Tax Code 580T Explained
T code — Personal Allowance is £5,800, typically applied when HMRC needs to review your allowance (e.g. high-income PA taper, split allowances, other adjustments).
At a glance — 580T
- Personal Allowance
- £5,800
- Region
- UK-wide (rUK / Wales)
- Cumulative?
- Yes
- Code type
- T suffix (review)
What does 580T mean?
HMRC needs to review your tax code. This may be because your Personal Allowance includes other calculations to work out your code.
Your tax-free Personal Allowance is £5,800.
How much tax will you pay on 580T?
Annual income tax HMRC would deduct on 2025-26 rates for a range of salaries, assuming the full year on this code. National Insurance is additional and the same across the UK.
| Annual salary | England / Wales / NI — income tax | Effective rate | Take-home (pre-NI) |
|---|---|---|---|
| £20,000 | £2,840 | 14.2% | £17,160 |
| £30,000 | £4,840 | 16.1% | £25,160 |
| £50,000 | £10,140 | 20.3% | £39,860 |
| £80,000 | £22,140 | 27.7% | £57,860 |
| £100,000 | £30,140 | 30.1% | £69,860 |
For Scottish / rUK side-by-side, or to model your own salary, student loan and pension contributions, use the tax code checker.
Should you be on tax code 580T?
Related tax codes
0T — No Allowance
No Personal Allowance — typically assigned when HMRC does not have enough information. Income taxed from £0 through normal bands.
1257L — Standard
The default HMRC tax code for most UK employees — gives you the full £12,570 tax-free Personal Allowance.
S1257L — Scottish Standard
The Scottish version of the standard code. Same £12,570 allowance, but Scottish tax bands (19% / 20% / 21% / 42% / 45% / 48%) apply.
C1257L — Welsh Standard
The Welsh version of the standard code. Full £12,570 allowance with Welsh (rUK-aligned) rates.
Check your own code: enter any HMRC tax code into the free tax code checker — it decodes the letters and number, shows your Personal Allowance, and estimates your take-home using 2025-26 or 2026-27 rates.
For the full plain-English guide to every UK tax code letter, prefix and suffix, see UK Tax Codes Explained 2026-27.
Sources
Tax code rules from gov.uk/tax-codes. Income tax rates from HMRC. Effective tax figures computed live from central configuration — correct for 2025-26.