Estimate CIS deduction before you invoice.
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The UK CIS deduction calculator answers a narrow question: how much might a contractor withhold from qualifying labour on this payment? Enter gross labour, choose 20% or 30% based on verification, and see deduction and net instantly—no account, no server round trip.
It ignores materials, VAT, and gross payment status nuances that still belong on your invoice. Use it at quote stage so cash flow is not surprised when £2,000.00 labour becomes £1,600.00 net at 20%.
At 20% on £5,000.00 labour, CIS is £1,000.00 and net received is £4,000.00. At 30% on the same labour, deduction rises to £1,500.00 and net falls to £3,500.00—a £500.00 swing that belongs in your tender margin.
For mixed payments, run labour-only amounts. If a £7,000.00 invoice includes £2,000.00 materials, calculate CIS on £5,000.00 only, yielding £1,000.00 or £1,500.00 withheld depending on status.
HMRC examples often floor deductions to whole pounds in published scenarios. Our module documents rounding in config metadata; if your contractor software differs by a few pence, follow their statement as the legal record.
Verification can change mid-year after HMRC correspondence. Recalculate when you receive a new status letter, not only at April.
Bookmark this calculator next to the CIS invoice tool. Numbers you test here should match the labour line on the invoice and the deduction on the payment statement for the same job reference.
Prefill from related tools when URLs carry encoded labour totals—still revalidate before sending to site.
Results are educational, not a tax return or appeal document. Employment status disputes, deemed contractor rules, and multi-site aggregations need professional advice.
Link to GOV.UK from the official sources list when training new apprentices on their first subcontract.
Document contents stay in your browser for PDF generation. We do not receive your payslip, invoice, or counterparty details in v1.
No. This is an unofficial template for your records. Always confirm requirements with your regulator or adviser.
Calculators focus on on-screen results. Some may offer a summary card PDF; check the Download button — if disabled, use Export JSON or screenshot for your records.
Last reviewed 2026-10-24. Templates are unofficial—not tax or legal advice.
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