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. A job offer letter is a document that a Canadian employer gives you (as a temporary worker).It explains the details of your job. A sample letter offering a job contingent upon the results of a background check or other criteria. 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. Learn everything about job offer letters for immigration, including eligibility criteria, required documents, and the process. An employment verification letter can help prove income for a green card. Find a sample employment verification letter for immigration here. Find an application form or checklist. Always download a new form each time you submit an application.