You'll need also a Letter of employment for the time you were working for your employer, including NOC, Salary, duties, dates and worked hours. Learn everything about job offer letters for immigration, including eligibility criteria, required documents, and the process.An offer letter provides a brief overview of the position and company and includes specific job details, such as start date, salary, work schedule and benefits. In the formal offer letter, provide comprehensive details about the position, compensation, benefits, and other pertinent terms. A job offer letter is a document that a Canadian employer gives you (as a temporary worker). It explains the details of your job. The letter looks good and sufficient. Make sure of the following. A TN employment letter that provides info about employer, why i am best fit, my qualifications, salary, duties and specific time frame, etc. PURPOSE: The primary purpose for completing is to respond to your request for assistance with an immigration benefit application, petition, and document.