+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
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When you hold a multiple entry visa, do you need a new invitation letter every time you come back to Canada?

No, just a two way ticket! Return ticket is very important.
 
Only if the CBSA officer asks to see it.

Actually, airlines will refuse to board you without onward passage from Canada. Experienced this several times personally. It’s policy with the vast majority (if not all) of airlines that fly into Canada.
 
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