The core activity of GK Fiduciaire is to provide services in the field of fiduciary economy, particularly in the following areas: * Accounting: Bookkeeping, Annual closing, Preparation of balance sheets and profit and loss accounts, VAT returns * Payroll: Preparation of monthly payroll slips, Notification of salaries to social insurance, Annual salary certificates, Assistance with contract creation * Taxation: Preparation of tax returns for employees, self-employed and retirees, Preparation of tax returns for companies (Sàrl, SA), Tax audit, Control of tax advances and modifications, Responses to tax authority requests and potential complaints * Consulting: Advice on accounting, payroll, VAT and tax returns Overall, GK Fiduciaire offers a comprehensive range of services in the field of fiduciary economy to support companies and individuals with their financial and tax matters.