CIS Tax Refund Timeline: How Long Does HMRC Take to Pay?

Filed your Self Assessment and now you're watching your bank account? Here's exactly what happens after you submit, what holds CIS refunds up — and what you can do to get paid faster.

You've done the hard part. You've worked all year with 20% taken off every labour payment, you've filed your Self Assessment, and HMRC owes you money. So why isn't it in your account yet?

The honest answer is that it depends — on when you filed, how you filed, and whether HMRC decides to look more closely at your return. This guide breaks down every stage, every common delay, and exactly what you can do to push things along.

The CIS Refund Timeline, Stage by Stage

A CIS refund doesn't happen automatically. HMRC doesn't know how much you're owed until you tell them — through your Self Assessment. Here's what happens from that point.

1. From 6 April: you can file. The tax year ends on 5 April. From the next day, you can submit your Self Assessment for the year just ended. You don't have to wait until January — and if you're owed money, you shouldn't.
2. You submit your return online. Your total CIS deductions go in Box 38 on the SA103S (short form) or Box 82 on the SA103F (full form). This figure must exactly match the payment and deduction statements from your contractors.
3. HMRC receives and calculates — usually within days. Online returns are acknowledged quickly and HMRC's systems produce your tax calculation (SA302), which you can view in your online account. This confirms the figure — it doesn't mean the refund has been approved yet.
4. HMRC checks your CIS figures — this is where most of the wait happens. Your claim is cross-referenced against the monthly CIS returns (CIS300) your contractors filed. If everything lines up, the repayment is approved. If it doesn't, HMRC may pause it or write to you.
5. The money reaches your bank. HMRC pays by bank transfer to the account on your HMRC record. Once the repayment is issued, allow a few working days (typically 3–5) for it to clear.

Online vs Paper: Why It Makes Such a Big Difference

Filing on paper is one of the biggest reasons subcontractors wait longer than they need to.

Always file online. It's faster to process and faster to pay.

What HMRC Actually Does With Your CIS Figures

This step explains why timelines vary so much. When you claim CIS deductions on your Self Assessment, you're telling HMRC: "My contractors deducted this much from my payments this year."

HMRC checks that against a separate set of records: the monthly CIS returns your contractors submitted throughout the year, listing every subcontractor they paid and the deduction taken. If your figure matches, the process is smooth. If it doesn't — even by a small amount — HMRC flags the discrepancy.

Mismatches happen more often than you'd think — and usually not because of anything you did:

• A contractor submitted their monthly return late or used the wrong figures
• You worked for a contractor who didn't register properly for CIS
• A payment was recorded under the wrong UTR by mistake
• Materials were incorrectly included in the deduction calculation

The 5 Most Common Reasons Your CIS Refund Is Delayed

If your refund is taking longer than expected, one of these is almost certainly why.

1. Your CIS figures don't match what contractors reported

The most common cause by far. Fix: collect every payment and deduction statement for the year and add up the deductions exactly — no estimates.

2. HMRC doesn't have your bank details

HMRC pays by bank transfer to the account on your HMRC record. If your details are missing or out of date, your repayment will take longer to reach you. Fix: before you file, log in to your HMRC online account and confirm your repayment bank details are saved and current. It takes two minutes and removes a common delay entirely.

3. HMRC opened a compliance check

HMRC routinely selects some returns for extra checks — sometimes because expenses look high, income changed sharply, or CIS figures are hard to match, and sometimes at random. It's not an accusation, but it pauses your refund. Fix: read the letter carefully, gather your deduction statements and expense records, and respond within the deadline given (typically 30 days). Prompt, complete answers usually resolve it far faster; ignoring the letter can lead HMRC to amend your return and reduce your refund.

4. You filed during peak season

The weeks around the 31 January deadline are HMRC's busiest of the year. The same return filed in May usually moves much faster than one filed in January. Fix: if you're owed a refund, file in spring or summer.

5. HMRC offset your refund against money you owe

If you owe HMRC from a previous year, a penalty, or a Payment on Account, they'll take that first and pay you the rest. For example, a £1,400 refund with £600 outstanding means £800 reaches your bank. Your tax calculation will show the offset line by line. Fix: check your HMRC account for outstanding balances before you file, so there are no surprises.

When to File for the Fastest Possible Refund

Here's how two subcontractors with identical claims can wait very different lengths of time (illustrative example):

Filing in April or May puts you ahead of most filers — at the time HMRC's workload is lowest. It also leaves you months to fix any mismatch before the deadline.

How to Check Where Your Refund Is Right Now

1. Log in to your HMRC online account at gov.uk with your Government Gateway details, and open Self Assessment. You'll see whether your return has been processed and whether a repayment has been issued.
2. Check the status. If a repayment has been issued, allow a few working days for your bank to clear it. If it's still pending, it's in the queue.
3. Confirm your bank details are correct in the same account — an out-of-date account is an easy delay to fix.
4. Still nothing after 8 weeks? Call HMRC. The Self Assessment helpline is 0300 200 3310 (Monday to Friday, 8am to 6pm). Have your UTR ready and ask specifically: "Has my repayment been approved, and when was it issued?"

Are You Getting Back the Right Amount?

Speed matters — but so does accuracy. Your refund is the difference between the CIS already deducted (usually 20%) and your actual tax bill for the year. That bill depends on:

• Your total taxable income from all sources in the year
• Your Personal Allowance: £12,570 — income below this is tax-free
• Allowable business expenses: tools, PPE, phone, and mileage at 45p per mile for the first 10,000 miles
• Class 4 National Insurance on your profits
• Any Payments on Account already made

Every allowable expense you miss reduces your refund. Before you chase HMRC for speed, make sure you've claimed everything you're entitled to.

How Far Back Can You Claim? The 4-Year Rule

If you've worked under CIS for several years and never filed — or filed without claiming everything — there may be far more waiting for you than this year's refund. HMRC allows claims for up to 4 tax years. After that, the money is gone for good.

Here's why it's worth checking. Imagine £3,200 deducted each year when your actual tax bill was £1,400: that's £1,800 overpaid per year — £5,400 across three unclaimed years (illustrative example). Each back year needs its own Self Assessment return, and older returns are more likely to get a closer look, so allow extra time.

Two Illustrative Examples: Same Rules, Different Outcomes

The Refund Checklist: Before You Chase HMRC

Most refund delays trace back to one of these points — and several can be fixed without a phone call.

• I filed my Self Assessment online, not on paper
• My bank details in my HMRC online account are correct and current
• My CIS deduction figure matches my payment and deduction statements
• My UTR is correct on the return
• I haven't got any unanswered letters from HMRC
• I've checked for outstanding balances or Payments on Account that could be offset
• It's been at least 4 weeks since I submitted (longer if I filed near the January deadline)
• I can log in to my HMRC account to check my status

This article is for general information only and does not constitute tax advice. Tax rules and HMRC guidance can change — always check gov.uk or speak to a qualified tax adviser about your circumstances. QuoteDone is not affiliated with or endorsed by HMRC.