The 1275L tax code tells your employer or pension provider to treat £12,750 of your income as tax-free this year. That is £180 more than the standard Personal Allowance of £12,570, and the extra almost always reflects a small work-related tax relief that HMRC has folded into your code so you feel the benefit in every paycheck rather than waiting for a refund.
What the Number and Letter Mean
Every PAYE tax code has a number and a letter. The number is your annual tax-free amount with the final digit removed, so 1275 stands for £12,750. The L confirms you are entitled to the standard Personal Allowance with no unusual status such as a Marriage Allowance transfer or Scottish or Welsh residency added on top.1GOV.UK. Understanding Your Employees’ Tax Codes – What the Letters Mean
Your payroll software spreads that £12,750 across the year. On monthly pay, roughly £1,062.50 is free of tax each month. On weekly pay, about £245.19. Anything above that is taxed at the rate that applies to your total income.
For comparison, the most common code in 2025/26 is 1257L, matching the £12,570 Personal Allowance that has been frozen since 2021/22.2GOV.UK. Income Tax Rates and Personal Allowances If you see 1275L instead, HMRC has adjusted your allowance upward by £180. If you see S1275L or C1275L, the allowance is the same, but Scottish or Welsh rates apply to income above it.
Where the Extra £180 Comes From
The most common source is a combination of flat-rate job expenses. HMRC lets workers in many occupations claim a fixed annual deduction for washing, repairing, or replacing uniforms and work clothing. The default is £60 a year, though some roles qualify for more.3GOV.UK. Check How Much Tax Relief You Can Claim for Uniforms, Work Clothing and Tools If you also pay a professional subscription that HMRC recognises as necessary for your job, the fee is added to your allowance.4GOV.UK. Claim Tax Relief for Your Job Expenses – Professional Fees and Subscriptions A £60 uniform allowance plus a £120 annual membership produces exactly £180.
Other reliefs can push a code up too, including a working-from-home allowance worth up to £6 a week, mileage, or tool costs, though these typically produce different code numbers.5GOV.UK. Claim Tax Relief for Your Job Expenses – Working from Home If you are not sure which reliefs make up your £180, the P2 coding notice HMRC sends when your code changes breaks down every component.
How to Check Whether 1275L Is Right for You
The quickest check is through HMRC’s “Check your Income Tax” service or the HMRC app. Both show a breakdown of exactly which allowances and deductions were used to build your code.6GOV.UK. Check Your Income Tax for the Current Year This is the moment to ask whether the reasons for the £180 still apply. If you claimed a uniform allowance in an old job and your current role has no uniform, that £60 should not be there. If you cancelled a professional membership, the same is true.
Cross-reference the code with your paperwork. Your P60 confirms total pay and tax for the year, your P45 records earnings and tax up to the date you left a previous job, and a P11D lists benefits in kind such as a company car or private medical insurance that reduce your tax-free amount.7GOV.UK. Your P45, P60 and P11D Form If any of those figures do not line up with what HMRC used to calculate 1275L, you have found the error.
One boundary worth knowing: if your adjusted net income is above £100,000, your Personal Allowance shrinks by £1 for every £2 over that threshold and disappears at £125,140. At that income level you would not usually be on any L code at all, so if you are earning in that range and still see 1275L, contact HMRC.2GOV.UK. Income Tax Rates and Personal Allowances
Keep receipts for any subscriptions or uniform costs behind the £180. If HMRC queries the adjustment, those records are your proof.
Fixing a Wrong Code
You can update your details through the same online service or app used to check the code. It lets you correct your estimated income, add or remove employment expenses, and flag changes to benefits in kind.6GOV.UK. Check Your Income Tax for the Current Year If you would rather write, the address is Pay As You Earn and Self Assessment, HM Revenue and Customs, BX9 1AS, United Kingdom. Include your National Insurance number and say clearly what you believe is wrong.8HM Revenue & Customs. Income Tax – Enquiries
When HMRC agrees a change is needed, they issue a P2 coding notice showing the updated code with a full arithmetic breakdown of every component.9GOV.UK. How They Are Used and Calculated – P2 Notice of Coding They also send a separate instruction to your employer so payroll picks up the new figures for future pay.
If You’ve Overpaid or Underpaid
Time spent on the wrong code means you have either overpaid or underpaid tax. After the tax year ends on 5 April, HMRC reviews PAYE records and sends a P800 calculation letter if there is a discrepancy.10GOV.UK. Tax Overpayments and Underpayments If you have overpaid, the letter explains how to claim the refund, usually online, with the money arriving within five to six weeks. If you have underpaid, HMRC generally collects the shortfall by adjusting next year’s code so the repayment spreads across future paychecks instead of arriving as a lump sum.
Do not wait for a P800 if you already know something is wrong. Correcting your code mid-year means your employer adjusts remaining paychecks to settle the earlier over- or underpayment, which is faster than waiting for the year-end reconciliation. If you believe you have overpaid and no P800 has arrived, you can claim directly through your personal tax account. HMRC generally allows claims going back four tax years, so it is worth checking older years if you think the error has been running for a while.