What does the D0 tax code mean?
D0 means: D0: all of this income is taxed at the higher rate (40%). Used for a second income when your main job already uses your bands. In short: all income taxed at higher rate. A UK tax code is the instruction HMRC sends your employer for the 2026/27 tax year (6 April 2026 to 5 April 2027): it sets how much of your pay is tax-free before income tax is deducted through PAYE, so the code on your payslip directly decides your take-home. The standard code for most employees with one job is 1257L, worth £12,570 of tax-free income a year, any other code should have a reason behind it (a company benefit, a second job, an HMRC adjustment), and a code that's wrong for your situation means paying the wrong tax every single payday until it's fixed. Decoded below against HMRC's rules as checked on 2026-08-28, with what D0costs or saves against the standard code.
Decoded
On a £32,000 salary, D0 deducts roughly £8,914.00 more income tax per year than the standard 1257L code, £742.83 a month. If this is your only job and nothing explains the code, that is money to reclaim.
Check your own code
Type any code, this page's and every other format HMRC issues:
Tax-free allowance of about £12,570.00 a year.
- L: you get the standard personal allowance.
Other codes people look up
2026/27 rules, checked 2026-08-28. If your code looks wrong, correct it via your personal tax account on gov.uk, refunds for the current year arrive through your pay automatically.