That's not a problem. You won't get into trouble for not declaring a deduction (in my jurisdiction, anyway). They don't know your business income either of cou

That's not a problem. You won't get into trouble for not declaring a deduction (in my jurisdiction, anyway). They don't know your business income either of course and you do have to declare that, but most people have only income as an employee and they do know that figure, so most people don't need to "file" anything here. It's all automatic.