October
| 1st | - Due date for payment of Corporation Tax for period ended 31 December 2009 |
| 5th | -Individuals/trustees must notify HMRC of new sources of income/ chargeability in 2009/10 if a Tax Return has not been received |
| 14th | - Due date for income tax for the CT61 quarter to 30 September 2010 |
| 19th/22nd | - Quarter 2 2010/11 PAYE remittance due |
| 31st | - Last day to file 2010 paper Tax Return |