What does the tax code
1131L mean?
1131L means a £1,260 deduction from your allowance. That is exactly the Marriage Allowance transfer amount, which is why this code is so often misread.
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Get the detailed breakdown + free reclaim guideThere is a coincidence buried in this code that causes a surprising amount of confusion. 1131L and 1131N give exactly the same tax-free pay, £11,310, and cost exactly the same amount of tax. They arrive there for completely different reasons, and only one of them involves your spouse.
If your code ends in L, no allowance has been transferred to anybody. Something has been deducted from your allowance, and it happens to come to £1,260.
- 1131L Tax Code
- An ordinary L-suffix code giving £11,310 of tax-free pay for 2026/27, which is £1,260 below the standard allowance. Despite matching the Marriage Allowance transfer amount exactly, the L suffix means no allowance transfer is involved. The £1,260 is an ordinary deduction, named on your coding notice.
Why £1,260 turns up twice
The Marriage Allowance transfer is set at 10% of the standard Personal Allowance, rounded to the nearest £10. Ten per cent of £12,570 is £1,257, which rounds to £1,260. So a transferor's code becomes 1131N.
Any deduction that happens to total £1,260 produces the same number with an L. A benefit in kind valued at £1,260. An estimate of untaxed income of £1,260. An underpayment being recovered where the grossed up figure comes to £1,260. None of these has anything to do with marriage, and there is no rule preventing the coincidence.
The result is a genuinely ambiguous number distinguished only by one letter.
| Code | Tax-free pay | What it means | Who is affected |
|---|---|---|---|
| 1131N | £11,310 | You transferred £1,260 of allowance to your partner | You and your partner |
| 1131L | £11,310 | £1,260 has been deducted for an unrelated reason | You alone |
Why getting this wrong costs money
Two errors follow from misreading the suffix, and they run in opposite directions.
Reading an L as an N. You conclude a Marriage Allowance claim is running, decide it is not worth having, and go looking for something to cancel. There is nothing to cancel, and meanwhile the actual deduction, which may be a benefit that ended two years ago, goes unexamined.
Reading an N as an L. You conclude HMRC has deducted something arbitrary and start challenging a transfer you or your partner deliberately set up. Cancelling it removes £252 from your partner's pocket.
The check takes seconds. Look at the last character of your code, then look at whether your partner's code carries an M. A live Marriage Allowance claim always produces exactly one N and one M within the couple. An N with no matching M anywhere is itself worth querying.
What the £1,260 costs
| Your marginal rate | Allowance lost | Annual cost | Monthly cost |
|---|---|---|---|
| 20% basic rate | £1,260 | £252 | £21.00 |
| 40% higher rate | £1,260 | £504 | £42.00 |
The symmetry with Marriage Allowance is complete: the transfer is worth up to £252 to the recipient because £1,260 at 20% is £252. The same arithmetic applies here, just without a beneficiary.
Worked example: 1131L on a £38,000 salary
- Gross salary: £38,000
- Subtract the 1131L allowance: £38,000 minus £11,310 = £26,690 of taxable income
- All of it sits inside the basic rate band, so it is taxed at 20%
- Income tax for the year: £5,338
- Monthly tax-free pay: £11,310 divided by 12 = £942.50
On the standard 1257L code the same salary produces £25,430 taxable and £5,086 of tax. The deduction costs £252 across the year, or £21 a month. Income tax only, National Insurance excluded, and an estimate to confirm with HMRC.
What every suffix means, so this cannot happen again
The confusion this page is about comes from reading the number and skipping the letter. Since the letters are a short list, it is worth learning them once.
| Suffix or code | What it tells you |
|---|---|
| L | Standard allowance rules, no transfer, no review. The default |
| M | You received 10% of a partner's allowance under Marriage Allowance |
| N | You gave 10% of your allowance away under Marriage Allowance |
| T | Your code contains items under review, or is deliberately kept private |
| K (as a prefix) | Your deductions exceed your allowance, so there is no tax-free pay at all |
| BR | Every pound from this source taxed at the basic rate, no allowance |
| D0 | Every pound from this source taxed at the higher rate |
| D1 | Every pound from this source taxed at the additional rate |
| 0T | No allowance, but the normal bands apply as your income rises |
| NT | No tax to be deducted from this source at all |
Two rules make the whole system readable. The number, multiplied by ten, is your tax-free pay. The letter describes the basis on which that figure was arrived at. A prefix, where there is one, tells you the jurisdiction: S for Scotland and C for Wales.
Applied here: 1131 means £11,310 of tax-free pay, and L means no transfer and no review. That is the entire content of the code, and it is enough to rule out Marriage Allowance without checking anything else.
What the deduction usually turns out to be
A benefit in kind. Private medical cover, a small company car benefit, or a combination. Our 1152L page covers benefit deductions in detail.
Untaxed income. Savings interest above the Personal Savings Allowance, dividends, or modest rental profit. These are estimates and age badly.
An underpayment from an earlier year. Here the £1,260 is grossed up, so it collects about £252 of actual debt from a basic rate taxpayer. If you were told you owed roughly £250, this is very likely it, and the deduction should disappear once the debt is cleared.
A net figure. An addition of £60 and a deduction of £1,320 also produce 1131L.
The third of these has a natural end date and the others do not, which is why establishing which one you are looking at is the whole exercise.
How to check which you have
Sign in to your Personal Tax Account at gov.uk/personal-tax-account and open "Check your Income Tax". The breakdown behind your code shows each item in pounds with a description. A Marriage Allowance transfer appears explicitly as a transfer. Anything else is named for what it is.
If the deduction is recovering an underpayment, ask when it is expected to finish. Recovery deductions are meant to be temporary and are one of the few kinds that should drop out on their own. If one has been running for three years, that is a specific question to put to HMRC.
If it is a benefit that has ended, report the change in the same service or call 0300 200 3300. A corrected code applies cumulatively, so an overpayment during the current year comes back through your next payslip. Earlier years are a separate claim within the four year window, covered in our guide to reclaiming overpaid tax.
Our free tax code checker will estimate what your code should be for your circumstances so you can see the gap. It gives an estimate rather than advice.
People also ask
- 1131L gives £11,310 of tax-free pay, £1,260 below the standard allowance
- It gives exactly the same allowance as the Marriage Allowance code 1131N, but for a completely different reason
- The L suffix means no allowance has been transferred to anybody
- £1,260 appears in both because the Marriage Allowance transfer is 10% of the standard allowance rounded to the nearest £10
- The deduction costs about £252 a year at the basic rate and £504 at the higher rate
- A live Marriage Allowance claim always shows exactly one N and one M within the couple
- Recovery of an underpayment should end on its own; benefit and income estimates will not
Related tax codes: 1131N tax code | 1152L tax code | 1151L tax code | 1257L tax code | N tax code
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