September 19

• Postal payments for PAYE & NIC for month ended 5 September 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 September for those under the Construction Industry Scheme is due by this date whether submitted electronically or on paper.

September 22

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

September 30

• Companies House filing date for companies with a year end of 31 December 2017.