My son's father's pay drastically increases month to month (or reduces) due to his voluntary acceptance of overtime pay. That means that the Osler Smith order the court is granting me against him is going to insure I am not cheated out of due child support (since he cut his overtime right before we had our court date to look as though he was a lower income earner than what his history indicates). How do I calculate the amount owed me if the % changes each month? I need to get a VERY specific order on the Osler Smith wording as he will definitely lie in his own accounting he submits to me monthly. Since the % is a variable, the court won't order his employer to do the calculations and it will be up to me.