He stopped paying the full amount when his health failed, and assumed the court would fix the past later. It did not. A new BC Supreme Court decision explains effective notice, retroactive variation, and what it takes to retroactively cancel support arrears.

BC father paid the 2012child support amount for over a decade and never disclosed his rising income. The court just ordered $41,457 in retroactive child support and did so after the child reached 19 years of age.