I set out below some comments about the taxation of distributions which RobertUSA may incur if he were to purchase US domiciled EFTs.
Remittance basis user
Robert mentions that he is a UK resident US citizen, but does not mention whether or not he is a remittance basis user for the purposes of UK taxation.
If Robert claims the remittance basis and does not remit the EFT distributions then he would not have any UK tax liabilities. His only concerns would then be US tax. This is reinforced by Article 1(8) of the DTR.
UK domestic rules
If Robert is not a remittance basis user, then he would be liable to UK tax on the distributions. Distributions from a non UK fund are generally taxed as dividends. (If the underlying income is from bonds the distributions would be taxed as interest income.) UK dividends are taxed in a different way from all other income-they are deemed to carry a 10% notional tax credit, and they are taxed at the special (lower) rates applying solely to dividend income. For instance, if Robert generally paid UK tax at a marginal rate of 40%, his dividends would effectively be taxed at a rate of 25%.
US domestic rules
As a US citizen, Robert would be taxed on the distributions as part of his worldwide income.
US withholding tax
My understanding is that while the US would impose a withholding tax on the EFT distributions if the payee was a non US citizen, it does not impose withholding on its own citizens, even when they are not US resident.
UK US DTR
My analysis of the DTR as applying to the distributions to Robert is-
• As a US citizen, the general terms of the DTR do not apply to Robert. Instead on the limited provisions listed in Article 1(5) apply to Robert. The limited provisions do not include Article 10 on dividends. The only relevant provision is Article 24, relief from double taxation, and in particular Article 24(6) deals with the taxation of UK resident US citizens.
• Under Article 24(6)(b) the UK is required to give credit for the US tax that would have been imposed on US source income if it had been paid to a non US citizen. If a non US citizen had received the distributions the US would be have imposed a withholding tax at the reduced rate of 15%. Therefore the UK gives credit for this 15% notional withholding tax. For instance, if Robert is generally liable to UK tax at a marginal rate of 40%, the UK liability at an effective rate of 25% is reduced by this notional withholding tax of 15%, leaving 10% payable in UK tax.
• Article 24(6)(d) then requires the US to treat part of the distributions as if they were UK source income to prevent the double taxation of such income. The precise workings of this depends on the rate of tax payable by Robert in the US.