There will be various changes to pay, tax, National Insurance and pensions all taking effect from April. The most relevant ones are -
1. Minimum Wage - From 1st April 2018 the hourly rate will rise to £7.83 for those aged 25+. For 21-24 year olds it will be £7.38. For 18-20's it will be £5.90 and £4.20 for 16-17 year olds. The apprentice rate will be £3.70.
2. Tax codes will change from 6th April. For 2018/19 L codes will increase by 35, M codes by 39 and N codes by 31. The personal allowance will be £11,850, giving a basic tax code of 1185L.
3. Also from 6th April the National Insurance Primary Threshold will be £8,424 per year (or £702 per month / £162 per week).
4. Minimum pension contributions under automatic enrolment also increase from 6th April to 5% (3% employees and 2% employers).