I've submitted my 2012 tax return last year as an individual taxpayer. After which I started freelancing midway through August. I was on a six month contract with my ex-company (which ended on 31 January) where they deducted the tax for me, but have also been doing work for other companies/individuals that I would have to pay the tax on. My question is, should I have submitted a return before the end of January to pay in at the end of March? If yes, what do I do now to stay tax complaint?