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When a province nominates you for permanent residence, you are not entitled to work in the country unless you also have a valid work permit. Until a prospective immigrant has been issued a Canada Permanent Resident Card (PR Card), he or she cannot work in Canada unless they have obtained legal working status from Citizenship and Immigration Canada (CIC).
In November 2016, Immigration, Refugees and Citizenship Canada (IRCC) updated the Express Entry ranking system greatly reducing the number of points awarded for arranged employment that includes a positive Labour Market Impact Assessment
As a result, Express Entry candidates with LMIA-based employment offers lost up to 550 points on their Express Entry score. A nomination certificate from a Provincial Nominee Program Canada is now by far the most valuable factor when applying for Express Entry immigration to Canada.
According to Canadian Express Entry statistics, almost 50% of prospective immigrants who were issued an Invitation to Apply for permanent residency in 2015 had an LMIA supported job offer. With the new updated 2018 Express Entry ranking algorithm, candidates without LMIA job offers may become much more competitive.