2025/26 Tax Year
CIS Tax Refund Calculator UK
Estimate your CIS refund, Income Tax, National Insurance and take-home pay for the 2025/26 tax year.
£
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
