Free CIS Rebate Calculator for UK Construction Subcontractors
Find out exactly how much CIS tax refund you are owed from HMRC — takes under 2 minutes, completely free, no login required.
Why use CIS Rebate Calculator?
Built specifically for UK construction workers to reclaim overpaid CIS tax
Instant rebate estimate
Enter your gross income, CIS deductions and expenses. Get your estimated CIS tax rebate in seconds.
Missed expenses finder
We highlight expenses you may have forgotten — tools, PPE, mileage, insurance and more.
Fully private
No data is stored or shared. Your figures stay in your browser only — always.
Mobile friendly
Works perfectly on your phone on-site or at home on any device.
How your CIS rebate is calculated
Most subcontractors overpay tax every year — here is why
Contractor deducts 20%
Every contractor takes 20% CIS from your payments and sends it to HMRC on your behalf.
No allowances applied
The 20% deduction ignores your £12,570 personal allowance and all your business expenses.
You overpay tax
Your actual tax bill — after allowances and expenses — is almost always lower than what was taken.
HMRC owes you a rebate
You reclaim the difference via Self Assessment. Our free calculator shows your estimate instantly.
What expenses can subcontractors claim?
Every pound of expenses reduces your taxable profit and increases your rebate
Tools & equipment
Hand tools, power tools, specialist equipment — if you bought it for work, you can claim it.
PPE & workwear
Hi-vis vests, hard hats, steel-toe boots, work gloves and branded work clothing.
Travel between sites
HMRC allows 45p per mile for the first 10,000 miles when travelling between job sites.
Phone & communications
Business mobile, calls to clients and contractors, or a proportion of your personal phone bill.
Insurance
Public liability insurance, trade insurance and professional indemnity premiums.
Other business costs
Accountancy fees, training courses, equipment hire, business subscriptions and materials.
Ready to find your CIS rebate?
Free, instant and no sign-up required. Takes less than 2 minutes.
Use the Free CIS Rebate Calculator