The tax information exchange agreements with Jersey and Guernsey entered into force on 27 November 2009.
The provisions of the arrangements will take effect in Jersey and Guernsey from 1 January 2010 and will take effect in the UK from 1 April 2010 for the purposes of Corporation Tax, and from 6 April 2010 for Income Tax purposes.
For further details on the Jersey agreement click here
For further details on the Guernsey agreement click here