Ideally, you and your ex will openly share financial information (such as your Notice of Assessment) each year to keep the amount of child support being paid current. By doing so, you can hopefully avoid claims for retroactive child support. If your ex is not providing you with updated financial information and you think they are incorrectly reporting their income, you have options: If you have a child support order, contact Alberta’s Child Support Recalculation Program to see if you qualify for the program. They can use tax information to calculate child support each year. Go to court and ask for retroactive child support. Last updated: March 2021