Use this free calculator to calculate spousal support according to the Canadian Spousal Support Advisory Guidelines, as well as child support (if applicable). Calculate Ontario spousal support in minutes.Generate a courtroom-ready report. You should keep in mind that this free online calculator only considers employment income and can only do simple calculations. Use our calculator for Canadian spousal support estimates to help you understand what your support payments may look like. To determine how much spousal support is required, calculate your gross income. This is the amount of money you make after taxes and other deductions. There are two basic formulas used to calculate alimony in Ontario: the Without Child Support formula and the With Child Support formula. The federal Uniform Interstate Family Support Act (UIFSA) provides that New Jersey child support can be carried out if the payor lives out of state. HANDBOOK FCIC-18050 (01-2005) CONTAINS THE OFFICIAL FCIC-APPROVED.