Band I Council Tax 2026/27
2003 value: Over £424,000
Fraction of Band D: 21/9
Wales avg rate (est.)
£5,326.00
per year, Band D avg
Multiplier
21/9
of Band D rate
Value range
Over £424,000
2003 Wales values
What is Band I?
Band I exists only in Wales. It was created as part of the 2003 Welsh revaluation to capture properties valued at over £424,000 at 1 April 2003 prices. Band I households pay 21/9 of the Band D rate - more than double the Band D rate. There is no Band I in England or Scotland.
Typical property types in Band I: High-value Welsh properties: substantial country houses, coastal properties in premium locations, and larger detached homes in the most expensive Welsh postcodes. Primarily found in parts of Cardiff, the Vale of Glamorgan, Monmouthshire, and Gwynedd.
How Band I Rates Are Calculated
Your Band I council tax bill is calculated by multiplying your council's Band D rate by 21/9. The Band D rate is set by your local authority each year in February or March. You cannot negotiate the fraction - it is set by central government.
Formula
Your council's Band D rate × 21/9 = Band I rate
Example: £2,392 (England average Band D) × 21/9 = £5,581.00 per year
Band I Rates by Council 2026/27
| Council | Band I rate |
|---|---|
| Cardiff Council | £4,697.42 |
| Isle of Anglesey County Council | £5,275.04 |
| City and County of Swansea | £5,222.68 |
| Newport City Council | £4,873.12 |
| Wrexham County Borough Council | £5,387.39 |
| Rhondda Cynon Taf County Borough Council | £5,342.00 |
| Bridgend County Borough Council | £5,781.98 |
| Caerphilly County Borough Council | £4,860.05 |
Showing 8 councils. All councils available on their individual pages. Browse all councils.
Band I Council Tax: Common Questions
How much is council tax Band I in 2026/27?
Band I exists only in Wales. Based on the average Welsh Band D of £2,283.00 for 2026/27, a typical Band I bill is about £5,326.00 per year (21/9 of Band D). Your exact bill is set by your Welsh council.
How much is council tax Band I per month?
Band I exists only in Wales. A typical Band I bill of about £5,326.00 a year (on the average Welsh Band D of £2,283.00 for 2026/27) works out at roughly £533.00 a month, because councils normally collect council tax in 10 monthly instalments from April to January. You can ask your Welsh council to spread the same amount over 12 instalments instead. Your exact figure depends on the Band D rate your council sets.
What is council tax Band I?
Band I exists only in Wales. It was created as part of the 2003 Welsh revaluation to capture properties valued at over £424,000 at 1 April 2003 prices. Band I households pay 21/9 of the Band D rate - more than double the Band D rate. There is no Band I in England or Scotland.
How is Band I council tax calculated?
Band I is 21/9 of your council's Band D rate, a fraction fixed by central government that you cannot negotiate. Your council sets the Band D rate each year in February or March, then every band is worked out from it.
Updated April 2026. Band I rates from 1 April 2026. Rates vary by council.