UK REACH transitional registration deadlines confirmed for 2029–2031

UK REACH transitional registration deadlines confirmed for 2029–2031

Businesses manufacturing or importing chemical substances in Great Britain now have greater certainty over the timetable for completing UK REACH transitional registrations.

The REACH (Amendment) (No. 2) Regulations 2026 were made on 16 July 2026 and will come into force on 6 August 2026. They extend the three transitional registration deadlines from 27 October 2026, 2028 and 2030 to:

• 27 October 2029
• 27 October 2030
• 27 October 2031

The deadline applying to each substance will continue to depend on its tonnage and hazard profile. The Regulations also amend the periods within which the Health and Safety Executive must complete compliance checks on specified proportions of registration dossiers.

The extension provides additional preparation time, but it does not remove the underlying registration obligations. Businesses relying on grandfathered registrations, Downstream User Import Notifications (DUINs) or deferred information submission under the New Registration of an Existing Substance (NRES) process should review their portfolios and confirm the deadline applying to each substance.

The Regulations do not implement the Alternative Transitional Registration model (ATRm). Further legislation will be required to establish the final information requirements under that model.

What has changed?

The Regulations amend Article 127P of UK REACH, which determines the relevant periods for completing transitional registrations.

The amendment also changes the Candidate List reference periods used to determine whether the first or second deadline applies. Businesses should therefore avoid relying solely on assessments completed against the previous timetable and should check each substance against the amended Article 127P criteria.

The one-year intervals between the new deadlines are narrower than the previous two-year intervals. Organisations managing large portfolios may therefore have more preparation time overall but a more concentrated period for completing registrations between 2029 and 2031.

Which businesses are affected?

The extended deadlines principally affect transitional registrations for substances already present on the GB market following the end of the EU exit transition period.

Grandfathered registrations

Relevant EU REACH registrations held by GB-based legal entities were recognised under UK REACH through the grandfathering provisions. Registrants were required to provide initial information to HSE, with the remaining information due by the applicable transitional deadline.

HSE has updated its guidance to reflect the new dates of 27 October 2029, 2030 and 2031. Grandfathered registrants that continue to manufacture or import at one tonne or more per year should confirm that the initial information has been submitted and identify what remains outstanding.

Downstream User Import Notifications

The DUIN provisions allow qualifying GB businesses that previously imported from the EU as downstream users or distributors to defer registration.

A DUIN is not itself a registration. A business wishing to continue importing the substance after the relevant extended deadline must submit a UK REACH registration for that substance. HSE confirms that the deadline will be 27 October 2029, 2030 or 2031, depending on tonnage and hazard profile.

Businesses should also check that their notification covers the relevant legal entity, substances and supply arrangements. Changes to suppliers, sourcing routes or corporate structures may affect whether the original transitional conditions continue to apply.

New Registration of an Existing Substance

A business beginning to manufacture or import in Great Britain a substance that was previously registered under EU REACH may, following an Article 26 inquiry, be permitted to defer part of the full information requirement. This is commonly described as a New Registration of an Existing Substance, or NRES.

Companies using this route should not treat an NRES submission as completion of the registration process. Where full information has been deferred, the outstanding dossier information must still be supplied by the relevant extended deadline.

Eligibility should be considered substance by substance. HSE states that where the relevant substance was not previously registered under EU REACH, or where transitional arrangements do not apply, a complete UK REACH registration is generally required before manufacture or import reaches one tonne per year.

What has not changed?

The Regulations change the timetable; they do not remove the UK REACH registration requirement.

GB-based manufacturers and importers remain responsible for determining whether substances manufactured or imported at one tonne or more per year require registration. Registration applies to substances on their own, substances contained in mixtures and, in limited circumstances, substances in articles. It is assessed per substance and per legal entity.

The amendment also does not create a general transitional arrangement for new substances. Businesses introducing a substance that is not eligible for grandfathering, DUIN or an NRES deferral may need to complete registration before manufacture or import begins at the relevant threshold.

UK REACH applies in England, Scotland and Wales. EU REACH continues to apply in Northern Ireland under the Windsor Framework, meaning that businesses operating across the UK may need to manage both regulatory regimes.

