Cash Flow Index (US)
A simple way to rank debt payoff by the monthly cash it frees.
Updated: 2026-01-21
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The Cash Flow Index is a debt payoff ranking metric: balance divided by monthly payment. Lower scores free more monthly cash for every dollar you pay off. It is not a replacement for interest rate math. It is a way to decide which payoff actually changes your options the fastest.
Last reviewed: January 21, 2026.
If a payment is strangling your month, start there.
Cash Flow Index = balance / monthly payment.
If two debts have similar rates, the one with the lower Cash Flow Index usually frees more monthly cash when it is gone.
Most payoff advice ignores the one thing that changes behavior: monthly margin. When a debt disappears, the freed payment becomes your new cash flow. That cash is what enables other moves: savings, investing, tax prep, or a buffer that keeps you from taking high‑cost credit later.
Debt A: $8,000 balance, $400 payment → Cash Flow Index 20. Debt B: $12,000 balance, $300 payment → Cash Flow Index 40.
Paying off Debt A frees $400/month sooner. If you need monthly breathing room, Debt A is the better first move even if the interest rates are similar.
Use the Cash Flow Index Calculator for a quick comparison, then run the Cash Flow Analyzer to get a payoff order that matches your actual goals.
This guide is for planning and coordination only. It does not provide financial or tax advice. Confirm decisions with a qualified professional.