国税庁から，U.S. LPの扱いについてアナウンス

これである。英文のInformation for Taxpayersのところにリンクがある。年金ファンドなどの扱いに関する納税者の懸念に言及したのち，

In light of 2005 tax reform (newly introduced loss limitation rules for foreign partnerships), the NTA will no longer pursue any challenge to the fiscally transparent entity (FTE) treatment of an item of income derived through a U.S. LP. The NTA treats an item of income paid to and through a U.S. LP of which Japanese residents are partners as derived by the Japanese resident partners and subject to tax on a current basis in the hands of the partners, irrespective of distributions from the U.S. LP, and the character and source of the item of income in the hands of the Japanese partners are determined as if such items were realized directly from the source from which realized by the U.S. LP, provided that the U.S. LP has not made an election to be classified as an association taxable as a corporation for U.S. federal income tax purposes. 

と述べて，最後に日米租税条約の適用ありとしている。

[2017/02/14追記]
大石・栗原・山田の3氏がこのnewsletterで検討。また、このブログもすでに検討。