SECTION 1. Section 2 of Chapter 64H of the General Laws, as appearing in the 2016 Official Edition, is hereby amended by inserting after the first sentence, the following sentence:-

This rate shall be lowered to 6.0 per cent starting January 1, 2018, shall be lowered to 5.75 per cent starting January 1, 2019, and shall be lowered to 5.5 per cent starting January 1, 2020.

SECTION 2. Section 1 of Chapter 64A of the General Laws, as appearing, is hereby amended by striking out the definition of “tax per gallon” and inserting in place thereof the following:-

“Tax per gallon”, shall mean the tax determined by the commissioner, for each calendar quarter, and to the nearest tenth of a cent per gallon, which will result in total revenue of sales tax collected under Chapter 64H Section 2 and under Chapter 64A to be the same as if the sales tax under Chapter 64H Section 2 had been 6.25 per cent and the tax per gallon had been 25 cents per gallon, adjusting for cumulative revenue differences in previous quarters; provided, however, that such tax shall not be less than 25 cents per gallon. For aviation fuel, “tax per gallon” shall mean 7 1/2 per cent of the average price, as determined by the commissioner, for each calendar quarter, computed to the nearest tenth of a cent per gallon; provided, however, that such tax shall not be less than 10 cents per gallon.