If you had a refusal before, and you did not mention it, you have to inform IRCC and provide a LoE.
All your visa refusals should be declared in your application, not doing so can lead to misrepresentation. As per law, you have an obligation to be truthful. Section 16(1) of the IRPA states:
- 16 (1) A person who makes an application must answer truthfully all questions put to them for the purpose of the examination and must produce a visa and all relevant evidence and documents that the officer reasonably requires.
See Tuiran v. Canada (Citizenship and Immigration), 2018 FC 324 (CanLII), <
http://canlii.ca/t/hr59k
Alalami v. Canada (Citizenship and Immigration), 2018 FC 328 (CanLII), <
http://canlii.ca/t/hr6r1>
If you file any application with IRCC, for a TRV, WP, PR etc, any of them can be looked into to review your current application and any inconsistency can be a cause of misrepresentation. All applications have to be consistent, and if they are not, a reason why you omitted the information has to be provided.
The law is clear, while applications for different types of status engage different considerations, it does not necessarily flow that statements made in temporary residence applications cannot affect subsequent permanent residence applications (or vice versa). In Suri v. Canada, the court found that the Officer’s concerns vis-à-vis the contradictions between the Applicants’ temporary and permanent applications were reasonable and based on that the applicant's misrepresentation ban was upheld.
Federal courts have ruled on this numerous times.
Read - Suri v. Canada available at
http://canlii.ca/t/grvwt