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Financial Glossary
The marginal tax rate is the tax rate applied to the last dollar of income earned. In a progressive tax system, income is taxed in brackets at increasing rates. Your marginal tax rate is the rate of the highest bracket your income reaches, and it only applies to the portion of income within that bracket, not your entire income.
The marginal tax rate is one of the most misunderstood tax concepts. Many people mistakenly believe their entire income is taxed at their marginal rate, leading to the misconception that a raise could actually reduce net income by pushing them into a higher bracket. In reality, only the portion of income within each bracket is taxed at that bracket's rate. The marginal rate is crucial for decision-making because it determines the tax impact of earning additional income — whether from a raise, bonus, side business, or selling investments. It also determines the tax benefit of additional deductions, as each dollar of deduction saves taxes at your marginal rate.
Your marginal tax rate directly affects the net value of salary increases, bonuses, and additional income. If you are in the 32% marginal bracket, a $10,000 raise yields only $6,800 after federal taxes (excluding state taxes). This does not mean the raise is not worthwhile — it simply means you should know the net impact. Marginal rate also affects decisions about retirement contributions (which save taxes at your marginal rate), Roth vs. traditional IRA choices, and when to realize capital gains or losses.
For 2025-2026, a single filer earning $75,000 falls into the 22% marginal tax bracket. However, only income above $47,150 is taxed at 22%. The first $11,600 is taxed at 10%, and income from $11,601 to $47,150 is taxed at 12%. The overall effective tax rate is lower than 22%.
No. In a progressive tax system, only the portion of income within each bracket is taxed at that bracket's rate. Your entire income is not taxed at your marginal rate. This is a common misconception.
Knowing your marginal rate helps with financial planning decisions, such as whether to work overtime (you know what portion of extra income goes to taxes), contribute to retirement accounts (tax savings at your marginal rate), or realize capital gains.
No. Only the income within the new bracket is taxed at the higher rate. You always keep more money after a raise, though the incremental gain is smaller than the gross raise amount. This is sometimes called the 'tax bracket myth'.
State income taxes add to your overall marginal rate. If you are in a 22% federal bracket and a 5% state bracket, your combined marginal rate is 27%. This higher combined rate should be used for financial planning decisions like evaluating additional income or deductions.
For 2025-2026, the highest federal marginal tax rate is 37% for income over $609,350 (single filers). With the additional 3.8% Net Investment Income Tax and state taxes, top marginal rates can exceed 50% in high-tax states like California and New York.
United Kingdom calculators use data from the following official government agencies:
Our UK calculators use tax bands, National Insurance rates, and contribution limits published by HMRC. Salary and economic data comes from the Office for National Statistics (ONS). Mortgage calculations use average UK interest rates and may vary by lender and individual circumstances. All figures are for educational purposes.
All tax brackets, contribution rates, and economic data used in our calculators are sourced from the official government publications listed above. Rates are updated at least annually to reflect the latest tax year and regulatory changes. Users should verify critical figures with official sources or qualified professionals.
Last updated: June 2026. Information may change; always verify with official sources.
Last Updated: July 2026 — Reviewed Against Official Sources
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