An Internet accounting system, where transactions are entered on the spot and business data created by transactions are distributed to appropriate staff of the company, becomes more important for companies operating worldwide. The Internet accounting system described in this paper consists of a three-tier structure: Web, application and database servers. The accounting system provides complete accounting functions including general ledger, accounts payable, accounts receivable, purchase order, sales order, inventory management, fixed assets, temporary payment, multi-users, multi-currencies, multi-companies and multi-languages allowing customer relation management, partner relation management, supply chain management and performance analysis.