According to the IRS, "Under income tax treaties with Canada, social security benefits paid by those countries to U.S. residents are treated for U.S. income tax purposes as if they were paid under the social security legislation of the United States.”
Enter your Old Age Security pension in Wages & Income / Retirement Plans and Social Security / Social Security (SSA-1099, RRB-1099)
Refer to How do I enter my Canadian Pension Plan (CPP) or Old Age Security (OAS) benefits?
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