Progressive Brackets: The Stair-Step System
The United States uses a progressive federal income tax system — as your income rises, higher portions of it are taxed at higher rates. The key insight that most people misunderstand: you do NOT pay your top tax rate on all your income. You pay each rate only on the income within that bracket. Think of it as a staircase: the first step (lowest bracket) fills first, then the second step, then the third. For 2024 (single filer), the brackets are approximately: 10% on income $0–$11,600; 12% on $11,601–$47,150; 22% on $47,151–$100,525; 24% on $100,526–$191,950; 32% on $191,951–$243,725; 35% on $243,726–$609,350; 37% on income over $609,350. A single filer earning $80,000 pays: 10% on the first $11,600 = $1,160; 12% on the next $35,550 ($47,150−$11,600) = $4,266; 22% on the remaining $32,850 ($80,000−$47,150) = $7,227. Total tax = $12,653. Marginal rate = 22% (the rate on the last dollar earned). Effective rate = $12,653 / $80,000 = 15.8% (actual percentage of total income paid as tax). These are federal rates. State income taxes (zero in Florida, Nevada, Texas, etc.; up to 13.3% in California) are added separately.