N means you have transferred £1,260 of your Personal Allowance to your partner using Marriage Allowance. Your tax-free income is reduced to £11,310.
Eleven thousand, three hundred and ten pounds. That is your reduced Personal Allowance when the N tax code appears on your payslip. You have transferred £1,260 of your tax-free amount to your spouse or civil partner through Marriage Allowance. Your own allowance dropped from £12,570 to £11,310, but your household is saving £252 a year in income tax as a result.
If you see the N code and your allowance appears to have shrunk, that is exactly what happened. You opted to give away part of your tax-free income to your partner. The reduction is by design, not by error.
The system works because you, as the transferor, earn below the Personal Allowance threshold. You were not using the full £12,570 anyway, so giving £1,260 of it to your partner costs you nothing in tax but saves them £252.
The arithmetic of the transfer:
| Detail | Your position (N code) | Your partner's position (M code) |
|---|---|---|
| Standard Personal Allowance | £12,570 | £12,570 |
| Marriage Allowance adjustment | -£1,260 | +£1,260 |
| Adjusted Personal Allowance | £11,310 | £13,830 |
| Tax code | 1131N | 1383M |
| Change in annual tax bill | £0 (if income under £11,310) | -£252 |
If your income is £11,310 or less, the N code has zero effect on your tax bill. You were already well within your Personal Allowance, so reducing it to £11,310 still covers all your income. You pay no tax, and your partner saves £252. This is the intended scenario: a clear household gain with no downside.
Common situations where N costs nothing:
If your income falls between £11,310 and £12,570, the N code starts to cost you money. Without the transfer, you would pay no tax (income covered by the full £12,570 allowance). With the transfer, you pay tax on the slice between £11,310 and your actual income.
Example: You earn £12,000.
| Scenario | Personal Allowance | Taxable income | Tax at 20% | Net cost/saving |
|---|---|---|---|---|
| Without N (1257L) | £12,570 | £0 | £0 | - |
| With N (1131N) | £11,310 | £690 | £138 | Cost: £138 |
| Partner's saving (M) | - | - | - | Saving: £252 |
| Net household gain | £114 |
Even in this edge case, the household still comes out ahead. Your partner saves £252, and you pay £138 more in tax, for a net gain of £114. The transfer is only a bad deal if the recipient is no longer eligible (for example, they become a higher rate taxpayer and the transfer is cancelled mid-year).
Claire earns £8,500 from her part-time job. Her husband Mark earns £34,000 as a warehouse supervisor.
Claire's tax position (1131N):
| Item | Amount |
|---|---|
| Gross income | £8,500 |
| Personal Allowance (reduced) | £11,310 |
| Taxable income | £0 (income below allowance) |
| Tax paid | £0 |
| Cost of transfer to Claire | £0 |
Mark's tax position (1383M):
| Item | Amount |
|---|---|
| Gross income | £34,000 |
| Personal Allowance (increased) | £13,830 |
| Taxable income | £20,170 |
| Tax at 20% | £4,034 |
Mark without Marriage Allowance (1257L):
| Item | Amount |
|---|---|
| Gross income | £34,000 |
| Personal Allowance (standard) | £12,570 |
| Taxable income | £21,430 |
| Tax at 20% | £4,286 |
Household saving: £4,286 - £4,034 = £252 per year. Claire pays nothing extra, Mark pays £252 less.
You applied for the transfer, so you can cancel it. There are several reasons to consider cancellation.
Your income has risen above £12,570. If you got a new job or a pay increase that takes you above the Personal Allowance, the transfer starts costing you real tax. At this point, review whether the household still gains overall.
Your partner earns above £50,270. Higher rate taxpayers are not eligible for Marriage Allowance. HMRC should catch this automatically, but it is worth checking. If your partner has moved into the higher rate band, the transfer should be cancelled.
You have separated. Marriage Allowance continues until cancelled, even after separation. The transfer remains active for the rest of the current tax year. To cancel it from the next tax year, act before 5 April.
Your partner has died. If your partner (the recipient) dies during the tax year, the transfer continues for the rest of that year. You can contact HMRC to restore your full allowance from the following year. You may also be able to claim a refund of any tax you paid due to the reduced allowance for the period after the death.
To cancel: Sign in to your Personal Tax Account at gov.uk and select "Cancel Marriage Allowance." Alternatively, call HMRC on 0300 200 3300.
If your partner applies to backdate the Marriage Allowance, HMRC may issue refunds for previous years. These backdated refunds go to the recipient (your partner), not to you. Your tax position for those previous years is not affected, because you were below the Personal Allowance anyway.
Backdating is available for up to four previous tax years. The maximum combined refund for backdated years plus the current year is £1,260 (five years at £252 each).
| Year backdated | Refund to recipient | Effect on your (N) tax position |
|---|---|---|
| 2024/25 | £252 | None (you were below PA) |
| 2023/24 | £252 | None |
| 2022/23 | £252 | None |
| 2021/22 | £252 | None |
| Total | £1,008 | No change |
If you are self-employed with low profits, you can still transfer your Marriage Allowance. The same rules apply: your total income (including self-employment profits) must be below £12,570 for the transfer to cost you nothing.
Self-employed transferors apply for Marriage Allowance in exactly the same way as employees: online at gov.uk/marriage-allowance. The difference is that HMRC does not issue a PAYE code to your employer (because you do not have one). Instead, the reduced allowance of £11,310 is reflected in your Self Assessment calculation.
If you are a sole trader earning under £1,000, you benefit from the Trading Allowance and do not need to file Self Assessment at all. You can still apply for Marriage Allowance, as the transfer is separate from Self Assessment filing obligations.
Marriage Allowance only works when one partner has unused Personal Allowance. If both partners earn above £12,570, neither has unused allowance to transfer. In this case, HMRC will reject the application, and neither the M nor N code will be issued.
| Partner A income | Partner B income | Can transfer? | Reason |
|---|---|---|---|
| £8,000 | £30,000 | Yes | Partner A has unused allowance |
| £12,570 | £12,570 | No | Neither has unused allowance |
| £15,000 | £35,000 | No | Partner A exceeds their full PA |
| £0 | £48,000 | Yes | Partner A has full unused allowance |
| £11,000 | £52,000 | No | Partner B is a higher rate taxpayer |
For couples where both partners earn above the Personal Allowance, no Marriage Allowance saving is available. The tax system treats each individual separately in this case.
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