If the income is not reported on a T-slip, It can be reported as Self-Employment income for more clarification you can contact the Employer 

In TurboTax fill out the Self-Employed section (T21215) as 'Other Income".

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I don't believe this is correct.  It is US income paid  in US dollars.  The section you refer to does not include the ability to show the exchange rate.  The income must be reported in Canadian dollars.

@christinescharf51 If the amounts on your foreign income slip are reported in a foreign currency, convert them to Canadian dollars before entering them. If the amount was paid at various times throughout the year, use an average annual exchange rate.

For foreign nonbusiness income that isn't on a T-slip (including US Social Insurance), do not convert the amounts to Canadian dollars before entering them. TurboTax converts the amounts automatically based on the exchange rate you enter. 

Please follow our TurboTax FAQ for guidance: How do I report foreign income, pension, and other foreign amounts?