IMPORTANT INFORMATION! Accounting App application; The financial advisors who have purchased the E-Taxpayer software and the taxpayers holding these financial advisors books can use it free of charge. Please visit www.emukellef.com.tr for detailed information about the application. Turkey's First Mobile Application Accounting Office (the MUHASEBETÜRK Assurance) MuhasebeApp is the application of your accounting office. Thanks to MuhasebeApp application, all taxpayers can do all of the followin