CiteTax
Guides
Explainers on how U.S. income tax actually works — brackets, withholding, deductions, and filing mechanics — grounded in IRS publications and state revenue department guidance, not approximations. Every guide links to the CiteTax calculator that lets you run the numbers yourself.
Your income isn't taxed at one flat rate — it moves through brackets, and only the slice inside each bracket gets that bracket's rate. Worked with real 2025 numbers.
Read guide →State TaxFlat Tax vs. Bracket States: Why Identical Incomes Owe Different State TaxFlat-rate states tax every dollar the same; bracket states scale up like the federal system. Worked with Colorado and California at $80,000 and $300,000 for 2025.
Read guide →Withholding & PlanningHow to Fill Out a W-4 So Your Withholding Matches What You OweThe current Form W-4 doesn't use allowances — it feeds dollar amounts into the IRS Publication 15-T Percentage Method. Worked with a real biweekly paycheck.
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