CIS Tax Refund Calculator
Subcontractors: 20% CIS deductions usually overshoot what you actually owe once expenses are claimed. Estimate your refund in seconds.
Why CIS subcontractors get refunds
Contractors deduct 20% from registered subcontractors’ labour payments (30% if unregistered) and pass it to HMRC. But your real bill is worked out on profit after expenses — tools, van, materials, insurance — so the deductions often add up to more tax than you owe. The difference comes back as a refund after your self-assessment.
We prepare CIS returns for builders and electricians across London — claiming every allowable expense so the refund is as big as the law allows.
Speak to an ACCA-qualified accountant today
Free 30-minute consultation. Clear advice, fixed pricing and a plan you can act on.
Frequently asked questions
Contractors deduct 20% (or 30% if unverified) from labour invoices. That ignores your personal allowance and expenses, so many subcontractors overpay during the year and reclaim it through Self Assessment.
Enter gross labour income, expenses and CIS deducted u2014 the calculator works out the tax and Class 4 NI actually due and shows the difference as your estimated refund.
Usually within 2u20136 weeks of filing your Self Assessment, faster when filed early in the tax year with accurate CIS statements.