IELTS vs CLB Benchmarks

IELTS
IELTS - General Training is accepted by Citizenship and Immigration Canada (CIC) as evidence of English-language proficiency. If you are applying for permanent residency in Canada, it's likely that you will be required to present your test result as a part of your application. You can also submit IELTS results for Canadian citizenship.

Canadian Language Requirements
The Canadian Language Benchmarks (CLB) are the national standards used in Canada for describing, measuring and recognizing the English-language proficiency of adult immigrants and prospective immigrants for living and working in Canada.