§186.  Revocable trusts

Where at any time during the taxable year the power to revest in the grantor title to any part of the corpus of the trust is vested either:

(1)  In the grantor, either alone or in conjunction with any person not having a substantial adverse interest in the disposition of such part of the corpus or the income therefrom, or

(2)  In any person not having a substantial adverse interest in the disposition of such part of the corpus or the income therefrom, then the income of such part of the trust for such taxable year shall be included in computing the net income of the grantor.