Yes. The chances are you will. You need to pay income tax as soon as you earn over $18,200 a year (which is roughly $350 a week). Remember you’re taxed on your combined income. So, if you have more than one job, your tax is based on everything you earn as one big sum. Other things can contribute towards your income total, like Centrelink or support payments. Usually, your boss will take care of your payments for you. You just need to provide one thing – your Tax File Number.