Australian here. The ATO (australian tax office) has a website you go to. It is pre-filled with various dada, your salary, your bank interest, uni loans, etc.

You add any additional salary, eg gig economy or crypto earnings (lol) and put in your deductions. I deduct heaps because I make money on the side renting out my camper van, and all its expenses are deductable from its earnings, but if you just have one job and thats it, then you can be done with your tax return in 10 mins, for free, online.

You can even preview your expected tax return before you commit. Once you commit, the return lands in your bank acvount usually within a week or so. You even get a receipt showimg what they spent your money on.