Child support in Nevada varies depending on: How many children are receiving support, and The “non-custodial” parent's gross monthly income. “Gross monthly income” means the parent's pre-tax income from all sources, including: Salary, Tips, Commissions, Bonuses, Royalties, Investment income, Rental income, Interest, and Alimony from a prior marriage. If the parent is self-employed, he or she can deduct legitimate business expenses from the calculation of gross income.