I’ve lost my tax receipt, how can I get a new one? Knowledge Network Help July 24, 2019 19:57 Updated Contact us by phone, email or mail and we’ll be happy to send you duplicate. Related articles Will I get a Canadian charitable tax receipt for my donation? I’ve lost my tax receipt, how do I obtain a new one? My Knowledge Magazine has stopped coming but I gave you a donation just a few months ago. What happened? What information we track and why I forgot to donate to Knowledge Network by December 31, can you backdate my tax receipt?