Tax returns » Do I need to complete a tax return? » Go to message

I started up my company and registered as a sole trader April 2017. I am just a little confused about the tax return and have a few questions:

1. As I have only just started April 2017, do I need to fill out a form at all? I have been looking and reading a lot of conflicting information

2. If I do not need to fill one out yet, when will I need to do this? Will it be next year?

3. I've read that HMRC will either send you a letter or email in regards to the tax return, does this happen at all?

Thank you for any help in advance!