• want to fill in a paper tax return, you must send it to us by 31 October 2017 • decide to fill in your tax return online or you miss the paper deadline, you must send it online by 31 January 2018 – but, if you want us to collect any tax you owe through your wages or pension, you must file online by 30 December 2017 If we don’t receive your tax return by the If this tax return contains provisional figures, put ‘X’ in the box. 21. If you’re enclosing separate supplementary pages, put ‘X’ in the box. 22. Declaration. I declare that the information I’ve given on this tax return and any supplementary pages is correct and complete to the best of my knowledge and belief.