This applies to all American citizens living in Mexico, which obviously includes those of us living in Baja:
From the IRS Website:
Automatic 2-month extension. You are allowed an automatic 2-month extension to file your return and pay federal income tax if you are a U.S. citizen or resident alien, and on the regular due date of your return:
You are living outside the United States and Puerto Rico and your main place of business or post of duty is outside the United States and Puerto Rico, or
You are in military or naval service on duty outside the United States and Puerto Rico.
If you use a calendar year, the regular due date of your return is April 15. Even if you are allowed an extension, you will have to pay interest on any tax not paid by the regular due date of your return.
This means that you MUST file your taxes by June 15th. If that is not enough time for you, you can apply for an extension by filling out the form 4868, which can be found at