I'm a dual US/UK citizen and moved back to the UK permanently. I'm retired and receive Social Security and a company pension from the US as well as UK State Pension. I want to retain my US citizenship so from some posts I've read on this forum it looks like I will have to pay my taxes in the UK on everything and then claim a Foreign Tax Credit from the IRS. No witholding tax is taken from my Social Security but I get $125 a month taken from my company pension. I contacted the administrators of this pension to stop the witholding but they told me since I now have a UK address I can't do it online or over the phone. They advised me to fill in a Form W-8BEN but when I downloaded this from the IRS site I saw that I can't use it if I'm a US citizen. It tells me instead to use Form W-9. Looking at that form I see I can only enter a US address. Anyone familiar with this situation? Maybe I can enter my UK address in the "City, state and ZIP code" line.