(a) Except as provided in sections fourteen-b, twenty-five-a and twenty-six-a of this article, a local fiscal body shall not expend money or incur obligations:
(1) In an unauthorized manner;
(2) For an unauthorized purpose;
(3) In excess of the amount allocated to the fund in the levy order; or
(4) In excess of the funds available for current expenses.
(b) Notwithstanding the foregoing and any other provision of law to the contrary, a local fiscal body or its duly authorized officials may not be penalized for a casual deficit which does not exceed its approved levy estimate by more than three percent: Provided, That such casual deficit is satisfied in the levy estimate for the succeeding fiscal year: Provided, however, That in calculating a deficit for purposes of this section, account shall not be taken of any amount for which the local fiscal body may be liable for the unfunded actuarial accrued liability of the West Virginia Retiree Health Benefit Trust Fund or any amount allocated to the local fiscal body as an employer annual required contribution that exceeds the minimum annual employer payment component of the contribution, all as provided under article sixteen-d, chapter five of this code.