2025/26 Tax Year
Free CIS Refund Calculator UK
Use our free CIS refund calculator UK to estimate how much CIS refund you may be owed. Designed for subcontractors, this CIS tax rebate calculator provides a quick estimate before you submit your claim.
£
Income
£
−
Allowable Expenses
£
Must be wholly and exclusively for business purposes.
miles
Flat rate allowance£0.00
45p per mile (first 10,000) then 25p per mile thereafter.
£
Includes Annual Investment Allowance and other capital allowances.
Where actual expenses are below £1,000, the calculator uses the £1,000 trading allowance instead. This cannot create a trading loss or tax refund by itself.
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Pension Contributions
£
Relief at source pension — extends your basic rate band.
NI
National Insurance
Pay voluntary Class 2 NI (£3.45/week)
Class 2 is voluntary. If profits are between £6,845 – £12,570 it's treated as paid. Above £12,570, Class 4 NI applies automatically.
CIS
CIS Deduction
CIS deduction is calculated on total self-employed income before expenses.
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Your Results Will Appear Here
Enter your income and expenses, then hit calculate to see your tax and CIS refund breakdown.
Your Tax Breakdown
Estimated figures for 2025/26
Profits
Total Income£0
Allowable Expenses-£0
Trading Allowance-£0
Adjusted Profit£0
Income Tax
Personal Allowance£12,570
Taxable Income£0
Basic Rate (20%)£0
Higher Rate (40%)£0
Additional Rate (45%)£0
Total Income Tax£0
Basic 20%
Higher 40%
Additional 45%
National Insurance
Class 2 NI£0
Class 4 NI£0
Total NI£0
CIS Position
CIS Rate Applied20%
CIS Deducted from Revenue£0
Final Tax + NI Liability£0
Extra Tax Still Payable£0
Summary
Total Tax + NI£0
Effective Tax Rate0%
Estimated Take-Home Pay
£0
£0 per month
Estimated CIS Refund Due
£0
Based on CIS deductions suffered less final tax + NI liability
Actual refund may vary depending on other income, benefits, student loans and tax adjustments.
Want us to claim this refund for you?
This calculator provides estimates for the 2025/26 tax year and is for guidance only. It does not constitute professional tax advice.
For personalised tax planning, speak with our advisors.
© Hammer Ledger Tax Ltd
© Hammer Ledger Tax Ltd
