A job offer letter is a document that a Canadian employer gives you (as a temporary worker). It explains the details of your job.You get a valid work permit and the right to work in Canada, otherwise no one will offer you a job. In most cases, the employer must send you: the job offer and a Labour Market Impact Assessment (LMIA) number; or; the offer of employment number. The Letter of employment is the same thing as the job reference letter. It is evidence for the jobs you listed in the Job history. 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. A job offer letter from a Canadian employer is a crucial document for obtaining a work permit and potentially immigrating to Canada. There are three ways that a job offer can be "valid" (and thus give you points) in Express Entry. One and two above are based on approved LMIAs.