Financial Basics · Tax Concepts

Tax Brackets

Definition

The US federal income tax uses marginal brackets: each additional dollar of income is taxed at the rate of the bracket it falls into, not the rate of your highest bracket. Your effective (average) rate is always lower than your marginal rate.

Why it matters in retirement

Most people — including most retirees — misunderstand how brackets work. "I don't want a raise, it'll push me into a higher bracket" is one of the most persistent myths in personal finance. Understanding marginal vs effective rates is the foundation of every tax decision in retirement.

Key Numbers — 2026

10% bracket top (MFJ)
$23,850
12% bracket top (MFJ)
$96,950
22% bracket top (MFJ)
$206,700
24% bracket top (MFJ)
$394,600

Pros

  • Progressive — lower earners pay lower effective rates
  • Predictable bracket math enables tax planning
  • Standard deduction is always available

Cons

  • Complex interaction with capital gains, Social Security taxation, IRMAA
  • Bracket thresholds change each year
  • State taxes stack on top

Common mistakes

  • Thinking a higher bracket means ALL income is taxed at that rate
  • Ignoring the phantom brackets created by Social Security taxation
  • Not realizing capital gains stack on top of ordinary income for bracket placement
  • Forgetting that the standard deduction creates a 0% bracket

Related

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