The core activity of Kathrins Office is the provision of accounting and tax services for small and medium-sized enterprises (SMEs) and startups, particularly in the regions of Basel, Aargau, and Solothurn. This includes, among other things: financial accounting, accounts payable and accounts receivable, payment transactions, closing consultation and preparation, value-added tax declaration, withholding tax, corporate tax returns, support for company formation, temporary representation in accounting, and correspondence. The company also offers flexible and customer-oriented solutions, including the option to partially manage the accounting itself and have the annual financial statements prepared by the company.