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Are you a third-party provider planning on carrying out identity verification checks for Companies House on behalf of your clients? Registration to be an authorised company service provider (ACSP) opened on 18 March 2025 and firms can now voluntarily verify the identity of clients. The mandatory verification requirement will take effect in autumn 2025.

How to find your AML registration number

When you register you will be asked for your AML membership number or ID – this is your ICAEW firm number starting C0 or A0. Entering this number will allow Companies House to check that you are supervised for anti-money laundering in the UK.

Key information for ACSP registration

  • The information held on ICAEW’s records, such as your business name and address, must match the details you provide to Companies House, otherwise your application will be rejected. If you need to update your record with ICAEW, you can find out more about how to do so on our maintaining your firm record page.
  • Identity verification checks by ACSPs must meet the same level of assurance as those who verify directly with Companies House. You will need to allow additional time to carry out these checks when providing services such as company formation to company clients.

Guidance for ACSPs around identity verification requirements will be published by Companies House in due course.

Access our latest video resources

Watch our newest AMLbites to learn about authorised corporate service providers and the future verification of directors and persons of significant control. Register for our 11 June webinar on understanding ACSP registration and compliance.

Watch AMLbitesRegister for our webinar