26 C.F.R. § 26.2653-1
Example 1. T transfers property to an irrevocable trust for the benefit of T's grandchild, GC, and great-grandchild, GGC, During GC's life, the trust income may be distributed to GC and GGC in the trustee's absolute discretion. At GC's death, the trust property passes to GGC. Both GC and GGC have an interest in the trust for purposes of chapter 13. The transfer by T to the trust is a direct skip, and the property is held in trust immediately after the transfer. After the direct skip, the transferor is treated as being one generation above GC, the highest generation individual having an interest in the trust. Therefore, GC is no longer a skip person and distributions to GC are not taxable distributions. However, because GGC occupies a generation that is two generations below the deemed generation of T, GGC is a skip person and distributions of trust income to GGC are taxable distributions.
Example 2. T transfers property to an irrevocable trust providing that the income is to be paid to T's child, C, for life. At C's death, the trust income is to be accumulated for 10 years and added to principal. At the end of the 10-year accumulation period, the trust income is to be paid to T's grandchild, GC, for life. Upon GC's death, the trust property is to be paid to T's great-grandchild, GGC, or to GGC's estate. A GST occurs at C's death. Immediately after C's death and during the 10-year accumulation period, no person has an interest in the trust within the meaning of section 2652(c) and § 26.2612-1(e) because no one can receive current distributions of income or principal. Immediately after C's death, T is treated as occupying the generation above the generation of GC (the trust beneficiary in existence at the time of the GST who then occupies the highest generation level of any person who may subsequently hold an interest in the trust). Thus, subsequent income distributions to GC are not taxable distributions.
26 C.F.R. §26.2653-1