TN 16 (09-24)
A period of less than 12 months may be a taxable year if:
The basis for computing and reporting income changes, e.g., fiscal to calendar year, or
The taxpayer dies, (the taxable year ends on the date of death, and net earnings are computed as of the date of death.)
The taxable year is closed by the Commissioner of IRS.
An individual's taxable year is not ended by them going out of business.