The state of New York does not consider it taxable income. Child Support Forms ; 4-8c.In New York, alimony is still tax-deductible for the payor and tax-includable for the recipient. No. Child support payments are not subject to tax. Nassau County calculates child support payments based on New York state guidelines. The judge will begin the determination of alimony amount with one of two statutory formulas depending on whether or not child support will also be paid. When a person has someone who financially depends on them such as a child or sibling, they can claim them when they file their taxes. You now find yourself unable to keep up with the Child Support payments a Nassau County or Suffolk County court originally ordered. Lumpsum payments of alimony or child support arrearages generally retain their character as alimony or child support for Federal tax purposes. Spousal Maintenance Calculator.