The prohibition of determining the contract price in foreign currency or based on foreign currency is imposed for many contracts (namely, chattel and real estate sales and leasing, financial leasing, labour, service and construction agreements) that are concluded between the Turkish residents, with 13/9/2018 dated and 85 numbered “the Decree on the Amendment of 32 numbered Decree regarding the Protection of Turkish Currency” (“Presidential Decree”). Under this new regulation, the necessary of amendment of the contract price converted into Turkish currency is needed for the contracts in the scope of the prohibition. At this point, a stamp tax problem occurs for the amended contracts.