The core activity of Hallwilersee Treuhand AG is the provision of trust and accounting services, particularly for small and medium-sized enterprises (SMEs), individual companies, and private individuals. This includes, among other things: accounting and annual financial statements, payroll accounting and payroll administration, value-added tax returns and tax returns, financial and investment accounting, accounts receivable and accounts payable accounting, personnel administration and consulting, and support for pension institutions and physicians/dentists. The company also offers additional services such as office services and senior care.