If we spell out our child support agreement in our separation agreement, does the judge have to accept it?

No, the judge is not bound by your agreement, or any part therein. If he or she should find that the agreement is unfair, unreasonable, inadequate, illegal, or subject to fraud, he or she can set it aside. Child support is very crucial to the future of the child(ren), therefore the judge will make it an appropriate amount based upon issues like income, potential income, expenses, and visitation, which are normal variables in all child support guidelines