Tennessee Code Title 9. Public Finances § 9-3-506

(2) For any pension plan that is funded below sixty percent (60%), the political subdivision shall not establish a benefit enhancement until it has received written approval by the state treasurer. For the purposes of this subdivision (a)(2), “benefit enhancement” means any change in member benefits, benefit structure, or benefit formula provided by a political subdivision relative to its pension plan that, according to the political subdivision's actuary, will or is estimated to permanently, temporarily, or intermittently increase either the employer or employee contributions or the liabilities of the pension plan; and

(3) For political subdivisions with an existing pension plan as of May 22, 2014, the political subdivision shall not establish a new pension plan that changes the funding policy, increases the employer cost, or adds to the unfunded accrued liability of an existing pension plan until it has received written approval from the state treasurer. For the purposes of this subdivision (a)(3), a political subdivision establishes a new pension plan by taking any or a combination of the following actions:

(c)(1) Notwithstanding any other law, for political subdivision employees hired on or after May 22, 2014, nothing under state law confers to participants in the pension plan an implied right to future retirement benefit arrangements, and such participants may not assert the indefinite continuation of the retirement formulas, contribution rates, eligibility ages, or any other provision of the pension plan.

(2) Subdivision (c)(1) does not affect any judicial precedents or statutory law as they apply to employees who were employed prior to May 22, 2014.