Native. The ledger holds positions in 11 supported currencies simultaneously — USD, EUR, GBP, CHF, JPY, CNY, HKD, SGD, AUD, CAD, RON. Rates are auto-fetched daily from European Central Bank reference rates (or Fed, configurable per company; 'manual' is also supported for offline setups). Transactional postings lock the rate at event date. Open foreign-currency positions are revalued at the close-of-day rate with FX gain/loss separated cleanly from operational margin so the CFO can tell whether the quarter moved on margin or on rates.

Every operational event that affects an order's economics — PO confirmed, freight quote locked, demurrage charged, customer wire arrived — posts a journal entry, and that posting moves the order's gross margin number. The Profitability page lets the CFO slice the book five ways (By Product, By Client, By Manufacturer, By Order, By Market) with margin alerts surfacing every order below the configured target (default 20%) before it ships.

Before any supplier payment is released, three documents must agree: the purchase order (what was committed), the goods-received note (what arrived), and the supplier invoice (what is being charged). Same SKU, same quantity, same unit price, same currency, same total — within a tolerance you set (default ±0.5%). If they match, the payable auto-releases for payment. If a field disagrees, the payable holds with a single-line summary of which document and which field, and the operator corrects or escalates.

Yes. They get a read-only auditor scope to whatever data and timeframe you authorize — typically the prior-period trial balance plus the underlying postings. They see every journal entry, every source document, every actor and timestamp. They can drill from any entry to the operational event that generated it and export an audit pack. The Xero / QuickBooks sync (on the roadmap) is the alternative path for accountants who prefer to stay in their existing tool.

Computed per jurisdiction via the Tax module. The Tax page tracks tax rates, filing deadlines, sub-jurisdictions, and e-invoicing mandates per company. Postings carry the right tax codes; tax-ready reports generate on demand from the same ledger that posts the operational events.

Most days, there's nothing to close — every event has already posted. At period-end, TradeOS runs an automated close: revalues open FX positions at the period-end rate, accrues uninvoiced costs (the GR/IR sweep), and generates close drafts of the trial balance, P&L, and balance sheet. You review what flagged, e-sign the close, and the period locks for posting. Reversal-only after close; the original always preserved in the audit trail.

Yes — built on standard double-entry accounting principles. Every posting balances. Entries are immutable once posted; corrections happen via reversal entries with the original preserved in the audit trail. Chart of accounts, journal entries, trial balance, and period-locking are all first-class. The audit trail records every actor, timestamp, and source event so external auditors can defend the books from posting back to operational origin.