You need a provincial attestation letter (PAL) or territorial attestation letter (TAL) to apply for a study permit. This affidavit of support provides financial sponsorship for a student.The sponsor certifies that they are willing and able to support the student financially. Learn all about writing an affidavit in support of student visa for your education abroad, with two sample letters for reference. You must prove that you can support yourself and the family members who come with you while you are in Canada. Completing and signing Form I-864 makes you the sponsor. How to Apply for a Visa at a US Embassy or Consulate as a Third Country National in Canada or Mexico Affidavits of support must be written on your own if a form isn't given to you to fill out. An affidavit of support shows the U.S. government that the applicant will not be forced to rely on U.S. government welfare programs while in the United States. The visa application form must be filled out entirely and precisely.