Why follow-up is the first task to get dropped
An unpaid invoice does not chase itself. Someone has to open the accounting software, find the overdue invoices, write an email firm enough without being rude, then remember to do it again if nothing moves.
We have no Quebec statistic to quote here, and we will not invent one. But you know the mechanics: follow-up demands consistency and earns no credit. When the week gets busy, it is the first thing pushed back. Meanwhile the money stays with your customer.
Run the math on your own numbers: the total of your overdue invoices today, and the time your team spends each month chasing them. If you are paying interest on a line of credit while that money sits elsewhere, add it in. That is the cost of the task.