I have dual citizenship -- US and other -- and I'm living abroad. What form do I fill out so the paying company will not take out backup withholdings?
if you wish to not allow your agent to withhold tax then you need to submit W8 Ben. But in your case its not likely to happen. As you are not allowed. Please read below statement by IRS.
Do not use Form W-8BEN if You are a U.S. citizen (even if you reside outside the United States) or other U.S. person (including a resident alien individual). Instead, use Form W-9, Request for Taxpayer Identification Number and Certification, to document your status as a U.S. person.
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