Sources you can check
For tax and policy rules, we prioritize public material from the relevant authorities; for products and markets, we prioritize original material from issuers and exchanges. Pages identify external sources and their applicable year or reference date. Figures from different periods or coverage should not be compared as if they shared the same conditions.
Facts, assumptions and opinions
We distinguish facts supported by public sources from user-entered assumptions and editorial interpretation. A constant-return example is a calculation under stated conditions, not a forecast. Investment opinions should explain their reasoning and limits without promising returns from a specific product.
How to read a calculation
Our methodology explains formulas, input units, compounding intervals, rounding and exclusions such as taxes and fees. Language and currency are separate choices. Currency selection in general amount calculators does not convert amounts using an exchange rate; market-history tools explain any exchange-rate treatment in their own methodology. We distinguish dividend yield from total return, and nominal amounts from inflation-adjusted purchasing power.
Reference dates and data coverage
We collect and review price, dividend and exchange-rate data date by date. Updates may lag while collection and checks take place, so check the reference date and query coverage. An empty result for an uncovered period or security is not confirmation that no dividend occurred. Consult original sources for information outside our coverage.
Changing rules and validation
We review the applicable year and sources when updating tax or policy rules. Calculation changes are checked with automated tests for normal and boundary inputs. Public pages are reviewed in Korean and English, on mobile screens and with invalid inputs. These checks do not mean every product condition or individual tax situation is included.
Reporting a possible error
Use the contact page to send the page URL, entered values, disputed result and any supporting source. Sensitive information such as account numbers is unnecessary. We reproduce reported issues and check sources and assumptions; confirmed errors are reflected in the relevant explanation, calculation and validation checks. We also distinguish delayed data updates from calculation errors.
What to check before using a result
Calculators help compare conditions and make plans concrete. Consider changes in assumed returns, taxes and costs, and actual payment timing when using a result. Our disclaimer explains the scope of the information and responsibility for investment decisions.