Why have the deadlines been extended?

The deadlines have been extended to provide time for the government to finalise and legislate for the Alternative Transitional Registration model and to allow businesses an implementation period before the first submission deadline.

The ATRm is intended to reduce the cost and duplication associated with registering substances that were already registered under EU REACH, while retaining the UK REACH principle of “no data, no market”.

The government’s March 2026 response indicates that the future model is expected to include:

• submission of hazard conclusions rather than a duplicate set of all underlying EU hazard studies;
• use and exposure information in line with existing UK REACH requirements;
• revised arrangements for chemical safety assessments and chemical safety reports; and
• substance groups to support agreement on hazard conclusions, data sharing and joint submissions.

These statements establish the policy direction, but they are not yet the final legal requirements. Separate legislation and supporting guidance will be needed before businesses can determine precisely what information must be submitted.

Changes to HSE compliance-check periods

The Regulations also extend the periods for HSE to conduct compliance checks on minimum percentages of specified registration dossiers.

The relevant dates in Article 41(5) are moved:

• from 2027 to 2030;
• from 2030 to 2032; and
• from 2035 to 2036.

This is intended to align regulatory scrutiny with the revised submission timetable, so that HSE’s statutory compliance-check periods follow receipt of the relevant registration information.

These dates relate to HSE’s compliance-check programme and should not be confused with the deadlines by which individual businesses must submit their information.

What does this mean for businesses?

The extension reduces the immediate pressure created by the previous October 2026 deadline, but it should not be seen as a reason to suspend preparation.

The final ATRm requirements are not yet in force, but businesses can already address several questions that will be central to their future compliance:

• Which legal entities manufacture or import each substance into Great Britain?
• Which substances reach the one-tonne registration threshold?
• Is the business relying on grandfathering, a DUIN, an NRES arrangement or a full new registration?
• Which of the three deadlines is likely to apply based on tonnage and hazard profile?
• Has the required initial notification or registration information been submitted?
• Are substance identity, supply-chain and tonnage records complete and current?
• Will suppliers continue supporting the GB market?
• Which internal resources, budgets and external support may be needed between 2027 and 2031?

For businesses with extensive portfolios, early prioritisation will be important. The more compressed sequence of deadlines may create resource constraints if most assessment and dossier work is deferred until the final years.

What should businesses do now?

A proportionate preparation programme could include four stages.

1. Confirm the regulatory position – Map each substance against the relevant GB legal entity, annual tonnage, hazard profile and supply-chain role. Confirm whether the substance is covered by grandfathering, a DUIN, NRES or another registration route.
2. Review existing submissions – Check information already submitted through the Comply with UK REACH service and identify gaps, inconsistencies or changes in legal entity, supplier, substance identity or tonnage.
3. Prioritise the portfolio – Group substances by likely deadline, commercial importance, data availability and supply-chain risk. Particular attention may be needed for substances essential to high-value products or supplied by organisations reconsidering their participation in the GB market.
4. Monitor the ATRm legislation – The extended dates are now confirmed, but the information requirements are not. Businesses should monitor the forthcoming legislation and guidance and be ready to revise their plans when the final model is established.

What happens next?

The Regulations will come into force on 6 August 2026, giving legal effect to the extended timetable.

The next significant stage will be the legislation implementing the ATRm. The government has stated that it will bring forward legislation in time for industry to meet the updated registration deadlines, but the final technical requirements and implementation arrangements remain to be confirmed.

Businesses should therefore plan against the confirmed 2029–2031 timetable while retaining sufficient flexibility to respond to the final registration model.

How RPA can help

RPA supports manufacturers, importers, downstream users, Only Representatives and trade associations in understanding and managing UK REACH requirements.

Relevant support includes:

• substance and portfolio reviews;
• assessment of UK REACH registration obligations;
• grandfathering, DUIN and NRES strategy;
• Only Representative and GB market-access advice;
• registration planning and evidence review;
• supply-chain analysis; and
• monitoring and interpretation of the forthcoming ATRm requirements.

RPA combines scientific, regulatory, economic and policy expertise to help organisations develop proportionate strategies based on their products, legal roles and commercial priorities.