Finance
2 min read

Tax Bracket

A range of income taxed at a specific marginal rate under a progressive income-tax system. Earning into a higher bracket only taxes the additional income at the higher rate, not the entire income.

How tax brackets work

The basic structure:

  • Income divided into ranges (brackets).
  • Each bracket has its own marginal rate.
  • Rates apply only to income within that bracket — not all your income.
  • Higher income → higher marginal rates.

This is called a progressive tax system. Most developed economies use brackets.

Marginal vs. effective rate

Critical distinction:

  • Marginal rate — rate on your next dollar of income.
  • Effective rate — total tax divided by total income; lower than marginal.
  • Misunderstanding — many believe their entire income is taxed at marginal rate. It's not.

For example: with US 2026 brackets, a $100k earner has marginal rate around 24% but effective rate around 17%.

US federal brackets

Current structure (approximate, single filer):

  • 10% on first ~$11k.
  • 12% on next portion.
  • 22%, 24%, 32%, 35%, 37% on subsequent ranges.

Brackets adjust annually for inflation. State income tax adds on top.

Why brackets matter

Several practical implications:

  • Marginal decisions — extra income is taxed at marginal rate.
  • Bracket strategy — defer income into lower-bracket years if possible.
  • Roth conversions — convert to Roth IRA in low-income years.
  • Tax-loss harvesting — offset gains taxed at higher brackets first.

Understanding marginals enables better tax planning.

Common misunderstandings

Frequent errors:

  • "I'll move to the next bracket and lose money" — false; only the income in the new bracket pays the higher rate.
  • "My bonus is taxed higher" — withholding may be flat-rate, but final tax is based on total income.
  • "Brackets matter for capital gains" — long-term capital gains tax has its own brackets.

These misunderstandings affect decision-making.

What individuals should know

Practical takeaways:

  • Know your marginal rate — guides decisions on extra work, retirement contributions, etc.
  • Know your effective rate — the actual percentage you pay.
  • Brackets adjust annually — check current tables.
  • State taxes add to federal — total marginal rate can exceed 50% in high-tax states.

Tax brackets are foundational to understanding personal taxation. Many financial decisions are better made with marginal-rate thinking.