Exactly, or that's how it was explained to me. Say you get a 10k raise from 94k to 104k and the next bracket is at 100k. If your old percent was 20% and the 100k bracket is 25% only the "extra" 4k would be taxed at 25% and the 6k before that would be 20%.

Or so I've been told by smarter people than me. Numbers/ brackets and percentages are all made up to make it easier.

Midwest, US if it matters.