Protect the required floor first
List essential expenses, every required debt payment, and a reasonable cash buffer. Extra payoff starts only after those obligations are covered; otherwise one disruption can create another high-cost balance.
Test several fixed amounts
Compare the current payment with an extra $50, $100, and $200 or percentages that fit your income. Record both months saved and interest saved so a small-looking monthly change can be evaluated over the full remaining term.
Confirm how the lender applies extra money
Check whether the extra amount reduces principal, advances the due date, or triggers any prepayment terms. Continue scheduled payments unless the lender's instructions clearly say otherwise.
Example: $20,000 at 9% over five years
The modeled scheduled payment is about $415.17 and total interest about $4,910. Adding $100 per month pays the balance in about 47 months with roughly $3,727 of interest—around 13 months sooner and $1,183 less interest.
What to check before you decide
- Verify prepayment rules and payment allocation with the lender or card issuer.
- Do not treat irregular bonuses or refunds as guaranteed monthly cash flow.
Sources behind this guide
These official and primary sources let you verify rules, definitions, and terms that may change.
CFPB — How to reduce your debt↗CFPB — What to do if you cannot pay a credit card bill↗