What a CIS deduction check involves in the UK

Tax obligation explained

The Construction Industry Scheme (CIS) requires contractors to deduct money from subcontractors' payments and send these deductions to HMRC as advance payments towards the subcontractor’s tax and National Insurance. A CIS deduction check involves reviewing the contractor’s records, payment statements, and HMRC’s CIS online service to confirm that deductions match the amounts paid and reported. This process helps subcontractors ensure they are not overcharged and contractors avoid penalties for incorrect deductions.

Key legal requirements

• Verify contractor’s CIS registration status via HMRC’s online service
• Cross-check payment statements against actual payments made to the subcontractor
• Confirm deducted amounts match HMRC’s reported figures in the contractor’s CIS return
• Ensure contractor has issued a valid CIS payment and deduction statement to the subcontractor
• Review any discrepancies with the contractor and HMRC if deductions appear incorrect

Why this matters

Incorrect CIS deductions can lead to financial losses for subcontractors or legal liabilities for contractors if HMRC identifies non-compliance. Subcontractors may face difficulties reclaiming overpaid tax, while contractors risk penalties for failing to withhold or report deductions accurately. Regular checks help maintain transparency and compliance with HMRC’s CIS rules.

Next step with VetroCheck

Use the CIS Deductions agent if you want a structured review of the relevant documents and supporting record.

Related reading

• Capital Gains Property Check (UK)
• CIS Deductions Check (UK)

Compliance note

This glossary content is provided for informational and educational purposes only. It does not constitute formal legal advice, does not create a solicitor-client relationship, and should be checked against current legislation, official guidance, and the facts of the specific case.