US/UK dual national wanting to take out a stocks and shares ISA

Hi there - I'm UK domiciled, but a dual UK/US national. I'm aware of the PFIC issues around stocks and shares ISAs. My question relates to the tax paperwork required for a US citizen in the UK who wants to buy individual US stocks. Trading platforms require a W8 form to be completed by British citizens; the IRS requires a W9 to be filled in by US taxpayers resident in the UK. What are the implications of the W9 from a tax perspective for a US citizen investing from the UK? i.e is there a withholding tax, even on US citizens? Many thanks.

Hi ,
 

You can only open an ISA if you are tax resident in the UK in the tax year you wish to open the ISAd.  The UK does not levy a dividend withholding tax.  Please have a look at : Individual Savings Accounts (ISAs)  . Thank you .

Many thanks - yep, I'm tax resident (and domiciled) in the UK. The difficulty comes from concurrently being a US citizen, which restricts, for tax reasons, what I can invest in i.e no mutual funds containing individual stocks that don't have HMRC reporting status. I'm just wondering if filling in a W9 and buying individual stocks still entails punitive tax withholding measures - but it might be that this is a question for my broker or for the IRS. Thanks again -