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 | 400L | 600L |
|---|---|---|
| Category | Standard | Standard |
| Region | rUK | rUK |
| Allowance | £4,000 | £6,000 |
| Emergency / non-cumulative | No | No |
| Approx. annual tax on £30k | £5,200 | £4,800 |
| In one sentence | Reduced allowance of £4,000 - usually because of benefits-in-kind, an underpayment, or a P11D adjustment. | Reduced allowance of £6,000 - usually because of benefits-in-kind, an underpayment, or a P11D adjustment. |
Bottom line on £30k
On a £30,000 salary, 400L deducts roughly £5,200 in income tax per year vs £4,800 for 600L. That is a difference of £400 per year - 400L is more expensive.
Hand-picked side-by-sides that answer the most-searched UK tax-code questions.
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