Tax Calendar: Important Dates & Deadlines
March - April 2018

This article was published on 02/04/2018

March 2018

1st - 2016/17 Self Assessment payment now 30 days late = 5% charge on the tax owing on that day.
13th - Budget Day - The Spring Budget Day.
31st - Closing date to claim for the Winter Fuel Benefit for this year.
March - Last minute tax planning. Double check you have availed of all relevant allowances/ exemptions for capital gains tax, inheritance tax, ISA's and pension. Check out our article on making the most of your annual allowances.

1st - Last chance to pay any balance of 2016/17 tax and Class 4 NICs to avoid an automatic 5% late payment penalty.
1st - New advisory fuel rates for users of company cars effective from today.
19th (22nd if paid electronically) - PAYE, Nat. Ins.,Student Loan & CIS monthly deductions due. Last day to send in Employer Payment Summary's (EPS) for month ended 5th March.

1st - Introduction of the new 16.5% VAT flat rate for businesses with limited costs. More Info here.
5th - End of 2016/17 tax year. Last chance to avail of annual exemptions for capital gains tax, inheritance tax, pension allowances and ISA's
5th - Last chance to use up any unused pension allowance from 2014/15; or to claim back any overpaid tax from 2013/14; or to top up your NI contributions for the sake of your state pension for 2011/12.
6th - New tax year commences as do any tax changes such as the increase in the basic personal allowance to £11,850
6th - HMRC issue Self Assessment Returns and Notices to Complete a Return for the year to 5 April 2018.
30th - Last chance to avoid the £10 a day additional penalty on outstanding 2016/17 Self Assessment tax return.

6th - Employers must check their payroll software incorporates the 2018-19 changes from today. Also make sure any relevant changes to employees tax codes for the 2018/19 year have been made.
19th - Your final Full Payment Submission (FPS) for the 2016-17 year should be returned by today.
19th (22nd if paid electronically) - 1st quarter PAYE/Nat. Ins. payments due for period 6th Jan to 5th April 2017.
19th (22nd if paid electronically) - PAYE, Nat Ins, Student Loan & CIS monthly deductions due.
19th (22nd if paid electronically) - Interest is charged on any outstanding PAYE/CIS from 2016/17.

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