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US Double Taxation - Business Trips and the Foreign Tax Credit
If you're a US citizen, money earned while in the US is sourced to the US. So you can't apply FTC/FEIE to the amounts attributable to the periods of your work while in the US even if it is a short business trip. Tax treaties may affect this. Most tax treaties have explicit provisions to exclude short trips from the sourcing rules, however due to the "saving clause" these would probably not apply to you if you're a US citizen - you'll need to read the relevant treaty. Your home country should allow credit for the US taxes paid on the US-sourced income, and the double-taxation avoidance provision should apply in this case. The technicalities depend on your specific country. You would probably not just remove it from the taxable income, there probably is a form similar to the US form 1116 to calculate the available credit.