Are you using the Canadian version of TurboTax, or are you using the US version and donating to a Canadian charity?
Generally, in order for a US taxpayer to deduct a charitable contribution on a US return, the recipient organization must be based in the US or have a US-based related organization. See below and this IRS webpage for more details:
The organizations listed in Tax Exempt Organization Search with foreign addresses are generally not foreign organizations but are domestically formed organizations carrying on activities in foreign countries. These organizations are treated the same as any other domestic organization with regard to deductibility limitations.
Certain organizations with Canadian addresses listed may be foreign organizations to which contributions are deductible only because of tax treaty. Besides being subject to the overall limits applicable to all your charitable contributions under U.S. tax law, your charitable contributions to Canadian organizations are subject to the U.S. percentage limits on charitable contributions, applied to your Canadian source income. A deduction for a contribution to a Canadian organization is not allowed if the contributor reports no taxable income from Canadian sources on the United States income tax return, as described in Publication 597.
Except as indicated above, contributions to a foreign organization are not deductible.
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