Tax Code CD0 Explained
CD0 is the Welsh equivalent of the D0 tax code — all income from this source is taxed at a flat 40% higher rate, with no Personal Allowance applied. The C prefix confirms the taxpayer is a Welsh resident. Since Welsh Income Tax rates match England rates for 2025-26, the take-home pay on CD0 is identical to D0. It is used when additional income falls into the higher rate band because the basic rate band is already used by the primary income source.
Who gets tax code CD0?
Welsh residents with a second job or income source whose main employment already fills the entire basic rate band (up to £50,270). Every pound from the secondary source goes straight into the 40% higher rate band. The C prefix ensures HMRC accounts for this income as Welsh Rate of Income Tax.
Welsh Income Tax (WRIT): Wales sets its own income tax rates via the Senedd (Welsh Parliament). For 2025-26, Welsh Rates of Income Tax are identical to England: Basic Rate 20% (£12,571–£50,270), Higher Rate 40% (£50,271–£125,140), Additional Rate 45% (above £125,140). Take-home pay is the same as the equivalent English tax code. National Insurance is the same across all UK regions.
Take-home pay on tax code CD0 — Wales 2025-26 examples
Examples below show Welsh Income Tax and take-home pay at common salary levels. Results are identical to the equivalent English code for 2025-26.
| Gross Salary | Welsh IT | NI (est.) | Take-Home | Effective IT Rate |
|---|---|---|---|---|
| £20,000 | £8,000 | £594 | £11,406 | 40.0% |
| £25,000 | £10,000 | £994 | £14,006 | 40.0% |
| £30,000 | £12,000 | £1,394 | £16,606 | 40.0% |
| £35,000 | £14,000 | £1,794 | £19,206 | 40.0% |
| £40,000 | £16,000 | £2,194 | £21,806 | 40.0% |
| £45,000 | £18,000 | £2,594 | £24,406 | 40.0% |
| £50,000 | £20,000 | £2,994 | £27,006 | 40.0% |
| £60,000 | £24,000 | £3,211 | £32,789 | 40.0% |
| £75,000 | £30,000 | £3,511 | £41,489 | 40.0% |
| £100,000 | £40,000 | £4,011 | £55,989 | 40.0% |
Take-home = Gross − Welsh Income Tax − National Insurance. No pension, student loan or other deductions. NI: 8% between £12,570–£50,270 and 2% above.
Welsh income tax rates 2025-26
| Band | Rate | Income range |
|---|---|---|
| Basic Rate | 20% | £12,571 – £50,270 |
| Higher Rate | 40% | £50,271 – £125,140 |
| Additional Rate | 45% | £125,141 – no upper limit |
If you have tax code CD0, here's what you should know
- Your C-prefix tax code confirms you are coded as a Welsh resident for income tax purposes. HMRC uses your residential address to determine this.
- Your employer uses this code to deduct Welsh Income Tax — they follow HMRC's instructions and cannot change your code themselves.
- If you have recently moved to or from Wales, contact HMRC to ensure your code is updated. An incorrect residence determination means your tax revenue goes to the wrong devolved budget.
- You can view and update your tax code via your Personal Tax Account at gov.uk.
- If you think your code is wrong, contact HMRC on 0300 200 3300 or use the HMRC app.
Frequently asked questions
What does tax code CD0 mean?
CD0 is the Welsh equivalent of the D0 tax code — all income from this source is taxed at a flat 40% higher rate, with no Personal Allowance applied. The C prefix confirms the taxpayer is a Welsh resident. Since Welsh Income Tax rates match England rates for 2025-26, the take-home pay on CD0 is identical to D0. It is used when additional income falls into the higher rate band because the basic rate band is already used by the primary income source.
Who gets tax code CD0?
Welsh residents with a second job or income source whose main employment already fills the entire basic rate band (up to £50,270). Every pound from the secondary source goes straight into the 40% higher rate band. The C prefix ensures HMRC accounts for this income as Welsh Rate of Income Tax.
How much do I take home on tax code CD0 earning £30,000 in Wales?
On tax code CD0 with a £30,000 salary in Wales, you take home £16,606 per year (£1,384 per month) after Income Tax of £12,000. Welsh Rates of Income Tax are identical to England for 2025-26, so take-home pay is the same as for the equivalent English code.
Is tax code CD0 correct for me?
Your Welsh tax code is set by HMRC based on your individual circumstances and Welsh residence. If you believe your code is wrong, contact HMRC on 0300 200 3300 or check your Personal Tax Account at gov.uk. An incorrect code could mean you are paying too much or too little Income Tax.
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