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 | 1100T | 1257L W1 |
|---|---|---|
| Category | Standard | Emergency |
| Region | rUK | rUK |
| Allowance | £11,000 | £12,570 |
| Emergency / non-cumulative | No | Yes |
| Approx. annual tax on £30k | £3,800 | £3,486 |
| In one sentence | Reduced allowance with HMRC-review marker. | Standard personal allowance of £12,570 for England, Wales and NI. on a non-cumulative (W1) basis. |
Bottom line on £30k
On a £30,000 salary, 1100T deducts roughly £3,800 in income tax per year vs £3,486 for 1257L W1. That is a difference of £314 per year - 1100T is more expensive.
Hand-picked side-by-sides that answer the most-searched UK tax-code questions.
Upload your payslip and we will tell you whether the code being applied is correct for the pay you actually received.
Check My Payslip