Child support rules are public law, but the math behind them is hard to find and easy to get wrong. SupportDecode runs the real state formulas and shows its work — every rate, cap, and table links to an official source with effective and last-checked dates. It is a free child-support calculator covering all 50 US states plus Washington DC, plus custody-schedule tools, expense-split calculators, and guides for parents, including single parents.
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