Why it matters
The scheme affects records and cash as well as reporting. A subcontractor needs to connect gross invoices, deduction statements and net receipts. A business can be a subcontractor for one engagement and a contractor when it pays others. Employment status, verification and the work performed require separate consideration; a construction business label alone is not enough.
A practical example
Ignoring VAT and excluded costs, a £1,000 amount subject to a 20% deduction produces £800 in the bank and £200 deducted for HMRC. Both parts need to be accounted for. Real invoices may have costs that change the deduction base, so the illustration should not replace the rules.
A common misunderstanding
CIS deductions do not guarantee a refund and are not normally a separate operating expense. The final tax position and claim process depend on the business structure and full circumstances. Keep the statements as evidence rather than relying on bank totals.
Sources & further reading
General information for UK readers, updated 3 November 2026. Examples are illustrative. Tax treatment depends on the facts and current rules; seek advice before making a decision.