A BR tax code refund is what you’re owed when HMRC’s Basic Rate code has stripped a flat 20 percent from your pay without applying any of your £12,570 Personal Allowance. If your total income for the year sits below that allowance, or the code was assigned in error, every pound withheld is recoverable. Most online claims paid by bank transfer arrive within five working days.1GOV.UK. Tax Overpayments and Underpayments: If Your Tax Calculation Letter (P800) Says You’re Due a Refund
BR stands for Basic Rate. On your payslip it means your employer is deducting 20 percent from the first pound of that income, with no tax-free slice built in. HMRC usually applies BR to a second job or a private pension on the assumption your main employment already uses your Personal Allowance through a code like 1257L.2GOV.UK. Income Tax Rates and Personal Allowances When that assumption is wrong, you overpay.
When a BR Code Actually Means You’ve Overpaid
Not every BR code is a mistake. It becomes one in a few recognisable situations.
You started a new job and your P45 didn’t reach the new employer in time. Without your previous pay and tax figures, they default to BR. Weeks of 20 percent deductions can pile up before the code corrects. HMRC advises waiting 35 days for records to update before chasing.3GOV.UK. If You Think Your Tax Code Is Wrong
Your total income across all sources for the year stays below £12,570. BR ignores this and taxes anyway. Someone earning £10,000 from a second job on BR loses £2,000 that was never owed.2GOV.UK. Income Tax Rates and Personal Allowances
You stopped working partway through the tax year. PAYE has been deducting as though you’d earn the same amount every month until April. When the real total falls short, the withheld tax overshoots. A BR code makes the gap larger because no allowance was ever applied.
You’re drawing a pension alongside employment, or the pension is your only income. HMRC often codes pensions BR by default. If the pension itself falls inside your allowance, or your combined income does, the deductions are too high.
Fix the Code Before You Claim a Refund
If the tax year hasn’t ended and BR is still on your payslip, correcting the code is faster than waiting to reclaim. Sign in to the “Check your Income Tax” service on GOV.UK and update your employment and pension details. HMRC recalculates and issues your employer a revised code, and any overpayment from earlier months in the year usually refunds automatically through your next few payslips.3GOV.UK. If You Think Your Tax Code Is Wrong
If you can’t use the online service, call the income tax helpline on 0300 200 3300 with your National Insurance number and a recent payslip. The advisor can update the code over the phone, though your employer needs a payroll cycle or two to apply it.4GOV.UK. Income Tax: Enquiries
Sorting this out in October rather than the following May saves months of unnecessary deductions and skips the formal refund process entirely.
What You’ll Need to Claim
Gather these before you contact HMRC or start an online claim:
- Your National Insurance number, from a payslip, P60, or your personal tax account.
- Your P60, issued by your employer after 5 April, showing total pay and total tax deducted for the year. This is the main evidence of overpayment.5GOV.UK. Your P45, P60 and P11D Form: P60
- Your P45, given when you leave a job. Not passing it to a new employer is often what puts you on BR in the first place.6GOV.UK. Your P45, P60 and P11D Form: Why You Get Each Form
- A P800 tax calculation letter, if HMRC has sent one. These go out automatically between June and November when HMRC’s records show an overpayment, and they state the exact refund amount.7GOV.UK. Tax Overpayments and Underpayments
No P800 by December doesn’t mean you’re not owed money. You can start a claim through your personal tax account or by phone whether or not one has arrived.
Three Ways to Claim
Online
Sign in to your personal tax account on GOV.UK using Government Gateway credentials. Once verified, you can review your income for the current and previous five tax years.8GOV.UK. Personal Tax Account: Sign In or Set Up If a P800 has been issued and it says you can claim online, you’ll need the reference number from the letter and your National Insurance number. You choose between a bank transfer and a cheque.1GOV.UK. Tax Overpayments and Underpayments: If Your Tax Calculation Letter (P800) Says You’re Due a Refund
By Phone
Call 0300 200 3300 and, when prompted, say “income tax” or “tax refund” to reach the right team. Have your National Insurance number, employer details, and the tax year in question ready. The advisor can process the claim and arrange payment.4GOV.UK. Income Tax: Enquiries
By Post
Write to HMRC’s PAYE and Self Assessment office with your full name, address, National Insurance number, the tax year, and an explanation of why you’ve overpaid. Include copies (not originals) of your P60 or P45. Post is the slowest route and is worth using only when online and phone can’t resolve the issue.
How Long Payment Takes
- Online bank transfer after a P800 claim: five working days from submission.1GOV.UK. Tax Overpayments and Underpayments: If Your Tax Calculation Letter (P800) Says You’re Due a Refund
- Cheque requested online after a P800: up to six weeks.1GOV.UK. Tax Overpayments and Underpayments: If Your Tax Calculation Letter (P800) Says You’re Due a Refund
- Cheque sent automatically because your P800 letter says one is coming: within 14 days of the date on the letter, with nothing further needed from you.1GOV.UK. Tax Overpayments and Underpayments: If Your Tax Calculation Letter (P800) Says You’re Due a Refund
Bank the cheque promptly. HMRC payable orders expire, and requesting a replacement adds weeks.
How Far Back You Can Claim
You have four years from the end of the tax year in which you overpaid. For the 2025–26 tax year (ending 5 April 2026), the deadline is 5 April 2030. After that, HMRC treats the year as closed.9GOV.UK. SACM12155 – Overpayment Relief: Time Limits for Making a Claim
If BR has been on your code for several years, check each year separately in your personal tax account. Start with the oldest, so the earliest year doesn’t expire while you work through the more recent ones.
Interest on What You’re Owed
HMRC pays repayment interest on overpayments at the Bank of England base rate minus one percent, with a 0.5 percent floor. As of January 2026 the rate is 2.75 percent.10GOV.UK. HMRC Interest Rates for Late and Early Payments Interest accrues automatically, so you don’t request it separately. On a refund covering several months or years of wrong coding, it can add up.
If You Live in Scotland
Scottish income tax rates and bands are set by the Scottish Parliament: a 19 percent starter rate, a 20 percent basic rate on £15,398 to £27,491, a 21 percent intermediate rate, and a 42 percent higher rate.11GOV.UK. Income Tax in Scotland: Current Rates Your code should begin with S, for example S1257L or SBR. SBR still deducts 20 percent, and the refund process is the same because HMRC administers both systems. If your code is missing the S prefix, that’s a separate problem worth fixing before you claim.
Watch for Refund Scams
Fake refund messages spike between June and November, when genuine P800 letters go out. HMRC will never ask for personal or financial information by email, text, or phone call.12GOV.UK. Check if an Email You’ve Received From HMRC Is Genuine Real notifications arrive either as a paper P800 in the post or as a message inside your personal tax account. Anything by email or text asking for card details, bank numbers, or passwords is fake. Forward suspicious emails to phishing@hmrc.gov.uk and texts to 60599. When in doubt, ignore the message and log in to your personal tax account directly; if a refund is waiting, it will be there.