Enter your monthly take-home pay. See the needs / wants / savings & debt split the 50/30/20 framework recommends.
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Needs: housing, utilities, minimum debt payments, insurance, groceries, transportation. Wants: everything discretionary. Savings & debt: retirement, extra debt payoff, emergency fund. The 20% isn't optional here — it's the line that actually builds your emergency fund and pays down debt faster than the minimum.