Regardless of which type of second income you decide to go for, make sure you don’t forget about your tax. If you earn less than £1,000 in the tax year from a second income, you don’t need to pay any extra tax. This is known as your trading allowance.
If you earn over that, you need to start keeping track of all your income and expenditure, because you’ll need to complete a self assessment tax return. Don’t worry, if you’re just earning a few thousand a year it won’t be too difficult.
You should set aside the amount of tax you expect to pay, otherwise you might be in for a bit of a shock when the tax bill comes in from HMRC.