Council Tax Band I in Wales \u2014 The Highest Band Explained
Updated: April 2026
What Is Band I?
Band I is the highest council tax band in Wales and is unique to the Welsh system \u2014 England and Scotland do not have it. It was introduced during the 2005 revaluation to provide a fairer spread at the top end of the property market. Band I covers properties that were valued at more than \u00A3424,000 as of 1 April 2003.
How Many Properties Are in Band I?
Band I is relatively rare. Only a small percentage of Welsh properties fall into this band \u2014 primarily large detached houses in affluent areas such as parts of Cardiff, the Vale of Glamorgan, Monmouthshire, and Powys. If your property is in Band I, you pay the highest council tax rate in your local authority area.
Is Your Band I Correct?
Because Band I covers a wide range (everything above \u00A3424,000), there is less room for error at this level. However, if your property was close to the \u00A3424,000 boundary in 2003, it may have been incorrectly placed in Band I when it should be Band H. Use our free checker to compare your property with neighbours.
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