That's how it works in Australia. Employers report earnings, banks report interest, etc. and doing your tax return is logging into the tax office's web app, looking at what's there, adding any extra income, entering any deductions, and then hitting 'Submit'. Any return is electronically transferred within 14 days (otherwise you get a bill).

Once I have the statements I need from investment funds, etc. I've never had a tax return take much more than about half an hour, and I've never paid a cent to file anything.