Self Assessment has changed. If you haven't done your Tax Return yet, you must do it online by 31 January.

• Self Assessment Tax Returns: 31 January filing deadline - Opens in a new window
• Find out about Self Assessment - Opens in a new window
• Find out about filing your tax return online - Opens in a new window
• Step-by-step online help to registering and filing - Opens in a new window
• Help for Agents - Opens in a new window