Progressive Tax Systems, Simply Explained

Many countries use a progressive tax system, where the tax rate increases as income increases. But the common misconception is that earning more can suddenly tax your entire income at a higher rate. That's not how it actually works — a progressive system taxes different slices of your income at different rates, not your whole income at one single rate.

Here's a simplified, illustrative example (not real rates from any country): imagine income up to $20,000 is taxed at 10%, the next slice from $20,000 to $50,000 is taxed at 20%, and anything above $50,000 is taxed at 30%. Someone earning $60,000 doesn't pay 30% on the whole $60,000 — they pay 10% on the first $20,000, 20% on the next $30,000, and 30% only on the last $10,000.

Illustrative brackets:
  10% on the first $20,000
  20% on $20,000–$50,000
  30% above $50,000

Someone earning $60,000:
  10% × $20,000 = $2,000
  20% × $30,000 = $6,000
  30% × $10,000 = $3,000
  ------------------------
  Total tax = $11,000

In a progressive tax system, different ____ of income are taxed at different rates, not the entire income at one rate.

In the illustrative example above, why doesn't someone earning $60,000 pay 30% on the entire $60,000?

A raise that pushes part of your income into a higher tax bracket means your entire income suddenly gets taxed at that higher rate.