I assume you mean you are filing a US tax return and you paid income tax to Canada from a distribution you made from your Canadian pension. If so, the foreign tax would be entered in TurboTax in the Deductions and Credits section of TurboTax, then Estimates and Other Taxes Paid, and then Foreign Taxes.
You may be entitled to a foreign tax credit or itemized deduction for your foreign taxes paid on foreign income. The credit will usually give you the bigger tax benefit. Your credit for the year will be allowed only to the extent of US taxes paid on foreign income, with any unused credit carried over to future years.
To apply for a credit for foreign taxes paid or accrued during the year:
1. From the Federal section of TurboTax, go to the Deductions and Credits section
2. Find Estimates and Other Taxes Paid
3. Choose Foreign Taxes
4. Indicate that you paid foreign taxes or have credits from prior years
5. Work through the section until you see an option to take a deduction or credit, the credit is usually better
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