La. R.S. 47:287.444 — Returns for a period of less than twelve months, special tax computation

A. When a separate return for a period of less than twelve months is required by law, or permitted by the secretary pursuant to this Part, Louisiana taxable income of a corporation shall be computed on the basis of such period.
B. When Louisiana taxable income is computed on the basis of a period of less than twelve months, it shall be placed on an annual basis by multiplying the amount thereof by twelve and dividing by the number of months included in the period for which the separate return is required or permitted to be made. The tax shall be such part of the tax computed on such annual basis as the number of months in such period is of twelve months.