A. Estimated Expendable Budget: The city council shall not make any appropriation in the final budget of any fund in excess of the estimated expendable revenue for the budget year of such fund.
B. Determination: In determining the estimated expendable revenue of the general fund for the budget year, there shall be included therein as an appropriation from surplus, that portion of the unappropriated surplus account of said fund at the close of the last completed fiscal year, not previously included in the budget of the current year, which exceeds an amount equal the sum of:
1. Fifty percent (50%) of estimated revenue of said fund from property and sales taxes in a budget year, as determined before such appropriation from surplus; and
2. Ten percent (10%) of total actual revenue for the last completed fiscal year. This provision shall apply only to the budget of the general fund in the city.
C. Existing Deficit: There shall be included as an item of appropriation in each fund for any budget year any existing deficit as of the close of the last completed fiscal year not previously included in the budget of the current year to the extent of the last five percent (5%) of the total revenue of such fund in such last completed fiscal year; provided, however, if the total amount of the deficit is less than five percent (5%) of the total revenue in said last competed fiscal year, the entire amount of such deficit shall be included. This provision shall apply to the budgets of all funds which require budgets. (1966 Code § 2-1-4)