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Below are some key financial dates and deadlines for September.

1 September 2016
 
●     Payment of corporation tax liabilities for periods ended 30 November 2015 if not liable to pay by instalments.  
●     Check HMRC website for changes to car mileage fuel rates.
 
7 September 2016
 
●     Due date for VAT return and payment for 31 July 2016 quarter (electronic payment).
 
14 September 2016
 
●     Quarterly corporation tax instalment payment for large companies.  
●     Monthly EC sales list if paper return used.
 
19 September 2016
 
●     Pay PAYE/construction industry scheme liabilities for month ended 5 September 2016 if by cheque.  
●     File monthly construction industry scheme return.
 
21 September 2016
 
●     File online monthly EC sales list.  
●     Intrastat — submit supplementary declarations for August 2016.
 
22 September 2016

●     PAYE/National Insurance/student loan/construction industry scheme payments if paid online.

30 September 2016
 
●     Companies House should have received accounts of private companies with 31 December 2015 year end.  
●     Companies House should have received accounts of public limited companies with 31 March 2016 year end.
●     HMRC should have received corporation tax self-assessment returns for companies having an accounting period ended 30 September 2015.  
●     End of CT61 quarterly return period.
●     Business rates — small business relief claims for 2015/16 should be made to local authority by today.  
●     Businesses to reclaim EC VAT chargeable in 2015.