Tax Calculator FAQs
What are the 2025 federal income tax brackets? ▼
For single filers: 10% on $0–$11,925 | 12% on $11,925–$48,475 | 22% on $48,475–$103,350 | 24% on $103,350–$197,300 | 32% on $197,300–$250,525 | 35% on $250,525–$626,350 | 37% over $626,350. Standard deduction is $15,000 for single filers in 2025.
How much self-employment tax do I owe? ▼
Self-employment tax is 15.3% (12.4% Social Security + 2.9% Medicare) on 92.35% of your net self-employment income. You can deduct half of SE tax from your income tax. Use our Self-Employment tab for exact amounts.
What is the difference between effective and marginal tax rate? ▼
Marginal rate is the rate on your LAST dollar of income. Effective rate is total tax divided by total income. If you make $75,000 as a single filer, your marginal rate is 22% but your effective rate is only ~13% because lower brackets apply to your first dollars earned.
How is bonus income taxed? ▼
Bonuses are taxed as "supplemental wages." Employers typically withhold 22% flat federal tax on bonuses up to $1 million. However your actual tax is based on your marginal bracket — if you're in the 24% bracket, you may owe a bit more at tax time.