Agreement between the Government of the United States of America and the Government of Canada with respect to Social Security. If you have questions about totalization agreements, call the Social Security Administration's Office of International Programs at 4109657306.These pages cover highlights of the Agreements and explain how the Agreements may help you while you work and when you apply for benefits. This Agreement shall apply to any person who is or who has been subject to the legislation of Canada or Bulgaria or both Parties. A certificate of coverage is used to inform the other country that the worker is covered under the Canada Pension Plan. For more information, contact the Social Security Administration or your Federal Benefits Unit. The Totalization Agreement allows U.S. workers to combine work experience in the U.S. and Canada to qualify for social security. Guide for Completing an Application for Canada Pension Plan. Important: Please read the reference guide before completing this section.