Taxpayers who do not receive a self-assessment tax return to complete must notify HMRC by 5 October if they had income or capital gains in the previous tax year on which further tax is due.
Deadline for second payment on account for tax year ended 5 April 2018.
New fuel rates come into force.
National living wage increases from £7.50 to £7.83 an hour for over-25s.
The tax-free dividend allowance reduces from £5,000 to £2,000.