I'm working on a 1040NR. On what form do I input the federal tax withheld from form 1042-S ?

[LG-CPA]

On the Tax Payments Worksheet - Line 18a Other Withholding

[Greg R]

When I do that, the withholding appears on line 25c, instead of line 25g for Form 1042-S.

[LG-CPA]

Yep - sorry - open 1040NR Worksheet - direct enter 1042-S withholding on Line 25g on the worksheet.75

[LG-CPA]

Ignore that "75" after the period.  Working and answering at the same time and didn't toggle over.

[Greg R]

Thank you so much for your response re the 1040NR worksheet.  That did the trick.  Thanks again.

[LG-CPA]

No problem - apologies for the initial misdirection.  

[brianalanlang]

It is far better as the form calculates if you enter any withholding into 1040-NR Worksheet where there is an input for 1042-S withholding.