The standard tax code for your first job in the UK is 1257L. It tells your employer that you’re entitled to the full £12,570 Personal Allowance before any income tax is deducted through PAYE. The “1257” is your tax-free allowance with the last digit dropped, and the “L” confirms you qualify for the standard amount with no adjustments.1GOV.UK. What Your Tax Code Means
Your employer spreads that allowance evenly across your pay periods. Paid monthly, you get roughly £1,047 tax-free each month. Paid weekly, it’s about £242. Only earnings above that threshold are taxed, and for most first-time workers the only rate that applies is the basic rate of 20% on income between £12,571 and £50,270.2GOV.UK. Income Tax Rates and Personal Allowances The Personal Allowance has been frozen at £12,570 since April 2021 and stays at that level through at least the 2026–27 tax year.
If You Live in Scotland or Wales
The allowance is the same across the UK, but your code carries a country prefix. Scottish taxpayers get S1257L, and Welsh taxpayers get C1257L. The prefix tells your employer which country’s tax rates to apply; the underlying £12,570 doesn’t change.3GOV.UK. Income Tax in Scotland – Who Pays
Scotland runs six tax bands rather than three, starting with a 19% starter rate on the first £2,827 above the Personal Allowance and climbing to 48% at the top. Wales has the power to set different rates but has kept them aligned with England and Northern Ireland.4GOV.UK. Income Tax in Scotland – Current Rates HMRC updates your prefix automatically based on where you live on 5 April.
What Your Employer Needs From You
Two things determine whether you end up on 1257L from day one: your National Insurance number and a completed Starter Checklist.
Your National Insurance number is a nine-character code (two letters, six numbers, a final letter) that stays with you for life. If you grew up in the UK, you should have received it by letter shortly before your 16th birthday. If you never got one or have lost the letter, you can apply online through GOV.UK; the application takes up to four weeks and may require photo ID.5GOV.UK. Apply for a National Insurance Number – How to Apply You can start work without it, but sorting it quickly prevents HMRC from failing to match your payments to your record.
If you’ve never had a job before, you won’t have a P45 from a previous employer. Instead, you complete a Starter Checklist, which gives HMRC the information it needs to assign your code.6GOV.UK. Starter Checklist if You’re Starting a New Job
Choosing the Right Statement on the Starter Checklist
The checklist asks for your name, address, date of birth, and NI number. The section that decides your tax code is the employment statement, where you pick one of three options:7HM Revenue and Customs. Starter Checklist
- Statement A: this is your first job since 6 April and you haven’t received Jobseeker’s Allowance, Employment and Support Allowance, or Incapacity Benefit since that date. Most first-time workers should pick this.
- Statement B: you’ve had another job since 6 April but don’t have a P45, or you’ve received one of the benefits listed above.
- Statement C: you have another job running at the same time, or you’re receiving a state, workplace, or private pension.
Pick Statement A and your employer will apply the full 1257L code and your entire Personal Allowance. Pick B or C when A actually applies and you won’t cause permanent harm, but you’ll likely have too much tax taken from your early payslips until it’s corrected.
The checklist also asks about student loans. If you have one, you specify which plan you’re on so repayments can start once your earnings cross the threshold. If you haven’t attended university, skip that section.
How to Spot an Emergency Tax Code
If your employer doesn’t have your details or you haven’t submitted a Starter Checklist, HMRC assigns a temporary emergency code. This is the most common source of overpaid tax for new workers.8GOV.UK. Emergency Tax Codes
- 1257L W1, 1257L M1, or 1257L X: you still get the Personal Allowance, but tax is calculated on each pay period in isolation rather than cumulatively across the year. W1 appears on weekly payslips, M1 on monthly ones, and X where pay dates vary. The system can’t account for months when you earned less or didn’t work, so it can’t spread your allowance properly.
- BR: all your income from this job is taxed at 20% with no Personal Allowance applied. HMRC usually assigns this when it thinks you have another job already using your allowance.
- 0T: your Personal Allowance has been used up or HMRC doesn’t have the details needed to assign a proper code. You’re taxed on every pound.
BR and 0T hurt the most on a first payslip because they strip your tax-free amount entirely. If you see either and you don’t have another job, something has gone wrong in the paperwork.
Fixing a Wrong Code and Getting a Refund
Your first stop is your Personal Tax Account on GOV.UK. Sign in (or set one up using photo ID like a passport or driving licence) and open “Check your Income Tax.” From there you can see your current code and update your employment details to prompt HMRC to issue a corrected one.9GOV.UK. Personal Tax Account – Sign In or Set Up
You can also call the Income Tax helpline on 0300 200 3300, Monday to Friday, 8am to 6pm, and speak to someone who can review your records directly.10GOV.UK. Income Tax – Enquiries Once HMRC agrees your code needs changing, it sends a P6 coding notice to your employer’s payroll department, and the update typically takes one to two pay cycles to show up on your payslip.11GOV.UK. Understanding Your Employees Tax Codes – Changes During the Tax Year
Overpaid tax from an emergency code usually sorts itself out. Once your correct code is in place, your employer’s payroll recalculates your tax on a cumulative basis for the year, and the extra you paid comes back through a larger-than-expected payslip. You don’t typically have to wait until the end of the tax year. If the emergency code persists for several months, contact HMRC directly. After the tax year ends on 5 April, HMRC reconciles what you paid against what you owed and issues a refund if there’s a difference.
Don’t wait for payroll to notice. They process whatever code HMRC sends and have no way of knowing yours is wrong. Check your first payslip: if the code isn’t 1257L (or S1257L in Scotland, C1257L in Wales), start the fix that week.