For purposes of any city income tax surcharge imposed pursuant to the authority of this article:
For the purposes of the foregoing, a trust or a portion of a trust is revocable if it is subject to a power, exercisable immediately or at any future time, to revest title in the person whose property constitutes such trust or portion of a trust and a trust or portion of a trust becomes irrevocable when the possibility that such power may be exercised has been terminated.
N.Y. Tax Law § 1325