Pick any two UK PAYE tax codes and we will line up the allowance, emergency status, region and approximate annual tax on a £30,000 salary so you can see exactly how they differ.
Last updated 2026-04-12
| Attribute | 1383L | 1257L-NI |
|---|---|---|
| Category | Marriage | Standard |
| Region | rUK | NorthernIreland |
| Allowance | £13,830 | £12,570 |
| Emergency / non-cumulative | No | No |
| Approx. annual tax on £30k | £3,234 | £3,486 |
| In one sentence | Increased allowance of £13,830 (typically Marriage Allowance recipient). | Northern Ireland uses the same PAYE codes as England - there is no NI-specific prefix. |
Bottom line on £30k
On a £30,000 salary, 1383L deducts roughly £3,234 in income tax per year vs £3,486 for 1257L-NI. That is a difference of £252 per year - 1383L is less expensive.
Hand-picked side-by-sides that answer the most-searched UK tax-code questions.
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