Hello, @bookkeeper691. Yes, you can file a Company Tax Return (CT600) using ProTax in QuickBooks Online Accountant (QBOA), even if your business operates in multiple currencies, as long as you have completed all your workpapers accurately.
Before you begin, it's important to prepare your annual accounts. This involves gathering all relevant documents, such as invoices, receipts, and bank statements, and entering all necessary financial information into QuickBooks.