Receipts are generally required to substantiate an expense. However, if you forget to obtain a receipt, you should write a receipt from yourself to your business in as much detail as possible. This is not advisable ideal, but Canada Revenue Agency has allowed this. If the expense is reasonable under the circumstances and you have attempted to be as accurate as possible.
How to Register for My CRA Personal Account
As part of your onboarding, we require that you complete the CRA