To do this, they must use IRS Form 1040, which, on line 11, specifically delineates alimony received. No. Child support payments are not subject to tax.This Child Support Guidelines Calculator is for informational purposes only and is not a guarantee of the amount of child support that will be ordered. The amount of child support that either parent may have to pay following a divorce is based on several factors, and one of those factors is alimony. In New Jersey, child support is not deductible, but parents may take turn claiming the child(ren) as dependents for the tax benefits. Alimony awards that were entered or modified after December 31, 2018 are not taxable. Child support exists to support the children. This form must be completed any time you file a pleading for alimony, child support, etc. Do not leave any blank spaces. After a divorce, it's common to forget that alimony and child support will affect your taxes.