BR Tax Code: What It Means and What to Do Next

A BR tax code on your payslip could mean you are paying too much income tax.

The BR tax code tells your employer to deduct income tax at the basic rate of 20% on all earnings from that source.

No personal allowance is applied under a BR tax code, so you pay tax from the first pound you earn.

That distinction can be costly — the personal allowance may be worth over £2,500 a year to a basic-rate taxpayer.

The BR tax code appears in a range of situations, some temporary and some entirely appropriate.

Knowing which applies to you is the first step to making sure your deductions are correct.

This guide explains what the BR tax code means, why HMRC issues it, and how the variants differ.

It also covers how to contact HMRC to query or change your code, and what to do if you have overpaid.

BR Tax Code Meaning: What It Actually Does

Every PAYE taxpayer in the UK is assigned a tax code by HMRC.

That code tells your employer how much income tax to deduct from your wages before you are paid.

The BR tax code applies a flat 20% rate to all earnings from a particular income source.

Unlike a standard tax code like the 1257L code, it does not account for your personal allowance.

For example the personal allowance for the 2025/26 tax year is £12,570 — the amount you may earn before income tax becomes due.

With a BR tax code in place, your employer ignores that threshold and taxes your full earnings.

This does not automatically mean something has gone wrong.

For a second job or pension, applying no personal allowance to that source may be entirely correct.

Why You Might Have This Code

HMRC and employers rely on accurate records to assign the right tax code.

When that information is missing or incomplete, a BR tax code is often issued as a temporary measure.

Three situations tend to trigger this outcome most frequently:

• Starting a new job without providing a P45 — your P45 confirms your previous code and year-to-date earnings.
• Moving from self-employment into PAYE employment, where HMRC needs time to update its records.
• Holding a second job or additional pension, where your personal allowance is already allocated to your main income.

In the first two cases, the code is likely a holding position while records are updated.

In the third, it may be entirely accurate and does not necessarily signal an error.

BR Tax Code Variants Explained

The BR tax code is not a single fixed code — it appears in several forms.

Each variant calculates tax differently, so it is worth knowing which one applies to you.

BR Cumul (Cumulative)

A BR cumul code calculates your deductions on a cumulative basis.

It considers all earnings and tax paid since the start of the tax year before deciding what to deduct next.

This approach aims to keep your total tax accurate across the whole year.

Each pay period takes account of the ones before it, rather than treating them in isolation.

BR NonCum (Non-Cumulative)

A BR NonCum code applies the 20% rate to each pay period independently.

It does not look back at previous periods, which can cause discrepancies to build over time.

A non-cumulative code is often indicated by a W1 (weekly) or M1 (monthly) suffix.

HMRC may later adjust the code or issue a repayment once it reviews the position.

SBR and CBR

An SBR code is the Scottish equivalent of BR, used for taxpayers paying under Scottish income tax rates.

A CBR code performs the same function for Welsh taxpayers under the Welsh rates system.

The Real Cost of an Incorrect Code

If a BR code has been applied when you should have one that includes your personal allowance, the difference may be significant.

A simple example from the 2025/2026 tax year helps to illustrate the potential gap:

• An employee earning £28,000 with the standard 1257L code in 2025/26 would pay tax on approximately £15,430.
• At 20%, the income tax liability could be around £3,086 for the year.
• The same employee on a BR code would pay 20% on the full £28,000.
• That produces a tax bill of around £5,600 — roughly £2,514 more than under the standard code.

These figures are approximate and based on the 2025/26 allowance and basic rate.

Your actual position may vary if other tax reliefs or deductions like taxable company benefits apply.

How to Check Your Tax Code

Checking your tax code takes only a few minutes and costs nothing.

Your current code appears on your payslip, your P60, and any P45 issued when you left a previous job.

• You may also view your tax code through your Personal Tax Account on GOV.UK.

Logging in takes a couple of minutes and shows your current code alongside any notices HMRC has issued.

• The HMRC app — available free on iOS and Android — also displays your current tax code.

It offers a straightforward way to check your code at any time without needing to call or write to HMRC.

Once you have your code, consider whether BR makes sense for your situation.

If this is your only source of employment income and your tax affairs are straightforward, the code may be resulting in overpayment.

Visit our tax codes guide for more information on how tax codes work and what to do if you need yours changed.

How to Contact HMRC About Your Tax Code

If you believe your tax code is incorrect, you may contact HMRC to query or change it.

HMRC offers several ways to get in touch, so you can choose whichever suits you best.

Online — Personal Tax Account

The quickest route for most people is through the Personal Tax Account on GOV.UK.

Once logged in, you can check your current tax code and report a change in your circumstances directly.

HMRC may be able to update your code online without the need for a phone call.

HMRC App

The HMRC app lets you view your tax code and contact HMRC securely from your phone.

You can send a message and receive a reply without waiting on hold.

The app is free to download and uses the same Government Gateway login as your Personal Tax Account.

