reduced by any amounts paid, credited, or required to be distributed in such taxable year other than those amounts considered paid or credited in a preceding taxable year by reason of section 663(b) and this section. An election shall be made for each taxable year for which the treatment is desired. The application of this paragraph may be illustrated by the following example:
Example. X Trust, a calendar year trust, has $1,000 of income (as defined in § 1.643(b)-1 ) and $800 of distributable net income (as defined in §§ 1.643(a)-1 through 1.643(a)-7 ) in 1972. The trust properly pays $550 to A, a beneficiary, on January 15, 1972, which the trustee elects to treat under section 663(b) as paid on December 31, 1971. The trust also properly pays to A $600 on July 19, 1972, and $450 on January 17, 1973. For 1972, the maximum amount that may be elected under this subdivision to be treated as properly paid or credited on the last day of 1972 is $400 ($1,000-$600). The $550 paid on January 15, 1972, does not reduce the maximum amount to which the election may apply, because that amount is treated as properly paid on December 31, 1971.
26 C.F.R. §1.663(b)-1