file tax returns and pay taxes both on a monthly and annual basis. The annual tax returns must be filed by the end of March or beginning of April, depending on the taxpayer number. Double taxation treaties Currently, in order to avoid double taxation, Peru has signed and ratified treaties with the following countries: Brazil, Chile, Canada, Portugal, South Korea, Switzerland; and Mexico. All these treaties are largely based on the OECD Model Tax Convention. Negotiations to conclude tax treaties with Italy, Japan, the Netherlands, Qatar, Singapore, Thailand and the United Kingdom, and renegotiations with Spain, still continue. Peru is also a member of the Andean Community, along with Colombia, Ecuador and Bolivia. In this regard, Decision No. 578 is applicable for avoiding double taxation between Andean Community member countries, as well as for preventing tax evasion. Decision No. 578 prioritizes the taxation at the source, using the exemption method. References