Mastering Personal Income Tax and Deductions

Andrew's Tax Scenario

• It reduces Andrew's taxable income by $12,000, which in turn reduces his federal income taxes owed.
• It reduces Andrew's total federal income tax liability dollar-for-dollar by $2,200.
• Andrew will receive a tax refund of approximately $2,300 from the federal government.
• $81,900
• Only the portion of Andrew's taxable income that falls within the 22% bracket range is taxed at that rate.

Essential Tax Formulas

• Taxable Income = Gross Income − pre-tax contributions (401(k)/403(b), HSA, 529) − standard or itemized deduction
• Net Income = Gross Pay − mandatory − optional − involuntary deductions
• Effective Tax Rate = (Total Tax Paid ÷ Taxable Income) × 100
• Refund/Owe = Amount Withheld − Final Tax Liability (positive = refund)
• Net Worth = Total Assets − Total Liabilities

Tax Calculation Order of Operations

• Gross Income → subtract deductions → Taxable Income → apply brackets → Tax Liability → subtract credits → Final Tax Owed → subtract withholding → Refund or Owe

Deductions vs. Credits

• A deduction reduces taxable income before tax is calculated.
• A credit reduces final tax owed, dollar-for-dollar, after tax is calculated.
• A $1,500 credit saves $1,500; a $1,500 deduction saves $1,500 × your rate.
• Deduction examples: 401(k), HSA, standard deduction, mortgage interest, charitable donations.
• Credit examples: Child Tax Credit ($2,200/child), Education Credit ($2,500/student), Clean Energy Credit.
• Take the standard deduction ($16,100 Single) or itemized, whichever is bigger.

Understanding Tax Rates

• Marginal Rate: The rate on your next dollar earned (your top bracket).
• Effective Rate: The average rate across all income.
• Marginal is almost always higher than effective.
• Progressive Tax: The average rate rises as income rises.
• Only dollars inside a bracket get that bracket's rate — nobody pays 37% on everything.

Common Types of Taxes

• Income tax: A percentage of income paid to the government, withheld from paychecks.
• Payroll tax: Funds Social Security and Medicare.
• Property tax: Based on the value of houses, land, and cars.
• Sales tax: Based on purchase price, collected by the seller.
• Capital gains: Profit from selling an asset for more than you paid.
• Short-term gains (held < 1 year): Taxed as regular income.
• Long-term gains (held > 1 year): Lower rates (0%, 15%, 20%).