This book refers to five chapters developed from the contextualization of the value of money in time until its application within the framework of project evaluation focused on the perspective of compound interest, exposing simple interest in a new way as a particular case of this type of interest (simple interest is shown as a special case in which compound interest does not accrue but it is paid after it is generated); are treated in the same way topics inherent to the different types of interest rates, plans of accreditation, financing and amortization plans (including series uniforms and gradients, calculated in Microsoft Excel through accreditation tables and amortization tables); the book ends with a chapter referring to the formulation of projects and their respective evaluation through different tools such as the present value net, the internal rate of return, the equivalent uniform annual cost, the benefit-cost ratio and payback.