Marginal vs Effective Tax Rate: What Is the Difference?

A taxpayer’s marginal tax rate is the percentage paid on the last dollar of income; the effective tax rate is the total tax bill divided by total income—and the effective rate is almost always lower because earlier dollars of income are taxed at lower rates under a progressive system.

A concrete example

Suppose you are a single filer in the US federal system in 2025 with $75,000 of taxable income. The progressive tax brackets are roughly:

• 10% on income from $0 to $11,000
• 12% on income from $11,000 to $44,725
• 22% on income from $44,725 to $95,375
• (and higher brackets above $95,375)

Your tax bill:

• First $11,000 at 10% = $1,100
• Next $33,725 ($44,725 − $11,000) at 12% = $4,047
• Next $30,275 ($75,000 − $44,725) at 22% = $6,661
• Total tax: $11,808

Effective rate: $11,808 ÷ $75,000 = 15.7%

Marginal rate: 22% (the bracket applied to your last dollar)

Your effective rate is 15.7%, but if you earned one more dollar, it would be taxed at 22%. This is why your marginal rate—22%—is higher than your effective rate—15.7%.

Why marginal rate matters for decisions

When you are deciding whether to take on a side project, accept a raise, or defer income, you should think in terms of your marginal rate, not your effective rate. If you earn an extra $10,000 and your marginal rate is 22%, you will take home roughly $7,800 after federal tax (ignoring FICA and state taxes for simplicity). Your effective rate of 15.7% is irrelevant to this calculation; it describes what you have already paid, not what the next dollar costs.

Businesses and investors use marginal tax rate to decide whether a transaction is worthwhile. If a capital gain will trigger a 20% long-term capital gains tax at your marginal bracket, you need the gain to exceed 20% to break even. The effective rate tells you your historical burden; the marginal rate tells you the cost of action.

Effective rate: the true burden

Effective rate is useful for understanding fairness in the tax system and comparing burden across income groups. A high-income earner with a 25% effective rate pays a larger share of income in absolute dollars than a middle-income earner with a 15% effective rate, even though both are in the same progressive system.

Policy makers often cite effective rates to argue whether a tax system is truly progressive. If effective rates are nearly flat across income levels, the system is regressive in practice. If effective rates rise sharply with income, the system is steeply progressive.

The state and federal layering

Federal income tax is only part of the picture. Many states impose their own income tax with their own brackets. The marginal rate that truly affects your next dollar of income is the sum of your federal marginal rate, your state marginal tax rate, and (if applicable) local taxes.

A resident of California earning $100,000 faces a federal marginal rate of 22%, a state marginal rate of 9.3%, and possibly a local tax. Their combined marginal rate approaches 32%. But their effective rate across all taxes combined is much lower—perhaps 20%—because the lower brackets apply to the bulk of their income.

Capital gains and qualified dividends

Long-term capital gains and qualified dividends are often taxed at preferential rates (0%, 15%, or 20% federally) separate from your ordinary income brackets. This creates a separate marginal rate for gains. You might have an ordinary marginal rate of 22%, but a capital gains marginal rate of 15%.

When you realize a capital gain, the effective rate on that gain alone is usually higher than your effective rate on salary, because gains are often realized in lump sums. But the gain is taxed at a lower marginal rate than ordinary income, which is why investors prefer capital gains to salary.

Marginal rate creep and phase-outs

As income rises, you may enter higher brackets. Additionally, some credits and deductions phase out at higher income levels, creating implicit marginal rates. If you earn one more dollar and lose a $0.30 child tax credit phase-out, your true marginal rate is your bracket rate plus 0.30%. This can lead to marginal rates above 50% in certain income ranges—a reason high-income earners pay close attention to the exact marginal rate on incremental income.

Calculating your effective rate quickly

Simply divide total federal tax paid by total taxable income. You do not need to remember the brackets. If you filed a return and owed $15,000 on $90,000 of taxable income, your effective rate is 16.7%. That is the true percentage of your income that went to federal tax, regardless of brackets.

See also