Example (1). Under the terms of a trust created by A the trustee is directed to pay the net income to B, so long as B shall live. The trustee is authorized in his discretion to withhold payments of income during any period he deems advisable and add such income to the trust corpus. Since B's right to receive the income payments is subject to the trustee's discretion, it is not a present interest and no exclusion is allowable with respect to the transfer in trust.
Example (2). C transfers certain insurance policies on his own life to a trust created for the benefit of D. Upon C's death the proceeds of the policies are to be invested and the net income therefrom paid to D during his lifetime. Since the income payments to D will not begin until after C's death the transfer in trust represents a gift of a future interest in property against which no exclusion is allowable.
Example (3). Under the terms of a trust created by E the net income is to be distributed to E's three children in such shares as the trustee, in his uncontrolled discretion deems advisable. While the terms of the trust provide that all of the net income is to be distributed, the amount of income any one of the three beneficiaries will receive rests entirely within the trustee's discretion and cannot be presently ascertained. Accordingly, no exclusions are allowable with respect to the transfers to the trust.
Example (4). Under the terms of a trust the net income is to be paid to F for life, with the remainder payable to G on F's death. The trustee has the uncontrolled power to pay over the corpus to F at any time. Although F's present right to receive the income may be terminated, no other person has the right to such income interest. Accordingly, the power in the trustee is disregarded in determining the value of F's present interest. The power would not be disregarded to the extent that the trustee during F's life could distribute corpus to persons other than F.
Example (5). The corpus of a trust created by J consists of certain real property, subject to a mortgage. The terms of the trust provide that the net income from the property is to be used to pay the mortgage. After the mortgage is paid in full the net income is to be paid to K during his lifetime. Since K's right to receive the income payments will not begin until after the mortgage is paid in full the transfer in trust represents a gift of a future interest in property against which no exclusion is allowable.
Example (6). L pays premiums on a policy of insurance on his life, all the incidents of ownership in the policy (including the right to surrender the policy) are vested in M. The payment of premiums by L constitutes a gift of a present interest in property.
26 C.F.R. §25.2503-3