Calculator

CIS tax refund estimator

Estimate whether you're due a refund on the tax your contractors deducted this year — or whether your deductions fall short of what you'll actually owe.

CIS income this tax year (gross, before deductions)

Materials cost included in your invoices

Other allowable business expenses

Other taxable income this year (optional)

Where do you live?

Tax year

CIS tax already deducted (from your CIS statements)

Estimated automatically as 20% of your income after materials (£30,000). Enter your actual figure from your CIS statements for an accurate result.

£26,500

Taxable profit (£32,000 income − £2,000 materials − £3,500 expenses).

£3,622

Estimated Income Tax + Class 4 NI due on your CIS profit.

£6,000

CIS tax deducted by contractors this year.

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Estimated refund: £2,378

Your CIS deductions look higher than your actual tax and Class 4 NI liability — you may be due money back after filing your Self Assessment return.

CIS refunds are only paid out once your Self Assessment return is filed and HMRC has processed it — usually a few weeks after filing, sooner if you file early in the tax year. Most subcontractors who are due a refund file as soon as possible after 6 April rather than waiting until January.

Want us to actually file it and get your refund moving?

We handle CIS returns, refund claims, and monthly submissions so nothing gets missed. Free initial review.

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Estimates only. Assumes standard Personal Allowance, no other CIS-specific reliefs, and no Payments on Account already made. Class 2 NI was abolished from April 2024. Always confirm your position with a qualified accountant before relying on this figure.

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