Cost of Construction Industry Scheme (CIS)
across the UK

# Construction Industry Scheme (CIS) Accreditation Guide

The Construction Industry Scheme is regulated by HMRC, making it a statutory rather than voluntary accreditation system. However, reputable CIS service providers typically hold memberships or recognitions from trade bodies such as the Chartered Institute of Taxation (CIOT), the Association of Accounting Technicians (AAT), or the Federation of Small Businesses (FSB). Some may also be registered as tax agents with HMRC or hold professional memberships from bodies like the Institute of Chartered Accountants in England and Wales (ICAEW). These credentials signal that a provider understands CIS obligations, including the monthly return requirements, subcontractor verification, and payment processing. While HMRC does not formally "accredit" CIS service providers in the way some industries are regulated, it does maintain records of registered tax agents and agents who have undertaken specialist compliance training, giving you a way to check the legitimacy of your chosen provider.

To verify a provider's credentials, start by checking their website for professional memberships or qualifications, then cross-reference these through the relevant body's official register. CIOT and ICAEW maintain searchable registers of members, as does AAT, allowing you to confirm both membership and any disciplinary history. You can also contact HMRC's online services team or check whether the provider is listed as an approved agent for CIS administration. Why this matters is straightforward: an unaccredited or inexperienced provider may make costly errors in how they classify workers, calculate deductions, or submit returns, exposing you to HMRC penalties and interest charges. A accredited provider brings professional indemnity insurance, ongoing training obligations, and a reputation at stake, all of which protect your business from compliance failures.

Accredited CIS service providers typically charge between 15% and