The increase of income of the custodial parent only impacts the child support calculation if you are in a state that considers the income of both parents in the child support guidelines
, if not the increase in the custodial parent's income does not impact the support calculation. If the state uses income of both parents in the statutory guidelines, then the increase in the custodial parent's income would reduce that parental share and reduce the share of the other parent by the percentage of the increase in income. But, in order for the change to occur by court order, the party seeking the adjustment in the support needs to show a significant change in income, meaning generally over 25%.
As far as the new child to the non-custodial parent, the court has no concern regarding other families or children of the non-custodial parent when it comes to paying support and it does not impact the support payments for the other child.
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