Global ACI also confirms the transition "may take place during a scheduled surveillance or recertification audit, or through a separate transition audit." You do not automatically need to buy an extra audit.

Why nothing happens on 17 September

A certification body cannot issue an accredited certificate against a standard it is not accredited for. Now that the standard has published, every UKAS-accredited certification body has to demonstrate its own competence against the new edition before it can audit anyone to it.

UKAS published its own ISO 9001:2026 timeline on publication day:

Milestone (ISO 9001:2026)	Date
Publication of ISO 9001:2026 and UKAS acceptance of self-declarations and evidence	16 September 2026
UKAS ready to begin transition assessment activity	1 December 2026
Transition decisions commence	1 January 2027
All UKAS transition decisions to be completed	30 September 2027
CABs to stop accepting new applications against the previous version of the standard	16 March 2028
CABs to transition all certified customers to the revised standard	30 September 2029

Internationally, Global ACI requires accreditation bodies to be ready "no later than 31 March 2027", certification bodies to submit their transition declaration and supporting information "by 30 June 2027", and adds that "From 31 March 2028, new and initial accredited certifications may only be issued to ISO 9001:2026."

UKAS is explicit about what happens if a body jumps the gun: "Until UKAS has made an accreditation decision to transition, certification issued against ISO 9001:2026 must not be represented as accredited certification."

Read that carefully, because it is the single most useful thing in this guide. If a certification body offers you an ISO 9001:2026 certificate before its accreditation decision comes through, the certificate is unaccredited. For most UK businesses an unaccredited certificate is worthless — it will not satisfy a public-sector procurement requirement or a customer's supplier-approval process, which is usually the reason you hold the certificate at all.

The practical read: publication in September 2026, the first accredited 2026 audits from January 2027, and a deadline three years out. Your certificate is safe in the meantime.

Your first 90 days: what is actually worth doing

Working back from that shape, here is where the effort pays.

Days 1–30: find out what changed, not what you fear changed

The clause structure is where the work is. Requirements that are substantively similar can still sit under different numbers, and every internal reference in your quality manual, procedures and audit checklists points at a clause number.

Map your existing documented information against the new structure. Our ISO 9001:2026 vs 2015 clause-by-clause comparison sets out what moved where, and the free clause comparison tool does the mapping interactively.
List every document that cites a clause number. For a typical 5–100 person QMS that is the quality manual, six to ten procedures, the internal audit checklist and the management review agenda.
Do not rewrite anything yet. You are building an inventory, not editing.

Days 31–60: talk to your certification body before everyone else does

Transition periods create bottlenecks, and the businesses that book early get the slots they want.

Ask your certification body three specific questions: when it expects its UKAS accreditation decision, whether it will run transition assessments alongside your scheduled surveillance audit or as a standalone visit, and what it will charge for the difference. The answers vary more than you would expect.
If you are unhappy with your current body, this is the natural moment to move. There is a separate guide on choosing an ISO 9001 certification body covering what to compare — but note that changing body during a transition adds work, so decide on merit rather than on price alone.
Get the transition cost into next year's budget. A companion guide on what the ISO 9001:2026 transition will cost breaks down where the money actually goes.

Days 61–90: run a gap analysis against the new edition

This is the part that shortens your transition audit, and it is entirely within your control.

Run a documented gap analysis against the 2026 structure. The method is the same one you would use for first-time certification — see the ISO 9001 gap analysis checklist — but the input is your existing QMS rather than a blank sheet.
Record the output as a dated gap register with an owner and a target date per gap. Your auditor will ask to see evidence that the transition was planned, not improvised.
Schedule one internal audit against the new edition before your transition audit. Auditing against a standard for the first time in front of an external auditor is a bad plan.

What not to do in the first 90 days

Do not rewrite your quality manual from pre-publication commentary. The standard is now published, and publication is the point at which clause numbering is final — UKAS confirms the revision involves "restructuring of clauses". Buy the standard and work from the real text, not from a summary written before it existed.
Do not accept a 2026 certificate before your body's accreditation decision. See the UKAS wording above.
Do not delay a first-time certification you actually need. If a customer contract requires ISO 9001 this year, certify to the 2015 edition now. Certificates issued to the outgoing edition remain valid through the transition period, and the transition itself is a smaller job than a first certification. The ISO 9001 certification timeline covers realistic lead times.
Do not book transition training for the whole team yet. One person needs to understand the new structure in detail during this window. Everyone else needs it when the procedures actually change.

What is still open

The two big unknowns that hung over this transition — the deadline and the UK bulletin — were both closed on 16 September 2026. Two things remain genuinely open:

When your specific certification body will be accredited. UKAS transition decisions commence 1 January 2027 and are all to be completed by 30 September 2027. Bodies are assessed individually, so yours may be early or late in that window. Ask them directly — it is the single most useful question you can put to them right now.
What the published text actually says, clause by clause. ISO 9001:2026 is a paywalled document. UKAS tells us the clauses have been restructured and that the most significant changes "relate to interested parties, quality culture and ethical behaviour, risks and opportunities, planning of changes and management review", but the detail is in the standard itself. Buy a copy before you commit to a documentation plan.

Practical takeaway checklist

Inventory every QMS document that cites a clause number
Map your current documented information to the 2026 structure
Ask your certification body when it expects its UKAS accreditation decision
Confirm whether your transition assessment runs with surveillance or standalone, and what it costs
Budget the transition in the next financial year
Run a documented gap analysis against the new edition
Keep a dated gap register with owners and target dates
Schedule one internal audit against the new edition before the transition audit
Do not accept an unaccredited 2026 certificate
Re-check the Global ACI and UKAS positions before you book your transition audit

If you are mapping documentation to the new clause structure, the free ISO 9001:2026 clause comparison tool gives you a starting shape for what moved — but its clause numbering is drawn from pre-publication commentary and has not been checked against the published standard, which UKAS confirms restructured the clauses. Treat it as a prompt for questions, and verify against your own copy.

This article is for general informational purposes only and does not constitute legal, regulatory, or professional compliance advice. ISO 9001 is a voluntary standard, not a legal requirement — losing certification is a commercial consequence, not a regulatory one. Transition arrangements are set by Global ACI (which assumed the former roles of IAF and ILAC on 1 January 2026) and applied by UKAS; the dates above are quoted from Global ACI-TECH-3-TR 2029-09-30 (M) and UKAS's ISO 9001:2026 technical bulletin, both published 16 September 2026. The text of ISO 9001:2026 itself is a purchased standard and is not reproduced here. Always verify requirements with your UKAS-accredited certification body before making compliance decisions.