The deadline for submitting 2015/16 self-assessment tax returns is 31 January 2017.
Declaring annual allowance charges for tax year 2015/16
In October 2016, Capita wrote to all members who have exceeded their 2015/16 annual allowance. It was explained that they would be liable for a tax charge if they do not have sufficient unused annual allowance to carry forward from previous tax years.
If this apples to you, please be aware that you will need to declare your annual allowance charge on your self-assessment tax return as you will have to pay a tax charge.
You can find more information about the annual allowance and paying the tax charge on GOV.UK.