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In VA they use what is called the "income shares model" where they look at the gross monthly income of BOTH parents and combine it to get the statutory amount due from the guidelines. Once they determine the monthly amount of support due based on the statutory guidelines, then they take the percentage of the combined gross monthly income that the husband contributes to the gross monthly income and that is the percentage of the monthly child support from the guidelines that the husband has to pay.
For example, if the wife makes $6000 per month and the husband makes $4000 per month gross. They add that together and look at the guidelines to see what the monthly support amount is for $10,000 combined income. Then they would take 40% (since the husband contributes 40% to the gross monthly combined income) and the husband would have to pay 40% of the statutory support if the mother is the custodial parent.
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