An account statement is a periodic document provided by a broker, depository, or mutual fund registrar that summarises all transactions, holdings, and balances in an investor's account over a specified period. For demat accounts in India, NSDL and CDSL generate Consolidated Account Statements (CAS) that consolidate holdings and transaction history across all folios and demat accounts linked to a single PAN. Regular review of account statements is essential for investors to verify trade accuracy, track portfolio performance, monitor dividend credits, and detect any unauthorised transactions.