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finance 2025-02-03

Tax Brackets Explained: How Progressive Taxation Really Works

Understand how tax brackets work, why moving to a higher bracket does not mean all your income is taxed more.

One of the biggest tax misconceptions: "If I earn more, I will lose money because of a higher tax bracket." This is wrong.

How Progressive Taxation Works

In a progressive system, different portions of your income are taxed at different rates. Only the income WITHIN each bracket is taxed at that bracket's rate.

Example (simplified)

BracketRate

|---------|------|

$0 – $10,00010% $10,001 – $40,00020% $40,001 – $85,00030% $85,001+40%

If you earn $50,000:

  • First $10,000 × 10% = $1,000
  • Next $30,000 × 20% = $6,000
  • Last $10,000 × 30% = $3,000
  • Total tax: $10,000 (effective rate: 20%)

If you earn $50,001 (one dollar more):

  • You pay $10,000.40 in tax — only 40 cents more, NOT $20,000 (40% of everything)

Marginal vs Effective Tax Rate

  • Marginal rate: The rate on your LAST dollar earned
  • Effective rate: Your total tax divided by total income

Your effective rate is ALWAYS lower than your marginal rate.

Korean Income Tax Brackets (2024)

Taxable IncomeRate

|---------------|------|

Up to ₩14M6% ₩14M – ₩50M15% ₩50M – ₩88M24% ₩88M – ₩150M35% ₩150M – ₩300M38% ₩300M – ₩500M40% ₩500M – ₩1B42% Over ₩1B45%

Tax-Saving Strategies

1. Maximize deductions: Reduce your taxable income

2. Retirement contributions: Tax-deferred growth

3. Tax credits: Directly reduce tax owed

4. Income timing: Defer income to lower-tax years when possible

Use our percentage calculator to quickly compute your effective tax rate.