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Child support calculations are determined by state-promulgated guidelines. In Florida, you would add the net income of both parents (custodial and non-custodial). There is a chart that then tells you the child's basic support need based on this number (and the number of children). For example, if the combined net income is $650 and there is 1 child, the support amount is $74. To determine your portion of the obligation, you then determine your percentage share of the combined net income. If your portion of the combined net income of $650 is 85%, you pay 85% of $74 ($62.90).