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Tax and business calendar

Details of compliance and regulatory deadlines.

To see expired deadlines, please use the following link: Expired deadlines

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31 Mar 2018

  • Corporation tax return

    Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 March 2017 to be submitted to HMRC.

  • CT61

    End of CT61 quarterly period.

  • Corporation tax

    End of corporation tax financial year.

  • Company accounts filing deadline

    Deadline for filing your company tax return is 12 months after your accounting period for corporation tax ends.

  • Disincorporation relief ends

    Government will not extend disincorporation relief beyond the 31 March 2018 expiry date.

01 Apr 2018

  • Corporation tax payment

    Corporation tax payment due for year end 30 June 2017, for those companies not liable to pay their liability by instalments.

  • Measure of business rates changes

    All future business rates are now determined by the Consumer Prices Index measure of inflation.

06 Apr 2018

  • Personal allowance

    Personal allowance increases from £11,500 to £11,850.

  • Junior ISA

    Annual junior ISA limit rises to £4,260.

  • Start of new tax year

    Start of new tax year.

  • Lifetime pension allowance

    Lifetime pension allowance increases to £1.03 million.

  • Capital gains tax allowances

    Capital gains tax annual allowance for individuals increases to £11,700; and to £5,850 for trustees.

  • Marriage allowance

    Marriage allowance rises to £1,185.

  • Land transaction tax (Wales)

    Wales assumes responsibility for setting its own land transaction tax rates in place of stamp duty land tax.

  • Higher-rate threshold

    Higher-rate income tax threshold increases from £45,000 to £46,350.

  • National living wage

    National living wage increases from £7.50 to £7.83 an hour for over-25s.

  • Car benefit multiplier

    Car benefit multiplier rises to £23,400.

  • Company van benefit

    Company van benefit rises £3,350.

  • Enterprise Investment Scheme (EIS)

    EIS investment limits raised to £2 million for knowledge-intensive companies only.

  • Dividend allowance

    The tax-free dividend allowance reduces from £5,000 to £2,000.

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Details of expired compliance and regulatory deadlines.
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