I have created an app that I want to sell on the Google play store. I have created free apps before, but for selling one you need a merchant account; for that I need to register as a sole trader.
I am not planning on making a large amount of money off the app, probably less than £500 a year (I work full time and plan on doing this and a bit of freelancing on the side). I understand I must pay tax on all my profits, however as my income from freelancing will be less than the National Insurance Class 2 threshold of £5,965 will I have to pay national insurance on it?