Guides
CIS guides, in plain English
Short guides that answer what contractors and labour providers ask about CIS. Every rule is linked to the GOV.UK or HMRC page it comes from.
- CIS changes April 2026: the new fraud rulesWhat changed on 6 April 2026, and what "knew or should have known" means.
- How to verify a subcontractor with HMRCWhen you must verify, what you need, and the reference to keep.
- Gross payment status: the tests, and how you can lose itThe tests, the annual review and the new 5 year cancellation.
- CIS supply chain due diligenceThe test in HMRC's words, the signs it names, and what to record.
- Check a company before paying a subcontractorWhat the Companies House register shows, and what it cannot.
- How to check a subcontractor's CIS statusVerify with HMRC, check the company, keep a dated record.
- CIS checks for labour providersThe rules look at the money you are paid as well as the money you pay.
CIS checks across the UK
CIS covers construction work carried out anywhere in the UK, so the checks are the same wherever you build. See the construction picture, the labour supply and the major projects in 12 UK cities.
Run the free checks. The company check reads the Companies House register for one company, and the self-check asks 15 quick questions about who you pay and how you check them. No signup.