How does progressive taxation actually work if I get a raise into a new bracket?

The U.S. system is progressive, which means only the dollars that fall inside a higher bracket are taxed at that higher rate, not your whole income. Suppose a raise pushes your last few thousand dollars into the 22% bracket. Only those specific dollars are taxed at 22%; everything below still gets taxed at 10%, 12%, and so on. You never take home less money by earning more, a fear the IRS bracket tables make clear once you see them stacked. The one nuance is that extra income can phase out certain credits or push you past income thresholds, but the base income tax itself never works against you. To see how a raise flows through your take-home pay, try the W-2 Optimizer at wealthserene.com/tools/w2-optimizer.