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Whether or not you are an employee or self-employed depends on the relationship between you and the person who pays you. You should check with the payer to see if they will be issuing a slip such as a T4 or a T4A.
The Canada Revenue Agency (CRA) needs detailed records of expenses paid and a record of work trips. CRA has documentation on their website regarding vehicle records:
https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partners...
Hope this helps
