Methodology

777.ee calculators and references aim to give a fast, checkable result under Estonian rules. We rely on official sources: Riigi Teataja (acts and regulations), EMTA guidance, Eesti Pank (late-fee base rate) and the Business Register (RIK) where relevant.

Tax rates and effective dates are collected on /maksumaaraad/ and in the rates.ts source file (value, effectiveFrom/To, sourceUrl, reviewedAt). Tool pages show the formula, assumptions, examples and source links.

Calculation logic lives in pure functions (src/lib/calc) covered by unit tests on official or verified examples. That reduces accidental errors but does not replace legal or accounting advice.

Wording we use: “checked against official sources as of [date]”. We do not display an “expert reviewed” badge or claim that every scenario is exhaustive.