CIS Refund Calculator 2026/27

Contractors take 20% or 30% off your labour all year. If that's more than your actual tax and National Insurance bill, HMRC owe you the difference.

Your year

Annual CIS suffered £Annual turnover (excl VAT) £Materials you paid for £Other expenses (fuel, tools, insurance) £Student loan plan

Your position

Estimated refund

£1,868

CIS suffered £9,000 − tax bill £7,132

Taxable profit: £40,000
Income tax: £5,486
Class 4 NI: £1,646
Total tax bill: £7,132
CIS already paid: £9,000

File your Self Assessment early after 6 April — HMRC usually repay CIS refunds within a few weeks.

Want to stop lending HMRC your money?

With Gross Payment Status you keep 100% of every invoice. Check if you qualify, or run a single invoice through the main CIS calculator.

Estimate only, not financial advice. CIS rates: 20% registered, 30% unregistered, 0% Gross Status. Personal allowance £12,570. Based on HMRC rules 2026/27. Check with your accountant.