Methodology and sources

Estimates are only useful if you can see how they were produced. This is our process.

One decision per tool

Each calculator answers a single question, such as "is refinancing worth it?" or "how much should I set aside for taxes?". Narrow scope keeps the formulas auditable and the result easy to interpret.

Sources

• Tax rules and limits come from IRS publications and the Social Security Administration.
• Loan and mortgage math uses standard amortization formulas; rental metrics (cap rate, cash flow, DSCR) follow the definitions lenders and appraisers use.
• Vehicle and fuel costs use user-entered inputs with clearly labeled default assumptions you can change.

Updates

Reference values such as tax brackets, contribution limits and rates are reviewed whenever the underlying source changes, and each guide shows its last update date. This index was last updated 2026-11-09.

Limits

Results are estimates for planning and comparison. They do not account for every personal circumstance and are not financial, tax or legal advice. For decisions with significant consequences, confirm the numbers with a qualified professional.

Corrections

If you spot an error or an outdated figure, write to contact@moneycalcdesk.com and we will review it.