The tax and regulatory framework on income derived from government bonds, treasury bills, and lease certificates in Turkey has become an important issue for individual investors. These instruments are fundamental components of traditional financial portfolios and are compared with alternative investment vehicles during periods of increasing economic uncertainty. Especially, lease certificates (Sukuk), with their compliance with Islamic finance principles, attract the interest of investors who want to create a diversified portfolio with crypto assets. Having up-to-date information about the return mechanisms and tax treatment of these financial instruments plays a critical role in developing long-term investment strategies.