How Long Does a CIS Tax Refund Take in 2026? And How to Speed It Up

If you work in construction under CIS, your refund is probably the biggest single payment you receive all year that is not wages. For most subcontractors it is somewhere between £1,500 and £3,000, sometimes much more. So the obvious question once your return goes in: how long until the money lands?

The short answer: most CIS refunds filed online arrive within 1 to 4 weeks of filing. File early in the tax year with clean, complete figures and you are usually at the fast end. Get selected for HMRC security checks, or file with gaps and mismatches, and it can stretch to 8 to 12 weeks or beyond.

The Typical CIS Refund Timeline

Your refund is triggered by filing your Self Assessment tax return. If you have not filed yet, start with our step-by-step guide on how to claim your CIS tax refund. Once the return is in, this is what normally happens:

• Days 1 to 3: HMRC's systems process the return and calculate the repayment due.
• Days 3 to 14: For most straightforward returns, the repayment is approved and released by BACS to your bank account.
• Weeks 2 to 4: Returns that need a manual look, or that were filed in a busy period, are usually paid within this window.
• Weeks 4 to 12: Returns pulled for security or verification checks. HMRC writes to you or your agent if they need anything.

What Slows a CIS Refund Down

Almost every long-delayed refund we see comes down to one of five causes:

• Security checks. HMRC screens repayment claims for fraud. A first-time claim, a much larger refund than last year, or a new bank account can all trigger a check. These add weeks, and there is no way to skip the queue once selected.
• Figures that do not match the contractor's returns. Your contractor reports your deductions to HMRC monthly. If the deductions on your return do not match what HMRC already holds, the claim stalls. This is the single most preventable delay.
• Missing CIS deduction statements. If you cannot evidence the deductions you are claiming, expect questions. Chase your contractors for statements during the year, not after it.
• Wrong details. An incorrect UTR, National Insurance number or bank account sends the repayment into manual handling.
• Existing tax debts. HMRC offsets refunds against anything you owe, including old penalties, before paying the balance out.

How to Get Your Refund Faster

• File early. The single biggest factor you control. April filers routinely see refunds inside two weeks.
• Match your figures to your CIS statements. Total the deductions from every contractor and reconcile them before filing.
• Claim your expenses properly. Mileage, tools, PPE and materials increase the refund itself. Missing them costs more than any delay.
• Give HMRC your bank details for BACS. A cheque adds a week or more.
• Use an HMRC-registered agent. Agents file returns that reconcile with HMRC's records, and when a security check does happen, they deal with it directly rather than letters going back and forth to your home address.

If the deductions themselves are the problem rather than the wait, there is a longer-term fix: gross payment status removes CIS deductions entirely, so there is no refund to wait for in the first place.

When Should You Chase HMRC?

If nothing has arrived after four weeks, check your HMRC online account first: it shows whether the repayment has been issued. If the account shows nothing moving after six weeks, call the Self Assessment helpline on 0300 200 3310 (or have your agent chase it through the agent line, which is usually quicker). Ask whether the return is under review and whether anything is needed from you.

General guidance only. Not personal tax advice. Contact us for advice specific to your situation. All figures are for the 2026/27 tax year unless otherwise stated.