where do i input cash tips on my tax return

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You can report tips and gratuities along with other income that does not appear on T4 slips on line 10400 of your tax return as other employment income. TurboTax software will guide you to the appropriate section through the interview process to correctly enter your tips/gratuities.

https://turbotax.intuit.ca/tips/can-gratuities-be-taxed-in-canada-150