I've been considering how to invest while on the remittance basis, using a US taxable account -- with a view towards keeping the funds as "clean" as possible for a potential future UK remittance.
My understanding is that in a simple (i.e., bank) account situation, it is possible to open a US sweep account where interest is swept from the account, such that the account only contains capital. Assuming the capital is clean (i.e., it was transferred to the US account cleanly, post-UK taxes), that capital is remittable without issue.
However, I am struggling with how to structure a US taxable investment account in a similar way as I don't see how one can keep (clean) capital and interest separated in the context of making investments in a US brokerage account? Any gains in the NAV of a fund or increase in share price for instance, would result in capital gains which would not be taxed by the UK -- creating a mixed account situation, which I am trying to avoid.
Curious to hear how others structure US taxable accounts while on the remittance basis?