Second Job Tax Code BR Explained: How PAYE Works for Multiple Jobs 2026/27

Having two jobs can increase your income, but it also complicates your tax position. One of the biggest issues people face is the BR tax code -- but what does it mean, why does HMRC assign it, and what happens if it's wrong? This guide explains second job taxation in the UK for 2026/27.

What is a BR Tax Code?

BR stands for Basic Rate. It's a specific tax code that HMRC uses when you have multiple jobs. The code tells your secondary employer (or all but your primary employer) to apply a flat 20% income tax rate to every pound of salary you earn, without allowing you a personal allowance.

In 2026/27, the UK personal allowance is GBP 12,570. This is the amount you can earn tax-free each year. Normally, your first job uses this allowance, and you pay 20% tax only on earnings above GBP 12,570. When you have a second job, HMRC can't split the personal allowance between employers, so they apply it to your main job only and use the BR code for the secondary job.

Why HMRC Uses BR for Second Jobs

The reason is straightforward: the personal allowance is a one-time annual relief. If you earn GBP 30,000 from your first job and GBP 12,000 from a second job (total GBP 42,000), you only get one personal allowance of GBP 12,570. HMRC allocates this to your primary employment because that's where you typically earn most of your income.

Without the BR code on your second job, you'd use the allowance twice -- once at each employer -- and end up underpaying tax for the year. At the end of the tax year, you'd owe a large bill. The BR code prevents this problem by ensuring your second employer doesn't give you a personal allowance.

How the BR Code Works in Practice

Let's walk through a worked example:

Primary Job: GBP 30,000 per year

• Personal Allowance: GBP 12,570
• Taxable income: GBP 30,000 - GBP 12,570 = GBP 17,430
• Tax at 20%: GBP 17,430 × 20% = GBP 3,486
• Monthly PAYE: approximately GBP 290/month

Secondary Job: GBP 12,000 per year (BR tax code)

• Personal Allowance: None (applied to primary job)
• Taxable income: GBP 12,000 (all of it)
• Tax at 20%: GBP 12,000 × 20% = GBP 2,400
• Monthly PAYE: approximately GBP 200/month

Total annual tax: GBP 3,486 + GBP 2,400 = GBP 5,886 Combined income: GBP 42,000 Effective tax rate: 14% (lower than it would be if the allowance was used twice)

This works correctly because the tax is based on your actual combined income, not double-counted allowances.

Getting the Correct Tax Code Split

Sometimes, HMRC assigns the BR code correctly from day one. Your second employer will receive notification on the tax code notice, or you'll see the code on your payslip (usually just shown as "BR" or "1257L BR").

However, in some cases, you need to tell HMRC about your second job:

1. Inform HMRC within 3 months of starting the second job, using the online reporting system in your Personal Tax Account or by calling the HMRC Self-Assessment helpline.
2. Use the P46 form (only available offline) if you're starting a second job and your first employer hasn't registered you yet.
3. Check the coding notice when you receive notification -- it should show all your jobs and the correct code split.

If HMRC doesn't know about your second job, your second employer may default to an emergency tax code, which is often worse -- typically "L" with no allowance applied, resulting in heavy overpayment each month.

What Happens If Your BR Code is Wrong

If your second employer doesn't know they should apply BR, they might apply a standard code like "1257L" (which includes the personal allowance). This means:

• You'd use the GBP 12,570 allowance at both jobs
• Combined taxable income: (GBP 30,000 - GBP 12,570) + (GBP 12,000 - GBP 12,570) = GBP 16,860
• Correct tax: GBP 5,886
• Tax paid with wrong code: GBP 3,486 + GBP 1,886 = GBP 5,372
• Underpayment: GBP 514

At the end of the tax year (5 April 2027), when you file your tax return or HMRC reconciles your records, you'd owe GBP 514 plus interest at the Bank Rate + 2.5% (currently around 7.25% per annum).

Conversely, if your code is too strict (e.g., 647L instead of BR), you might overpay by hundreds of pounds, which you'd need to claim back.

Emergency Tax and First Month Overpayment

When you start a second job, there's often a delay before your new employer receives the correct tax code from HMRC. In the meantime, they might apply an "emergency tax code" -- typically a restricted allowance or no allowance at all. This causes significant overpayment in month 1.

For example, if you earn GBP 1,000 in your first month of a second job and are placed on an emergency code with no personal allowance, you might pay GBP 200 tax. Once the correct BR code arrives (usually within 2-4 weeks), your tax adjusts, and you'll receive a refund of overpaid tax.

Check your payslip. If you see "Emergency Tax" marked or a high tax rate in your first month, contact HMRC or wait for the correct code to be applied.

Aggregated Income and Higher Rate Tax

The BR code example above assumes both your jobs' combined income stays below GBP 50,270 (the basic rate threshold for 2026/27). But what if it doesn't?

Suppose your primary job pays GBP 45,000 and your second job pays GBP 10,000 (total GBP 55,000). The BR code at your second job still applies 20% flat, but you've aggregated into the 40% higher rate band. Here's what HMRC does:

• Your second employer continues to apply BR (20%) under the PAYE instruction.
• You file a Self-Assessment return (required because you have two employments).
• HMRC recalculates: GBP 55,000 - GBP 12,570 = GBP 42,430 at 20% (GBP 8,486) + GBP 12,570 at 40% (GBP 5,028) = GBP 13,514 total tax.
• But you've paid GBP 3,486 (primary) + GBP 2,000 (secondary at 20%) = GBP 5,486.
• You owe: GBP 13,514 - GBP 5,486 = GBP 8,028.

This is a significant bill. It's why anyone earning over GBP 50,270 in total across all jobs MUST file a tax return to settle the correct position.

Checking Your Tax Code in Your Personal Tax Account

The easiest way to verify your BR code is correct is to:

1. Log into your Personal Tax Account at gov.uk (using Government Gateway sign-in).
2. Select "Check your Income Tax summary" (or the latest tax year).
3. Look for "Tax codes and allowances" -- it should list all your employments with their codes.
4. If you see BR next to your second job and not your first, the split is correct.
5. If anything looks wrong, use the "Report a change" option or call HMRC on 0300 200 3300.

Key Takeaways

• BR code = 20% flat rate, no personal allowance applied to your second job to avoid double-counting relief.
• Tell HMRC within 3 months of starting a second job so they assign the correct code.
• Check your payslips for the first few months to catch emergency tax or wrong codes early.
• If your combined income exceeds GBP 50,270, you MUST file a tax return to pay any higher rate tax owed.
• An incorrect code can cost you hundreds at the end of the tax year -- verify in your Personal Tax Account.

Use Our Calculators

to see the impact of the BR code, or across the full year range.

The BR code isn't complicated once you understand it -- it's simply HMRC's way of ensuring one allowance per person per year. Keep your tax codes up to date, check them on your Personal Tax Account, and you'll avoid nasty surprises at the end of April.