Natural gas is the cleanest fossil fuel with the ability to transform into different products which in the recent decades has received much attention from industrial countries. Also the countries which own gas resources have done extensive planning for using it due to existence of large market for various products of natural gas. Among the various physical and chemical transforms of natural gas, the technologies of conversion to liquid products and liquefied natural gas (LNG) have faced very high demands. Technology to convert natural gas into liquid products by using Fischer-Tropsch procedure, converts natural gas into liquid fuels without sulfur. Liquefied natural gas technology not only meets natural gas traditional demand, but it also solves, the problem of long-distance gas transmission through the pipeline Then the possibility of exporting natural gas to distant markets is provided. Examining various methods of exporting natural gas is very important for Iran as the second-largest holder of natural gas since it enables Iran to choose the best way for exporting gas. The purpose of this study is to investigate the comparative economic effects of the exports of LNG and gas to liquid (GTL) based on Iran targeted subsidies law. This research is performed using Kamfar software and it is based on measures of net present value, internal rate of return and investment payback period. So after designing several scenarios for the price of feed gas for LNG plants and GTL, necessary studies on selected projects have been conducted. The results show that the use of both technologies has economic justification and reduction in operational and capital costs or increase in sales revenue will increase the project profitability. Also GTL exports project is more economical than LNG export project.