Perhaps you could explain what administrative cost you feel is associated with a cash ISA. It's similar to a standard UK savings account, so there is no administrative fees with the bank/building society. Just a fact check: you do agree that a stocks and shares ISA is an entirely different animal to a cash ISA, with the one common similarity that neither are tax free in the US?
Xpost with DSL
The administrative cost I'm referring to is the "tax professional" cost and/or the time spent by the investor to satisfy US compliance and disclosure requirements. Not the fees charged to establish and/or maintain the cash ISA.There are many different flavors of cash ISA's. Here is simply one example by Aviva that I consider to be a trust.
"Your investment goes into the Cash Fund, which is one of the funds available in the Aviva Investors Investment Funds ICVC (Investment Company with Variable Capital) which is a collective investment scheme".
For purposes of U.S. federal income tax, a "trust" is defined to mean an arrangement by which title to property is held by a person or persons, with a fiduciary responsibility to conserve or protect the property for the benefit of another person or persons. Thus, a trust is an arrangement by which trustees take title to property for the purpose of protecting or conserving the property for the beneficiaries.
The various forms necessary for compliance have been discussed previously. I'd add form 926 to report the transfer of assets to the trust. Yes, I agree with your last statement and based upon my research, in most cases, I'd recommend against investing in either of these "animals".