The base maryland rate at the time was 6%. so essentially it doubled the tax rate for high income people. When the law was passed there were a little over 3,000 people in the state that fell into this category and the MD comptroller said "They'll just have to grin and bear it." The following year there were only 1000 people in the state who fell into this category because of moves income shielding ets.
So lets look at what the rapacious greed of maryland politicians yielded. Lets suppose that those over a million had an average actual income of $2 million so they would have paid to the state 3000*.06*$2,000,000 = $360 million. Now look at the result after the plunder tax was passed: 1000*.12*1000= $240 million The greedy thieves in the state legislature (heavily Democrat majority) ended up losing $120 million because the were so stupid as to think that the victims were just going to "grin and bear it."
Interesting how Harpers Ferry home prices keep going up.