The Double Taxation Convention as amended by protocols signed on 15 April 1980, 16 October 1985 and 7 May 2003, is effective in Canada from 1 January 1976.
The convention is effective in the UK for:
Petroleum Revenue Tax for any chargeable period on or before 1 January 1976
Corporation Tax for any financial year beginning on or after 1 April 1976
Income Tax and Capital Gains Tax for any year of assessment beginning on or after 6 April 1976
development land tax for any realised development value accruing on or after 1 August 1976
The 2015 exchange of notes on arbitration was signed on 11 August 2015, entered into force on 21 December 2016 and takes effect in the UK and Canada from that date. The arrangements set out in the 2015 Exchange of Notes add extra rules to the provisions on arbitration that were inserted into the Canada - UK Double Taxation Convention by the 2014 protocol.