Our mission
Objective financial education.
Passerine Finance exists to help people understand how money works — saving, investing, borrowing, and credit — in plain language. Everything we publish is educational. Our calculators are teaching tools that show how a concept behaves when you change the numbers; they are not investment advice, and they are not personalized financial advice. We explain how ideas work; we do not tell you what to buy or steer you toward any product or outcome.
How we research articles
Standard math, reputable sources, plain English.
Articles start from established financial mathematics and reputable public data rather than opinion. We aim to explain concepts accurately, present tradeoffs honestly — showing both the advantages and the disadvantages — and keep the distinction between fact and interpretation clear. Where an article relies on economic or market data, that data comes from the public sources described on our Data Sources page.
How calculators are reviewed
Reviewable calculations.
Wherever practical, a calculator's calculation logic is kept separate from its on-screen interface so the math can be reviewed and tested on its own. We use standard formulas — compound growth, loan amortization, present and future value, and the like — and the calculations are deterministic: the same inputs always produce the same results. You can read more about how the tools are built on our Calculator Methodology page and how they are checked on our Calculator Testing page.
Assumptions
Documented and, where practical, editable.
Most calculators rest on assumptions — an inflation rate, an investment return, a loan rate, a tax figure. We document these assumptions and, whenever practical, expose them as inputs you can change so you can see how sensitive a result is to each one. Default values are chosen to be reasonable and clearly labeled, not to flatter a particular conclusion.
Accuracy and corrections
We fix mistakes.
We are committed to factual accuracy and review content periodically as laws, tax figures, and financial practices change. Despite careful checking, errors can still slip through. When we learn about a mistake — whether in an article, a formula, or a calculator — we correct it. If you spot something that looks wrong, please tell us through our Contact page; a specific example helps us reproduce and fix the issue quickly.
Independence
Funding does not shape the content.
Passerine Finance is free for readers. We earn revenue from custom and white-label tools and from sponsorships, but sponsors do not control our editorial content or determine the conclusions in our articles and calculators. Editorial independence is what makes the site worth trusting, and it comes first. We explain the business model openly on our How We Make Money page.
Related reading: Calculator Methodology · Data Sources · Calculator Testing · How We Make Money.