March 19

• Postal payments for month ended 5 March should reach your HMRC Accounts Office by this date. If you pay late you may have to pay a late payment penalty.
• Receipt of the Contractors Monthly Returns for month ended 5 March for those under the Construction Industry Scheme is due by this date whether submitted electronically or on paper.

March 22

• Electronic payments for month ended 5 March must clear into the HMRC bank account by this date. If you pay late you may have to pay a late payment penalty.

March 31

• Companies House filing date for companies with a year end of 30 June 2015.