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Taxes 101 — Income Tax Terms for Beginners

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Gross income vs. net income
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Gross is what you earn before deductions; net (take-home) is what's left after taxes and other withholdings.
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W-2
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The form an employer sends showing your annual wages and the taxes withheld. Used to file your return.
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1099
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A form reporting income you earned as a contractor or from non-employer sources. No taxes are withheld, so you may owe at filing.
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Withholding
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The portion of each paycheck your employer sends to the government toward your income taxes in advance.
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Tax deduction
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An amount subtracted from your taxable income, lowering the income you're taxed on (e.g., the standard deduction).
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Tax credit
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A dollar-for-dollar reduction of the tax you owe. Credits are more valuable than deductions of the same amount.
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Deduction vs. credit
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A deduction reduces taxable income; a credit reduces the tax bill directly. A $1,000 credit saves you $1,000; a $1,000 deduction saves only your tax rate times $1,000.
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Marginal tax bracket
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The rate applied to your last dollar of income. The U.S. uses progressive brackets — higher income is taxed at higher rates.
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Progressive tax myth
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Moving into a higher bracket does NOT tax all your income at that rate — only the income above each bracket's threshold is taxed at the higher rate.
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Effective tax rate
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The average rate you actually pay across all your income — always lower than your top marginal rate.
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Standard vs. itemized deduction
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You take whichever is larger: a flat standard deduction, or the sum of specific itemized deductions (like mortgage interest and charitable gifts).
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Taxable income
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Your income after deductions — the number your tax is actually calculated on.
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Tax refund
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Money returned to you when you had more withheld than you owed. A big refund means you gave the government an interest-free loan.
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FICA taxes
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Payroll taxes for Social Security and Medicare, split between you and your employer.
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Filing status
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Your category for tax purposes (single, married filing jointly, head of household, etc.), which affects your brackets and deduction.
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Adjusted Gross Income (AGI)
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Your gross income minus certain adjustments. Many tax benefits phase in or out based on your AGI.
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