Working Two Jobs: Why You're on a BR Tax Code and How to Fix It (2026/27)
A BR tax code on your second job isn't necessarily wrong, but it isn't always right either. How Personal Allowance splitting across two employments actually works in 2026/27.
Quick answer
Seeing your second job taxed at a flat 20% from the very first pound, with no Personal Allowance applied, is a normal and common default โ but "normal" doesn't always mean "correct for you". Whether it's right depends entirely on how much of your Personal Allowance your main job is actually using.
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Tax code checkerWhy BR happens
HMRC's system typically identifies one job as your main employment and applies your full Personal Allowance (usually via a code like 1257L) to it, then applies a BR code to any additional employment, taxing all of that income at the basic rate with no allowance carried over. This is a sensible default when your main job genuinely uses your full ยฃ12,570 Personal Allowance โ the two jobs combined then produce roughly the right total tax.
When it's wrong: part-time main job
The BR default breaks down when your "main" job is actually part-time or lower-paid and doesn't use the full ยฃ12,570 allowance by itself. In that case, some of your Personal Allowance goes unused on the main job while the second job is taxed at a flat 20% from the first pound โ meaning you're likely paying more tax overall than you should be, and could reclaim the difference by having the allowance split correctly.
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Income tax calculatorAsking for a split
You can contact HMRC directly, or use your Personal Tax Account, to request your Personal Allowance be divided between your two jobs in proportion to what each pays โ rather than accepting the default "all on job one, BR on job two" split, which may not reflect your actual pay pattern.
Second job tax guideWhen BR isn't generous enough: D0 instead
At the other extreme, if your combined income from both jobs is high enough that the second job's earnings would actually fall in the higher-rate band once combined with the first, a flat BR (20%) code under-taxes that income relative to what you'll actually owe โ a D0 code (a flat 40%) is more appropriate in that scenario, to avoid a significant underpayment building up that HMRC would otherwise need to collect later, potentially through a reduced tax code in a future year.
Bottom line
A BR code on a second job is a sensible starting assumption, not a guaranteed-correct one โ check both your tax codes together against your actual combined income, and proactively ask HMRC to adjust the split if your main job doesn't use your full Personal Allowance, or if combined earnings mean a D0 code would be more accurate than BR.
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Frequently asked questions
Why is my second job taxed at 20% from the first pound?
A BR (basic rate) tax code means no Personal Allowance is applied to that specific income โ every pound is taxed at 20%. HMRC typically allocates your full Personal Allowance to what it treats as your main job, leaving a second job on a BR code by default.
Is a BR code on my second job always correct?
Not necessarily โ it depends on your combined income. If your main job already uses up your full Personal Allowance and keeps you a basic-rate taxpayer, a BR code on the second job is usually correct. But if your main job is part-time or low-paid and doesn't use your full allowance, splitting the allowance between both jobs would be fairer and could mean you're currently overpaying tax.
Can I ask HMRC to split my Personal Allowance between two jobs?
Yes โ contact HMRC (or use your Personal Tax Account) and ask for your Personal Allowance to be split proportionally between your two employments if your main job doesn't use all of it, rather than leaving the whole allowance on one job and a flat BR code on the other.
What if my second job pushes my combined income into the higher-rate band?
If your combined income from both jobs takes you into higher-rate territory, a D0 code (40% flat rate, no allowance) rather than BR (20%) may be more appropriate for the second job, to avoid a large underpayment building up that would otherwise need correcting later.
Will HMRC automatically fix an incorrect two-job tax code?
Sometimes, once enough payroll data from both employers has been processed HMRC may automatically issue updated codes โ but this can lag behind your actual circumstances, so proactively checking both codes via your Personal Tax Account is more reliable than waiting for an automatic correction.
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