If the taxable year of a beneficiary is different from that of the estate or trust, the amount which he is required under R.S. 47:182 B to include in computing his net income, shall be based upon the income of the estate or trust for any taxable year of the estate or trust, whether beginning on, before, or after January 1, 1948, ending within his taxable year.
La. Revenue and Taxation § 47:184