Tax Code 1257T Explained
Your Personal Allowance is £12,579. You can earn up to this amount before paying income tax. Your tax code includes other calculations to work out your Personal Allowance — for example, it may have been reduced because your estimated annual income is over £100,000.
Updated for the 2025/26 tax year (6 April 2025 to 5 April 2026).
Code breakdown
- Tax code
- 1257T
- Personal Allowance
- £12,579
- Region
- England, Wales, or Northern Ireland
- Suffix
- T
- Suffix meaning
- Your tax code includes other calculations to work out your Personal Allowance — for example, it may have been reduced because your estimated annual income is over £100,000.
Example: £30,000 salary
Estimated take-home pay with tax code 1257T
- Gross salary
- £30,000
- Personal Allowance
- £12,579
- Taxable income
- £17,421
- Income tax
- -£3,484.2
- National Insurance
- -£1,394.4
- Annual take-home
- £25,121.4
- Monthly take-home
- £2,093.45
Why do I have tax code 1257T?
Common reasons HMRC may have issued this tax code:
- • HMRC is reviewing your tax situation
- • Your Personal Allowance has been reduced (e.g. income over £100,000)
- • There are other items that affect your allowance calculation
Think your tax code is wrong?
If tax code 1257T does not match your circumstances, you may be paying too much or too little tax. You can:
- • Check your code in your Personal Tax Account on GOV.UK
- • Contact HMRC on 0300 200 3300 (Mon-Fri, 8am-6pm)
- • Use the HMRC app to view and update your tax code