@yadayadayada If it's polymer - which I believe that one is - and not paper, it's still legal tender. They've intiated removed the 'legal tender' status from older paper bills, something I didn't know until I checked because of your question - so thanks... I'm going now to check under my mattresses 😄
https://www.bankofcanada.ca/banknotes/about-legal-tender/
https://www.bankofcanada.ca/banknotes/bank-note-series/canadian-journey/