IRC Sec.643(b)'s definition of income would be revised to take into account changes in how a state's laws define trust accounting income. Potentially affected are charitable remainder trusts, pooled income funds, trusts that qualify for gift and estate tax marital deductions, trusts exempt from generation-skipping transfer taxes and other trusts. The proposed regs also specify when capital gains are included in distributable net income. A hearing is scheduled for June 8 and comments are due by May 18.