30th Sep
Last date for submission of self-assessment personal tax returns to HMRC where individuals wish for HMRC to calculate their tax and possibly code-out any underpayments.

5th Oct
Deadline for notifying HMRC of liability to personal tax where no tax return has been issued for tax year 2009/10.

2012

31st Jan
Last date for submission of 2010/11 self assessment personal tax returns to HMRC to avoid late filing penalty.

Due date for personal tax balancing payment for tax year 2010/11 and first instalment for tax year 2011/12.

5th April
End of tax year 2011/12

19th May
Last date for forms P14, P35 and P38A to reach the HMRC for tax year 2011/12.

31st May
Last date for forms P60 to be sent to employees for the tax year 2011/12.

6th July
Last date for forms P11D and P9D to be sent to the HMRC and employees for tax year 2011/12.

Last date for return of Class 1A NICs for tax year 2011/12.

19th July
Last date for payment of Class 1A NICs for tax year 2011/12.

31st July
Due date for second instalment of personal tax for tax year 2011/12.