Since 1998, Northern Ireland has devolved government within the United Kingdom. The government and Parliament of the United Kingdom are responsible for reserved and excepted matters. Reserved matters are a list of policy areas, which the Westminster Parliament may devolve to the Northern Ireland Assembly at some time in future. Excepted matters are never expected to be considered for devolution. On all other matters, the Northern Ireland Executive together with the 90-member Northern Ireland Assembly may legislate and govern for Northern Ireland. Additionally, devolution in Northern Ireland is dependent upon participation by members of the Northern Ireland Executive in the North/South Ministerial Council, which co-ordinates areas of co-operation between Northern Ireland and the Republic of Ireland.

Ulster nationalism is a minor school of thought in the politics of Northern Ireland that seeks the independence of Northern Ireland from the United Kingdom without joining the Republic of Ireland, thereby becoming an independent sovereign state separate from both.