The 90-day report is compulsory by law for all visa holders, except those on an LTR visa. Failing to do so may result in fines and other penalties (you can check the relevant law for details).

Will you be fined? As long as you don’t deal with an immigration office, you’ll likely be fine. The day you have to may lead to a fine or more. There’s nothing difficult about submitting your 90-day report just do it when required to avoid any issues. It’s that simple.