The devolution settlements for Scotland, Northern Ireland and Wales are each unique. Areas that are devolved in one part of the UK may not be devolved in another. This reflects the history and development of the different devolution settlements across the UK. Powers are devolved to the Northern Ireland Assembly but not to the Scottish Parliament in the following areas:
- Energy production and supply
- Employment law
- All social security (some elements of social security are devolved in Scotland)
- Child support
- Equal opportunities (equal opportunities in relation to public bodies is devolved in Scotland)
- Time (for example timescales, time zones and the subject-matter of the Summer Time Act 1972)
There are also powers which are devolved to the Scottish Parliament and not to the Northern Ireland Assembly, including stamp duty, Landfill tax, management of Crown Estate assets and some income tax.