2026-01-18
Common arithmetic traps in multi-currency application packs
Exchange-rate footnotes and period cutoffs create quiet inconsistencies that surface late in review.
Multi-currency packs fail arithmetic tests when income is converted at month-end rates while liabilities use invoice-date rates without disclosure. The absolute difference may be small; the inconsistency still draws questions.
Period cutoffs create a second trap. A cash-flow worksheet ending 31 March cannot silently absorb April deposits that appear only in a later bank PDF.
During application review work, we rebuild a conversion bridge: source currency, rate, rate date, and NT$ equivalent for every material line. Gaps in that bridge become explicit findings rather than buried footnotes.
If you must estimate a rate for a forward period, label it as an assumption. Reviewers tolerate estimates; they distrust silent blending.