Revenue stamps of Northern Ireland
Upon the partition of Ireland in 1921, separate revenue stamps began to be issued for both Northern Ireland and Southern Ireland. The latter were withdrawn soon afterwards upon the establishment of the Provisional Government, but the former continued to issue revenue stamps until the late 20th century. The need for separate issues for Northern Ireland came about since taxes raised there were meant to remain in the country. Most Northern Irish revenue stamps were British key types with appropriate inscriptions, but there were a number of different issues as well.
Civil Authorities (Special Powers) Act (Northern Ireland) 1922
Partition was formally established with the Government of Ireland Act 1920. This also established the Parliament of Northern Ireland, which came into being the following year. Partition was followed by high levels of inter-communal violence, especially in Belfast. The Irish Republican Army, although it spent most of these years fighting in the Irish Civil War, aimed to use armed force to end partition and compel the United Kingdom to withdraw sovereignty from Northern Ireland.