(a) The amounts specified in § 1.652(a)-1 which are required to be included in the gross income of a beneficiary are treated as consisting of the same proportion of each class of items entering into distributable net income of the trust (as defined in section 643(a)) as the total of each class bears to such distributable net income, unless the terms of the trust specifically allocate different classes of income to different beneficiaries, or unless local law requires such an allocation. For example: Assume that under the terms of the governing instrument, beneficiary A is to receive currently one-half of the trust income and beneficiaries B and C are each to receive currently one-quarter, and the distributable net income of the trust (after allocation of expenses) consists of dividends of $10,000, taxable interest of $10,000, and tax-exempt interest of $4,000. A will be deemed to have received $5,000 of dividends, $5,000 of taxable interest, and $2,000 of tax-exempt interest; B and C will each be deemed to have received $2,500 of dividends, $2,500 of taxable interest, and $1,000 of tax-exempt interest. However, if the terms of the trust specifically allocate different classes of income to different beneficiaries, entirely or in part, or if local law requires such an allocation, each beneficiary will be deemed to have received those items of income specifically allocated to him.

(b) The terms of the trust are considered specifically to allocate different classes of income to different beneficiaries only to the extent that the allocation is required in the trust instrument, and only to the extent that it has an economic effect independent of the income tax consequences of the allocation. For example:

(1) Allocation pursuant to a provision in a trust instrument granting the trustee discretion to allocate different classes of income to different beneficiaries is not a specific allocation by the terms of the trust.

(2) Allocation pursuant to a provision directing the trustee to pay all of one income to A, or $10,000 out of the income to A, and the balance of the income to B, but directing the trustee first to allocate a specific class of income to A's share (to the extent there is income of that class and to the extent it does not exceed A's share) is not a specific allocation by the terms of the trust.

(3) Allocation pursuant to a provision directing the trustee to pay half the class of income (whatever it may be) to A, and the balance of the income to B, is a specific allocation by the terms of the trust.