253.55. The municipality shall determine three levels, expressed as percentages, on the scale of possible variations in taxable value that may, because of section 253.56, affect the units of assessment subject to the tax.
The scale shall comprise, in order, reductions, from the highest to the lowest, variation nil, and increases, from the lowest to the highest.
The levels determined for the purpose of computing the tax payable for the first fiscal year of the roll also apply for the purpose of computing the amount of the tax payable for the second fiscal year, where applicable.