Tennessee Code Title 67. Taxes and Licenses § 67-1-106

(a) Upon written request, the commissioner has the discretion to authorize a person to file tax returns and pay taxes collectible by the department on an optional reporting period that is either shorter or not more than seven (7) days longer than the regular statutory reporting period provided by law. An optional reporting period must conform to the accounting period used by the taxpayer in the taxpayer's books of account.

(b) A tax return and payment for an optional reporting period shall become delinquent if not filed or paid before that date that is the same number of days after the close of the optional reporting period as the regular statutory delinquency date is after the close of the regular reporting period. If an optional reporting period tax return or payment becomes delinquent, penalty and interest calculated under the regular statutory methods and rates shall be payable from the date of delinquency.

(c) A person authorized to use an optional reporting period shall continue on that basis until such person notifies the commissioner of an intention to revert to the regular statutory reporting period, or receives authorization from the commissioner to use a different optional reporting period. A person who elects to file tax returns and make payments on an optional reporting basis period shall be required to use that period for reporting and paying all taxes collectible from such person by the department.