I imagine that’s how it is in every sane country, yeah.
I get a letter stating how much I owe or will get reimbursed from the information they have.
If I have additional revenue or tax deductions that aren’t listed in the prefilled forms, I can add them and submit them (or have a tax accountant do it).
Does anybody every admit to more income? lol.
The letter comes with an envelope that doesn’t need postage.