What are the CIS monthly return rules for UK contractors?

Full answer

The Construction Industry Scheme (CIS) requires contractors to report and account for tax deductions from payments to subcontractors on a monthly basis. Understanding the rules avoids costly penalties. Who is a CIS contractor? You are a CIS contractor if you pay subcontractors for construction work. This includes mainstream construction companies, developers, housing associations, and businesses that spend more than GBP 3 million per year on construction in any 12-month period (deemed contractors). The CIS300 monthly return Contractors must file a CIS300 return by the 19th of the month following the tax month in which payments were made. The tax month runs from the 6th to the 5th. For example, payments made between 6 April and 5 May must be reported by 19 May. The return must include for each subcontractor paid: -- Full name and UTR (Unique Taxpayer Reference) or company registration number -- Verification reference number -- Total gross payment (including materials) -- Materials cost (deductible before calculating the CIS deduction) -- Deduction amount withheld A nil return is still required even if no subcontractors were paid in the month. Deduction rates CIS deductions apply to the labour element only (gross payment minus the cost of materials). The rates are: -- 20% for subcontractors registered under CIS -- 30% for subcontractors who are not registered (or cannot be verified) -- 0% (nil deduction) for subcontractors with gross payment status Gross payment status Subcontractors can apply for gross payment status if they meet HMRC's compliance test: turnover above GBP 30,000 per year (GBP 100,000 for companies) and a 12-month record of meeting all tax obligations. HMRC reviews gross payment status annually and can withdraw it for non-compliance. Penalties for late filing -- 1 day late: GBP 100 fixed penalty -- 2 months late: further GBP 200 -- 6 months late: GBP 300 or 5% of the CIS deductions due (whichever is higher) -- 12 months late: additional GBP 300 or 5% (total potential penalties GBP 900 minimum or 10% of deductions) For persistent non-filing the penalty can reach the total amount of CIS deductions not accounted for. Subcontractor reclaims Subcontractors who have CIS deductions withheld can offset these against their own income tax, NI and corporation tax liability via their Self Assessment or corporation tax return at year-end. If deductions exceed the liability, HMRC issues a refund.

Try the calculator