CIS Tax for Contractors UK —
Monthly Returns, Refunds & Gross Status

Contractors must verify every new subcontractor before making the first payment. Without verification you must deduct at 30% — the unverified rate. We handle all subcontractor verification within 24 hours of notification.

CIS deductions only apply to the labour element — not materials separately stated. Incorrectly deducting from the full invoice over-deducts tax and creates a mismatch in HMRC records. We correctly identify the labour-only amount for every CIS payment.

Even in months with no subcontractor payments, a nil CIS return must be filed by the 19th — or HMRC notified that you’re inactive. Missing nil returns creates £100 automatic penalties per month. We file nil returns automatically for all clients.

Many self-employed subcontractors are unaware that CIS deductions create a tax credit claimed in their Self Assessment. We claim every CIS credit in every client’s annual return — often generating substantial refunds.

All businesses paying subcontractors for construction work must register as CIS contractors. Subcontractors receiving CIS payments should also register — registered subcontractors are deducted at 20% rather than 30%. Qualifying subcontractors can apply for gross payment status (0% deduction).

Late CIS monthly returns trigger automatic penalties: £100 up to 2 months late, £200 for 2-6 months, plus additional daily charges and tax-geared penalties for very late returns. Penalties are per return — a year of late filing can cost over £3,000. We file every CIS return by the 19th, every month, without exception.

To qualify for gross payment status, your business must pass three HMRC tests: a business test (genuine construction business with UK bank account), a turnover test (net construction turnover above £30,000 for sole traders or higher for companies) and a compliance test (clean tax record for previous 12 months). We assess eligibility and manage the full application.

Yes — CIS deductions suffered by subcontractors can be offset against PAYE liabilities (if you employ staff) or reclaimed via Self Assessment or Corporation Tax return. If deductions exceed your tax liability, HMRC issues a refund. We track all deductions and claim maximum refunds for every subcontractor client.

Once verified, you don’t need to re-verify the same subcontractor unless they’ve been inactive in your CIS scheme for 2 years. We maintain verification records for all subcontractors and flag when re-verification is required.