The most important dates in the tax year are the following:
- Deadline for online submission of Self Assessment tax returns for tax year ended 5 April 2016.
- Deadline for paying Self Assessment ‘balancing payments’ for tax year ended 5 April 2016.
- Deadline for first Self Assessment payment on account for tax year ended 5 April 2016.
- End of tax year.
- First day of the new tax year.
- Deadline for second Self Assessment payment account for previous tax year.