Running your own business may feel like a step towards personal freedom – but one downside is that you may need to start to file a Self Assessment tax return. Self Assessment is a system that HMRC uses to collect information needed to calculate how much income tax you should pay. And if you’re running a small business, it can feel like a big task to work out how much you owe. 1. Get your house in order Completing a Self Assessment tax return is much easier if you have good re