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Planned tool

CIS rebate calculator for UK subcontractors.

This calculator is planned, not live yet. The goal is simple: help UK subcontractors estimate whether CIS deducted through the year may turn into a tax refund after expenses and self-assessment.

What the calculator will estimate

Gross subcontractor income

Total CIS income across the tax year before deductions.

CIS already deducted

The amount contractors have withheld and paid to HMRC.

Allowable expenses

Tools, materials, van costs, insurance, phone, workwear and other business costs.

Estimated rebate

A plain-English estimate of whether too much tax has been collected up front.

Background

How CIS rebates work

Under the Construction Industry Scheme, contractors deduct tax from a subcontractor's labour payments before the subcontractor receives the money. For most registered subcontractors the rate is 20%. Unregistered subcontractors are usually deducted at 30%.

That deduction is not the final tax bill. At the end of the tax year, your income, business expenses, personal allowance and any other income are reconciled through self-assessment. If the CIS deducted was higher than the final tax due, HMRC may refund the difference.

While this page waits for the full rebate calculator, you can use the CIS calculator for individual invoices and keep a running record of deductions shown on your contractor payment statements.

FAQ

CIS rebate questions

What is a CIS rebate?
A CIS rebate is money HMRC may owe you after contractors have deducted CIS from your labour payments and your actual tax position is worked out at self-assessment.
Why do subcontractors often get CIS refunds?
CIS is deducted from labour before your full business expenses, personal allowance and final income tax bill are known. If too much was deducted, the difference can become a refund.
What affects a CIS rebate?
Gross income, CIS already deducted, allowable business expenses, personal allowance, other income and National Insurance all affect the final figure.
Is this the same as the per-invoice CIS calculator?
No. The CIS calculator works out a deduction on one invoice. A CIS rebate calculator estimates the year-end position across the whole tax year.
When will the calculator be live?
It is planned as part of the next Syntorak Tools build. This holding page exists so subcontractors can find the topic now and so we can measure interest before building the full calculator.

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This page is educational and is not tax advice. The full calculator will also be an estimate only. Always check your records and HMRC guidance, or speak to a qualified accountant.