Search for “HMRC” in the App Store or Google Play to download it.

By Phone

You may also call the HMRC income tax helpline on 0300 200 3300.

Lines are open Monday to Friday, 8am to 6pm, and the helpline handles queries about PAYE tax codes.

It is worth having your National Insurance number and payslip to hand before you call.

HMRC can issue a corrected code directly to your employer, which takes effect from the next payroll run.

What to Tell HMRC

When you make contact, explain that you believe you are on a BR tax code in error.

HMRC may ask about your employment situation, other income sources, and whether you have a P45 available.

In many cases, the matter can be resolved in a single contact.

Your employer applies the updated code as soon as they receive it from HMRC.

Reclaiming an Overpayment

If a BR tax code was applied incorrectly, you could be entitled to reclaim the difference.

Where the overpayment falls within the current tax year, your employer may adjust future deductions once the code is corrected.

For overpayments in previous tax years, HMRC typically repays the difference directly.

Payment is made by cheque or bank transfer once HMRC confirms the amount owed.

However, a repayment can only be processed after your code has been corrected and verified.

You may generally claim back overpaid tax for up to four previous tax years.

For 2025/26, that potentially covers as far back as 2021/22.

Keeping your payslips and P60s makes it more straightforward to refer back to the relevant periods.

Higher-Rate Taxpayers and the BR Tax Code

For most people, the risk with a BR tax code is overpayment.

For higher-rate taxpayers, the risk runs in the opposite direction.

If your total income exceeds £50,270 in 2025/26, some earnings attract tax at 40%.

A BR code on a secondary income source would only deduct 20%, potentially leaving a shortfall.

HMRC may expect a D0 code in this situation, which applies the 40% rate rather than 20%.

If a BR code has been applied instead, the underpayment may not come to light until year-end reconciliation.

Discovering a tax liability at that point can come as an unwelcome surprise.

If you pay tax at the higher rate and hold a BR code on a secondary income, it is worth reviewing your position early.

BR Tax Code: A Quick Summary

The BR tax code applies 20% income tax to all earnings from a given source, with no personal allowance included.

It appears for a range of reasons — from a missing P45 to a second job or pension — and is sometimes entirely correct.

Checking your code is straightforward through your payslip, Personal Tax Account, or the HMRC app.

If you believe the code is wrong, contacting HMRC online, via the app, or by phone is the quickest way to resolve it.

Key Tax Code Takeaways

The most important points from this guide are summarised below:

• A BR tax code means all income from that source is taxed at 20%, with no personal allowance applied.
• The code is often a temporary measure while HMRC or your employer gathers the information needed to assign the correct code.
• For a second job or pension, a BR code may be entirely appropriate and does not indicate an error.
• The cumulative version (BR Cumul) accounts for year-to-date earnings; the non-cumulative version (BR NonCum, W1, or M1) treats each pay period independently.
• You may check and query your tax code through your Personal Tax Account on GOV.UK, the free HMRC app, or by calling 0300 200 3300.
• Overpaid tax from an incorrect BR code can generally be reclaimed for up to four previous tax years.
• Higher-rate taxpayers with a BR code on secondary income may be underpaying tax rather than overpaying.

BR Tax Code FAQs

Q1: What does a BR tax code mean?

A BR tax code instructs your employer to deduct income tax at the basic rate of 20% on all earnings from that income source. No personal allowance is applied, so tax is deducted from the first pound you earn through that employment or pension. The code is common when HMRC does not yet have the information it needs to assign a more tailored code.

Q2: Why do I have a BR tax code?

A BR tax code is often assigned when you start a new job without providing a P45, or when you move into PAYE employment from self-employment. It is also used for second jobs and secondary pensions, where the personal allowance is already allocated to a primary income source. In some cases it is a temporary measure while HMRC updates its records.

Q3: How do I contact HMRC to change my tax code?

You may update or query your tax code through your Personal Tax Account at www.gov.uk/personal-tax-account, through the HMRC app on iOS or Android, or by calling the income tax helpline on 0300 200 3300 (Monday to Friday, 8am to 6pm). Have your National Insurance number to hand. Once HMRC issues a corrected code, your employer applies it from the next available payroll run.

Q4: What is the difference between BR Cumul and BR NonCum?

BR Cumul (cumulative) calculates your tax by taking into account all earnings and deductions since the start of the tax year. BR NonCum (non-cumulative) applies the 20% rate to each pay period independently, without reference to earlier periods. Non-cumulative codes are often identified by a W1 (weekly) or M1 (monthly) suffix in the tax code.

Q5: Can I reclaim tax if I was on a BR tax code by mistake?

Yes, you may be entitled to reclaim the difference if a BR tax code was applied incorrectly and caused you to overpay. In-year overpayments may be adjusted through your payslip once the code is corrected. For previous tax years, HMRC can repay the difference directly, and claims can generally be made for up to four previous tax years.