Accounts outsourcing gives a business a full accounts desk without building the team in-house. The same work — vendors, customers, bank, payroll inputs, and monthly close — is done on an agreed calendar, with files the auditor and the tax return can use.
For overseas companies the books are kept on QuickBooks, Xero, NetSuite, or Tally as specified, with reports in the format the parent or the local CPA expects. Indian entities get a close that already reflects GST, TDS, and PF/ESI so statutory filings are not a separate reconstruction.