If you haven't received a relevant T-slip, We suggest to contact your employer ( Election Canada) directly  so they provide you the slip so you can report your income accurately.

Line 10400 – Other employment income if it is not reported on a T- Slip, you can enter that information in Self -Employment (T2125) under section as "Other Income"

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Thanks. Got it entered. Used information from saved payslip.  

@jplawton Great! Good to know that. Thanks for letting us know.