If you had any income for the tax year ended 5 April 2019 that the Revenue don’t know about, then you will need to file a tax return. You will also need to file a tax return if you had any capital gains for the same period, or if the Revenue have sent you a tax return. If you were thinking of doing it yourself, and you have left it this long, then consider sacking yourself as your tax clerk. You should have told the Revenue on October 5th if they don’t know, and you have until October 31st to file a paper tax return.
It’s time to see an accountant, who has until January 31st 2020 to file an electronic tax return, and does this for a living. Missing the October 5th deadline is nothing much to worry about if you act quickly.
Some people file their own electronic tax return, which can be done, but drafting a tax return is a funny way to spend Christmas.