06 Apr 2018
National living wage
National living wage increases from £7.50 to £7.83 an hour for over-25s.
Higher-rate income tax threshold increases from £45,000 to £46,350.
Land transaction tax (Wales)
Wales assumes responsibility for setting its own land transaction tax rates in place of stamp duty land tax.
Marriage allowance rises to £1,185.
Capital gains tax allowances
Capital gains tax annual allowance for individuals increases to £11,700; and to £5,850 for trustees.
Lifetime pension allowance
Lifetime pension allowance increases to £1.03 million.
Start of new tax year
Start of new tax year.
Annual junior ISA limit rises to £4,260.
Personal allowance increases from £11,500 to £11,850.
01 Apr 2018
Measure of business rates changes
All future business rates are now determined by the Consumer Prices Index measure of inflation.
Corporation tax payment
Corporation tax payment due for year end 30 June 2017, for those companies not liable to pay their liability by instalments.
31 Mar 2018
Disincorporation relief ends
Government will not extend disincorporation relief beyond the 31 March 2018 expiry date.
Company accounts filing deadline
Deadline for filing your company tax return is 12 months after your accounting period for corporation tax ends.
End of corporation tax financial year.
End of CT61 quarterly period.
Corporation tax return
Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 March 2017 to be submitted to HMRC.
22 Mar 2018
Monthly electronic PAYE/class 1 NICs/student loan payment
If paying electronically, pay PAYE, class 1 NICs, student loan deductions and deductions from payments to subcontractors for the month up to the 5th of this month.
21 Mar 2018
EC sales list
Deadline for online monthly or quarterly return filing.
Due date for payment of supplementary declarations for February 2018.
19 Mar 2018
Construction Industry Scheme: monthly return due for period up to 5th of previous month.