The law in Illinois is a 45 day reporting period. You have to report within 45 days.
However, many employers – if you don’t report it that day or by the next day – they often will challenge whether or not it occurred at work.
In many cases, even if you report it on the day of injury, they will challenge it.
So, the reporting is important because of the position employers take. They’ll treat somebody, in my view, like a criminal if they’re hurt at work. Like they’re stealing from the company, when in fact, all they did was suffer an injury because they’re doing heavy or dangerous work.