But the return is to be filed by you to the income tax department. Here is the guide how to file income tax return online step by step by which you can easily file your income tax return yourself.If you still don’t know which ITR form you have to fill up I would request you to read the article Which ITR form to file AY 2018-19. How to register and file a tax return online . The reasons that nearly 94% of tax returns are filed online are because, according to HMRC, it is easy, secure, available 24 hours a day, and you can sign up for email alerts and online messages to help you manage your tax affairs. Enter your information online. Each online tax filing program will give step-by-step directions explaining how to file your taxes online. For example, Turbo Tax will guide you through most of the steps required by some of the forms. It will also check for errors and provide you with an opportunity to fix them.