Debt payoff and savings comparison
Pay debt or keep cash in savings? Compare the scenarios
Compare using a one-time cash amount to reduce a debt with retaining it in savings, using your debt rate, savings APY, payment, and time horizon.
Compare using a one-time amount of available cash to reduce one debt with keeping that cash in savings while making the same monthly debt payment. This is a scenario comparison, not a recommendation. Only enter cash you are actually considering using; the tool does not decide what emergency reserve you need.
Enter the debt and cash assumptions to compare both scenarios.
How the comparison works
In the debt-payment scenario, the one-time cash amount reduces the starting debt immediately, up to the amount owed. Any excess remains in savings. In the savings scenario, the full amount stays in savings. Both scenarios then apply the same monthly debt payment until the debt is paid; after payoff, that planned payment is deposited into savings for the rest of the selected period. The tool reports ending debt, savings, interest paid, and net position (savings minus debt).
Debt interest is modeled monthly as APR ÷ 12. Savings grow monthly at the rate implied by the entered APY. Payments are made at month-end, with a final payment limited to the remaining balance plus that month's interest. The model assumes fixed rates, no fees, no new borrowing, no missed payments, and no taxes on savings interest. Actual lender payment allocation, payoff fees, savings terms, taxes, and timing may differ.
The CFPB describes emergency savings as a reserve for unplanned expenses and says the amount needed depends on a person's situation. Consider whether using cash would leave enough accessible savings for your own needs. The CFPB debt booklet also offers worksheets for identifying debts and prioritizing payments. Sources checked November 3, 2026: CFPB emergency fund guide (last modified October 29, 2025) and CFPB Your Money, Your Goals: Debt booklet.
This calculator does not forecast investment returns or tell you which choice is best. It compares only the entered assumptions. Keep required payments current and check your account terms before making an extra payment.
Related planning tools
Estimate a reserve target with the emergency fund scenario calculator, model a fixed debt payment with the debt payoff planner, or compare payoff order for several balances with the debt snowball and avalanche calculator.
How it works
Enter one debt balance, its APR and monthly payment, the one-time cash amount you are considering, a savings APY, and comparison period. The model compares ending debt, savings, interest, and net position under both scenarios.
Good to know
Does the calculator recommend whether I should pay debt or save?
No. It compares the values you enter and does not account for your full budget, access needs, taxes, loan terms, or personal circumstances. Consider your own need for accessible emergency savings before using cash for an extra payment.
How are interest and payments modeled?
Debt interest accrues monthly at APR divided by 12. Savings accrue monthly at a rate derived from the APY you enter. Both scenarios use the same monthly debt payment until payoff; afterward, that payment is added to savings.
Does this include taxes or fees?
No. It assumes fixed rates and excludes taxes on savings interest, fees, new borrowing, missed payments, and contract-specific payment rules.
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