The Without Child Support Formula. Enter on line 21999 of your tax return the total amount of support payments you paid under a court orders or written agreements.There are two basic formulas used to calculate alimony in Ontario: the Without Child Support formula and the With Child Support formula. In divorce, the issue of spousal support is often heavily contested. Get the edge you need with our attorneys in Orange County. "Spousal support" is the money that one spouse may have to pay to the other spouse for their financial support following a separation or divorce. Set up and change spousal support when going through a separation or divorce. There is no set formula for long term support. Come up with the new order amount (note: the new order amount is calculated using the same formula as in court). The earnings assignment order tells your spouse's employer to take the support payments out of your spouse's pay.