Tax Code 1383M Explained
Your Personal Allowance is £13,830. You can earn up to this amount before paying income tax. You receive Marriage Allowance transferred by your spouse or civil partner. The numeric part reflects the transfer together with any other HMRC adjustments.
Updated for the 2026/27 tax year (6 April 2026 to 5 April 2027).
Code breakdown
- Tax code
- 1383M
- Personal Allowance
- £13,830
- Region
- England, Wales, or Northern Ireland
- Suffix
- M
- Suffix meaning
- You receive Marriage Allowance transferred by your spouse or civil partner. The numeric part reflects the transfer together with any other HMRC adjustments.
Example: £30,000 salary
Estimated take-home pay with tax code 1383M
- Gross salary
- £30,000
- Personal Allowance
- £13,830
- Taxable income
- £16,170
- Income tax
- -£3,234
- National Insurance
- -£1,394.4
- Annual take-home
- £25,371.6
- Monthly take-home
- £2,114.3
Why do I have tax code 1383M?
Common reasons HMRC may have issued this tax code:
- • Your spouse or civil partner transferred £1,260 of their Personal Allowance to you
- • You applied for Marriage Allowance and HMRC approved it
- • Your partner earns less than the Personal Allowance and chose to share it
Think your tax code is wrong?
If tax code 1383M 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
How UK Tax Codes Work
Your tax code tells your employer or pension provider how much tax-free income you are entitled to in the current tax year. HMRC assigns your tax code based on your Personal Allowance, any taxable benefits, untaxed income, or adjustments from previous years. The numbers in your tax code represent your tax-free amount divided by 10, and the letters indicate your situation. For example, 1257L means a Personal Allowance of £12,570 with the standard suffix. If your code changes, your employer adjusts your tax deductions automatically. You can check and update your tax code through your Personal Tax Account on GOV.UK.
Tax codes are issued by HMRC at the start of each tax year and can change during the year if your circumstances change. Common reasons for a tax code change include starting a new job, receiving benefits in kind such as a company car, or having your Personal Allowance reduced because your income exceeds £100,000. If you have multiple jobs, each employer receives a separate tax code. Your primary employer normally receives your full Personal Allowance via a code like 1257L, while secondary employers typically receive a BR (basic rate) or D0 (higher rate) code meaning all income from that source is taxed at the relevant rate with no allowance.
If you live in Scotland, your tax code will start with an S prefix (for example S1257L), and if you live in Wales it will start with a C prefix (for example C1257L). These prefixes tell your employer to apply Scottish or Welsh income tax rates instead of the standard England and Northern Ireland rates. The Personal Allowance amount remains the same regardless of which country you live in within the UK.