Sources / Last Updated

Review status

Last substantive review: September 2, 2026. This review covered the Debt Payoff Planner, Credit Card Payoff Calculator, Credit Card Minimum Payment Calculator, Credit Card Extra Payment Calculator, Savings Goal Calculator, Emergency Fund Calculator, optional AI Insights, provider disclosures, source links, and trust-page consistency.

Calculator formulas and tests are reviewed after material logic changes. Evergreen educational content is reviewed at least annually. Time-sensitive rates, regulations, provider terms, and market data are reviewed at least quarterly or sooner when a primary source changes.

Calculator methodology and testing

The exact formulas, payment order, baseline comparisons, validation rules, and known model limitations are maintained in the Methodology. Automated tests cover Snowball and Avalanche ordering, payment rollover, zero-percent debt, insufficient payments, final reduced payments, negative-balance prevention, single-card payoff schedules, dynamic minimum-payment policies, recurring and one-time extra payments, payoff-goal solving, baseline savings, savings APY projections, required-contribution solving, contribution frequencies, milestones, and what-if scenarios.

Savings APY and compound interest

The Consumer Financial Protection Bureau defines annual percentage yield as an annualized rate that reflects the interest rate and compounding frequency. MonetAdvice converts the entered APY into an equivalent rate for the selected contribution period so that the modeled periodic rates compound back to the annual APY. See the CFPB's Appendix A to Regulation DD.

The FDIC explains that compound interest adds earned interest to principal, allowing later interest to be earned on the combined balance. See the FDIC's compound interest overview. Actual account crediting, balance methods, APY changes, fees, withdrawals, and taxes can produce different results.

Emergency savings

The Consumer Financial Protection Bureau describes an emergency fund as a cash reserve for unplanned expenses or financial emergencies and explains that the amount depends on the person's situation. See the CFPB's emergency fund guide.

FDIC consumer guidance discusses emergency savings in relation to several months of living expenses, while emphasizing regular saving and access to funds. These references support the visible comparison scenarios, not a claim that one coverage period is correct for every household. See the FDIC's saving for the unexpected guidance.

Debt payoff strategies

The US Consumer Financial Protection Bureau describes the highest-interest-rate method and the Snowball method, including maintaining minimum payments on other debts and rolling a paid-off debt's payment into the next target. See the CFPB's guide to reducing debt and reducing debt worksheet.

The motivation discussion in the Debt Snowball vs Debt Avalanche guide is based on a field study and three experiments published in the Journal of Consumer Research. The study found that concentrating repayments can increase motivation and that the effect was strongest when repayments were concentrated on the smallest accounts. See Repayment Concentration and Consumer Motivation to Get Out of Debt.

Credit card interest

MonetAdvice intentionally uses APR divided by 12 as a simplified monthly rate. The CFPB explains that many issuers instead calculate interest using an average daily balance or daily periodic rate. See the CFPB explanations of credit card interest calculations and the daily periodic rate.

Credit card minimum payments

Minimum-payment formulas differ by issuer and account agreement. The Consumer Financial Protection Bureau explains that a minimum payment is the amount required to keep an account current and that paying more than the minimum reduces interest cost and payoff time. See the CFPB guidance on credit card minimum payments and review the formula printed in the card agreement and monthly statement.

CFPB Regulation Z Appendix M1 requires issuers preparing minimum-payment repayment disclosures to use the formula or formulas that actually apply to the account. MonetAdvice therefore labels its preset formulas as representative or illustrative and does not claim that they reproduce a particular card agreement. See Appendix M1 to Regulation Z.

Optional AI Insights and Google Gemini

Optional AI research currently uses the Gemini API with Google Search grounding. Google's Gemini API Additional Terms state that paid-service prompts and responses are not used to improve Google products, while limited logging can occur for safety, security, and legal purposes. The same terms state that Google Search grounding stores prompts, contextual information, and output for 30 days for grounded-result delivery, debugging, and testing.

Product implementation details are described in the Privacy Policyand Methodology. Provider terms can change and control Google's processing independently of this summary.

Hosting and technical delivery

MonetAdvice is hosted by Vercel. Vercel documents its processing of request, device, security, service, and IP-derived information in its Privacy Notice. Google Analytics 4 provides consented site analytics. Google documents the information collected by its default implementation and its first-party cookie behavior in its data collection and cookie usage guidance. MonetAdvice does not currently connect an advertising provider.

When professional help may be appropriate

A calculator cannot assess hardship, settlement, bankruptcy, legal defenses, or a complete household budget. The Federal Trade Commission publishes guidance on getting out of debt and evaluating credit counseling. The National Foundation for Credit Counseling agency findercan connect US consumers with an NFCC-certified credit counselor.

Corrections

Report a source, wording, privacy, or calculation concern to support@monetadvice.com. Include the page URL and a primary source when possible.