They increased the tax from 6% on the dollar to 7% on the dollar. That equals to a 1% increase on the dollar. The way the pro-income taxers are spinning it is by saying they increased the tax rate of .06 17% to .07.
Instead of them calculating it by the dollar amount, what they're doing is figuring from the current tax rate of 6% to the 7% that will take effect on the 15th. Get your calculator and divide 1 by 6 and it will come up .166 which they're rounding up to .17, or add 17% to .06 and it will come up to .070 which is what the new rate will be. Mathematically they're correct, but the only reason they're saying a 17% increase in the tax rate instead of a 1% increase in the amount in relation to the dollar is that it sounds sinister.