What documents do I need when switching accounting firms?

Financial Ledgers: Full Trial Balance, General Ledger, Chart of Accounts in Excel/CSV. Statutory Reports: Financial statements for last 5 years. IRAS Tax History: Submitted Corporate Tax Computations, Form C-S/C filings, ECI acknowledgments. GST Records: GST filing history and all IRAS correspondence. Schedules: Fixed Asset Registers, Depreciation Schedules, Bank Reconciliations. ACRA Filings: Annual returns and AGM documentation.