The main agreement (SR and 0 1947 No.2869) has effect:
- In the United Kingdom for
i) Income Tax from 1947-48, ii) Corporation Tax from I April 1964.
- In Montserrat for the year of assessment beginning 1 January 1947.
A further agreement (SI 1968/576), amending certain provisions of the 1947 agreement, entered into force on 4 December 1968.