253.5. The amount of abatement is equal to the difference between the amount of real estate taxes that would, but for the abatement, be payable for the fiscal period considered in respect of an eligible unit of assessment and the amount that would be payable if the taxable value of the unit were a fictitious value equal to the taxable value entered on the roll for the preceding fiscal period established under the first two paragraphs of section 253.3, and increased by a percentage corresponding to the threshold of eligibility fixed by the by-law.
Notwithstanding the foregoing, the by-law may provide that, to establish the percentage of increase in the taxable value of the unit of assessment in view of determining whether it is eligible for the abatement for the fiscal year considered and computing the amount of such abatement, the value used, instead of the taxable value entered on the roll for the preceding fiscal year as established under the first two paragraphs of section 253.3, is the fictitious value applicable at the end of that fiscal year, taking into consideration the alterations made to the roll before the coming into force of the roll for the fiscal year considered.
In no case may the second paragraph apply to a unit of assessment for more than three consecutive years.
1987, c. 69, s. 5; 1988, c. 76, s. 72.