CIS Refunds
CIS Back Years Tax Refund Guide: How to Claim Up to Four Years of Overpaid Deductions
Most registered CIS subcontractors overpay tax every year, because the 20% deduction is taken on labour before any expenses or personal allowance are accounted for. HMRC lets you reclaim those overpayments going back four tax years. This guide explains the four-year lookback rule, which years are currently open, the process for unfiled versus amendable returns, the records you need, the claim-by deadlines, the repayment timeline and interest, and works through realistic multi-year examples with real pound figures.