What Does Tax Code 1257L Mean? UK Tax Codes Explained (2026/27)

If you check your payslip, you will almost certainly see a short alphanumeric code like 1257L. This is your Tax Code, and it tells your employer or pension provider exactly how much Income Tax to deduct before paying you.

For the 2026/27 tax year, 1257L remains the standard tax code for most employees with a single job in England, Wales, and Northern Ireland (or S1257L in Scotland).

Breaking Down "1257L"

• The Number (1257): This represents your annual tax-free Personal Allowance. Multiply by 10 (or add a zero to the end) to get £12,570. This is the amount of income you can earn each tax year completely tax-free.
• The Letter (L): This indicates that you are entitled to the standard Personal Allowance.

Worked Example:

If your gross salary is £30,000 per year:

1. Tax-Free Allowance: The first £12,570 is tax-free.
2. Taxable Pay: You only pay Income Tax on the remaining £17,430 (£30,000 - £12,570).
3. Basic Rate Tax (20%): 20% of £17,430 = £3,486 per year (£290.50 per month).

Other Common UK Tax Codes

BR (Basic Rate)

All your income from this job or pension is taxed at the flat basic rate of 20%, with no tax-free Personal Allowance applied.

• When is it used? Most commonly on a second job or pension when your primary employment already uses your full £12,570 allowance.

D0 (Higher Rate) & D1 (Additional Rate)

• D0: All income is taxed at the Higher Rate (40% in England/NI/Wales; 42% in Scotland). Common for high-earning second jobs.
• D1: All income is taxed at the Additional Rate (45% in England/NI/Wales; 48% in Scotland).

K Codes (e.g., K450 or K100)

Used when your taxable deductions exceed your Personal Allowance, effectively creating "negative tax-free pay".

• Why? Common if you have company benefits (like a company car, private healthcare) or unpaid tax from a prior year worth more than £12,570. The number indicates how much additional taxable income is added to your earnings.

M and N (Marriage Allowance)

• M: You have received 10% of your spouse or civil partner's Personal Allowance (an extra £1,260 tax-free).
• N: You have transferred 10% of your allowance to your partner.

NT (No Tax)

No Income Tax is deducted from this income source.

Scottish Tax Codes (Prefix 'S')

If your main residence is in Scotland, your tax code is prefixed with an S (e.g., S1257L, SBR, SD0). This instructs your payroll to deduct tax according to Scottish Income Tax bands (Starter 19%, Basic 20%, Intermediate 21%, Higher 42%, Advanced 45%, Top 48%).

Welsh Tax Codes (Prefix 'C')

If you live in Wales, your code starts with C (e.g., C1257L), reflecting Welsh Rates of Income Tax.

How to Check Your Tax Code

You can verify your current tax code in three places:

1. Your payslip: Listed near your National Insurance number and pay period.
2. Your P60 or P45: Your annual summary or leaving certificate.
3. Your HMRC Personal Tax Account: Log in via GOV.UK or the official HMRC app.

Important Tip: If you notice an emergency code (like 1257 W1, 1257 M1, or 1257 X) or suspect your code is incorrect, contact HMRC immediately via GOV.UK. You could be overpaying hundreds of pounds in tax every month.

Calculate Your Exact Take-Home Pay

To see how your tax code affects your monthly take-home pay, use our Salary Calculator and open Advanced Options to enter your exact tax code.