ISO 9001:2026 was published on 16 September 2026, and on the same day Global ACI — the body that replaced the IAF and ILAC at the start of 2026 — published the binding transition requirements. Certified organisations have until 30 September 2029 to move from ISO 9001:2015 to the new edition; after that, ISO 9001:2015 certificates are no longer valid. This article explains how the clock works, when your own audit actually changes, and how to plan the three years so the deadline never becomes a problem.
How does an ISO transition period work?
A new edition of a management-system standard does not invalidate the old one overnight. The international accreditation framework sets a transition period, and for this revision it is three years from publication. During that window both editions are valid, and every certified organisation is expected to move across before it closes.
The move happens through your certification body. Your auditor assesses you against the 2026 edition at a scheduled surveillance or recertification audit — or at a separate transition audit, if the timing suits you better — once your certification body is itself accredited to certify to the new edition.
The four official dates
The requirements document (Global ACI-TECH-3-TR 2029-09-30) sets the timetable:
- 31 March 2027 — accreditation bodies must be ready to assess certification bodies against ISO 9001:2026.
- 30 June and 30 September 2027 — certification bodies submit their transition declarations by 30 June 2027, and accreditation bodies complete their decisions by 30 September 2027.
- 31 March 2028 — from this date, new and initial accredited certifications can only be issued to ISO 9001:2026.
- 30 September 2029 — the window closes. Every transition must be complete, including the issue of the new certificate.
When will my audit actually switch to 2026?
At the first scheduled audit after two things are true: your certification body is accredited to certify to ISO 9001:2026, and you have updated your system to match it. For most organisations that means a transition assessed during a routine surveillance or recertification visit. Whether the transition needs extra audit time is your certification body's decision, so ask when you book.
The practical implication: look at your audit calendar now. Because the new certificate has to be issued by 30 September 2029 — not just audited — your real deadline is the last audit comfortably before that date, with time left to close any findings. Aim for the audit before that one, and keep the last as a buffer.
What if we are certifying for the first time?
Build to ISO 9001:2026 from the start. A 2015 certificate issued now would have to transition within three years anyway, and from 31 March 2028 an accredited 2015 certificate cannot be issued at all. Until your certification body's accreditation covers the 2026 edition, it can only certify you to 2015 — so agree the timing with them before you fix a date.
What about ISO 14001?
ISO 14001:2026 has its own clock, and it runs out first: its transition closes on 30 April 2029, and new certifications have been 2026-only from 31 October 2027. If you run an integrated system and want one combined transition audit, 30 April 2029 is the date you are really working to.
What happens if we miss the deadline?
If the window closes and you are still certified only to 2015, your certificate is no longer valid. Reinstating certified status then usually means a full recertification — effectively starting the certification cycle again, rather than a light transition assessment. For a supplier whose customers, tenders or regulators require a current ISO 9001 certificate, a lapse can mean lost qualification and lost business while you recover it. It is far cheaper to transition during a normal audit than to recertify from scratch.
A realistic plan for the three years
You do not need three years of work — you need to place a modest amount of work inside the three years, early enough to avoid the rush.
- Now. Buy the published standard and run a gap assessment against it. Make sure a documented climate-change assessment is in your context (clause 4.1) — it has been mandatory since the 2024 amendment. The free clause-by-clause comparison is a quick way to size the gap, and the transition deadline calculator shows which audit should carry the transition.
- Year 1 (to September 2027). Update your documents for the change areas — culture and ethics, the risk and opportunity split (clause 6.1), planning of changes and awareness — and read the new Annex A. Add ethics to induction and awareness training. Ask your certification body when its accreditation for 2026 will be in place.
- Year 2. Internal-audit your system against the 2026 edition (clause 9.2), take the results through a management review (clause 9.3), and close any gaps. Aim to transition at a surveillance audit in this window.
- Year 3 — buffer, not deadline. Keep the final year as contingency. Do not plan to transition at the very last audit before the deadline.
Don't wait for the last minute
Certification bodies get booked up as the deadline approaches, and audit slots become scarce. Organisations that leave the transition to the final months risk not getting an audit date in time — and a missed date means a lapsed certificate. The cheapest, calmest path is to transition at a normal surveillance audit in year two.
If you would like your transition planned properly — with a clause-by-clause gap checklist and a phased action plan you can map to your own audit calendar — the ISO 9001:2026 Transition Toolkit gives you the working documents.
Sources: Global ACI, "Global ACI Publishes Transition Requirements for ISO 9001:2026" (16 September 2026) and Global ACI-TECH-3-TR 2029-09-30 (M); Global ACI's transition requirements for ISO 14001:2026. Updated 23 September 2026 with the confirmed dates — earlier versions of this article gave the anticipated pattern.