You can report the 1042-S as other reportable income, according to KarenJ2 in this Turbo Tax link.
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Open your return in TurboTax
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Click on Wages & Income
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Scroll down to All Income
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Scroll down to Less Common Income
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Scroll down to Miscellaneous Income, 1099-A, 1099-C
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Click start
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Scroll down to Other reportable income
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Answer yes
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Enter description and amount
To report the US tax paid:
- With your return open
- Click on Deductions & Credits
- Scroll down to Estimates and Other Taxes Paid\
- Click on Other Income Taxes
- Scroll down Other Income Taxes
- Click on Withholding not already entered on a W-2 or 1099
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