How long HMRC takes for a Self Assessment refund is usually a few weeks for an online return paid by BACS, but the actual wait depends on when you filed, whether HMRC flags the return for review, and how you asked to be paid. Once HMRC releases the money, a BACS transfer takes about three working days to land; a cheque takes considerably longer. Paper returns run to roughly six weeks from the date HMRC receives them.
What Happens Between Filing and Payment
Online returns move fastest because HMRC’s system can cross-check figures automatically against employer and other financial records. Paper returns are handled manually, which is why refunds claimed on paper generally take around six weeks.
HMRC does not publish a binding deadline for issuing Self Assessment refunds. It does run an online tool, updated weekly, that shows current expected reply times for Self Assessment and other tax queries. Checking it before you start chasing gives you a realistic sense of how backed up the queue is.1GOV.UK. Check When You Can Expect a Reply From HMRC
One quirk catches people out. If you have a payment on account due within the next 45 days, HMRC will hold your refund and offset it against that upcoming bill rather than send the money and collect it back. File in December or January with a 31 January payment on account looming, and the offset is almost certain to apply.
You Have to Request the Refund
Filing the return doesn’t trigger a payment on its own. After you submit and see an overpayment, log into your HMRC online account and use the “Request a Self Assessment Refund” option. Confirm your bank details for a BACS transfer, or opt for a cheque.
If you want the money to go to someone else, such as your tax adviser, you can nominate them using an R38 form or a letter. The refund still legally belongs to you, and you can cancel the nomination any time before HMRC issues the payment, including by phone.2HM Revenue & Customs. Self Assessment Manual – SAM110130 – Repayments: Issue Repayment: Nominations and Assignments
Since March 2023, assignment letters no longer work. Any assignment received after that date is legally invalid, and the refund stays in your name. Nominations still function normally.2HM Revenue & Customs. Self Assessment Manual – SAM110130 – Repayments: Issue Repayment: Nominations and Assignments
How Fast the Money Arrives
Once HMRC approves and issues the payment, the delivery method decides the last leg of the wait.
- BACS transfer usually takes three working days to reach your bank account after HMRC releases it.3GOV.UK. Pay Your Self Assessment Tax Bill – Make an Online or Telephone Bank Transfer
- A cheque has to travel through the post and clear at your bank. For refunds claimed on paper or through P800 calculations, allow up to six weeks from the point HMRC processes the claim to the cheque arriving.
If you haven’t given HMRC bank details, the default is a cheque. Check your account information before you request the refund.
Wrong Bank Details
Getting the account number wrong is the mistake with the slowest fix. If the number doesn’t exist, the payment bounces back and HMRC reissues it, adding weeks. If the number happens to belong to someone else, recovery gets much harder: HMRC may need to write to the receiving bank, and getting your money back depends on the other account holder cooperating. Verify your sort code and account number carefully.
What Slows a Refund Down
A few weeks is the baseline. Several things stretch it.
The January Filing Surge
The online Self Assessment deadline is 31 January. Millions of returns land in the final weeks before it, and refunds filed in mid-January take longer than those filed in April or May. Filing early in the tax year is the simplest way to shorten your wait.
Security and Identity Checks
High-value claims and unusual patterns get flagged for manual review. HMRC may ask you to confirm your identity or specific figures on the return, and can request documents such as your passport, driving licence, recent bank statements, or utility bills. The refund won’t move until HMRC is satisfied, so responding quickly matters.
Formal Enquiries
A formal enquiry is a different situation from a routine security check. HMRC can open one within 12 months of your filing date if you submitted on time, and it has broader powers to examine records and request documentation. Not every enquiry freezes a refund, but a pending investigation gives HMRC reason to hold payment until the review concludes. Enquiries can run for months depending on complexity.
Outstanding Tax Debts
HMRC offsets refunds against money you owe before releasing anything to you. Unpaid tax from earlier years, outstanding penalties, and student loan overpayments collected through Self Assessment can all absorb some or all of the refund. This is a common reason expected money never lands.
Checking Where Your Refund Is
You can track progress through your HMRC online account or the HMRC app using your Government Gateway user ID and password. Once logged in, the Self Assessment section shows your payment history and any pending repayments.
Keep your 10-digit Unique Taxpayer Reference to hand. It appears in your Personal Tax Account, on previous tax returns, and on letters from HMRC where it may be labelled “reference,” “UTR,” or “official use.”4GOV.UK. Find Your UTR Number Your National Insurance number helps with phone identity checks.
For a broader estimate of queue length rather than a live status, the “Check when you can expect a reply from HMRC” tool covers Self Assessment alongside other tax topics.1GOV.UK. Check When You Can Expect a Reply From HMRC
Interest If HMRC Is Late
When HMRC takes longer than it should, it pays repayment interest on the amount owed. As of January 2026, the rate is 2.75%, calculated as the Bank of England base rate minus 1% with a floor of 0.5%.5GOV.UK. HMRC Interest Rates for Late and Early Payments
Interest accrues automatically, so you don’t need to claim it separately. The rate is modest: on a £1,000 refund delayed three months, you’d see roughly £6.88 in interest. It compensates for the wait without making one worth wanting.
When the Wait Becomes Unreasonable
If your refund is stuck well beyond the expected timeframe and informal contact through webchat or phone isn’t getting answers, HMRC has a formal complaints process. You can file online, by phone, or by post, giving your UTR or National Insurance number, the dates involved, and the resolution you want.6GOV.UK. Complain About HMRC
A first-tier review looks at what happened and what should have happened, and can refund reasonable costs caused by HMRC’s mistakes or delays, including postage, phone charges, and professional fees. If you’re unhappy with the outcome, a second-tier review by a different reviewer is available, and that decision is final within HMRC. Beyond HMRC, you can escalate to the Adjudicator’s Office and ultimately, through your MP, to the Parliamentary and Health Service Ombudsman.6GOV.UK. Complain About HMRC