How We Research

Our research process starts with the decision a reader is trying to make.

We identify the key variables, prefer primary or authoritative sources for factual rules, document calculator formulas and distinguish general education from country-specific requirements.

Source hierarchy

Regulators, government agencies, central banks, official statistical sources and provider documentation are preferred for factual rules.

Calculations

Calculator inputs, formulas and assumptions are disclosed on the relevant tool page wherever practical.

Comparisons

We compare features that affect real cost or usability rather than creating unexplained rankings.

Review

Material updates should be checked for internal consistency, working links and calculation accuracy before publication.