Spreadsheets are useful accounting tools when a knowledgeable owner can control a modest record, review formulas, reconcile the file, and preserve clear versions. They are also excellent for forecasts, reconciliations, allocation schedules, and analysis around a governed ledger.
Dedicated accounting and tax software becomes more appropriate when the workbook is being forced to act like a transaction system. Multiple people need controlled roles, invoices and bills need status, integrations create continuous entries, changes require history, periods must lock, or filings depend on repeatable mappings. The decision is therefore about record behavior and risk—not a universal revenue, employee, or transaction threshold. Software supplies structure; it does not supply sound policy or review.