What is the difference between my marginal and effective tax rate?

The marginal rate is the tax on your next dollar; the effective rate is your whole tax divided by your income. In the example the marginal federal rate is 22.2% and the effective federal rate is 2.2% of total income (5.8% of taxable income).

Why is my marginal rate higher than my tax bracket?

Because the next dollar can pull other income into tax: up to 85 cents of Social Security per dollar (Pub. 915), long-term gains pushed from the 0% rate to 15%, or a deduction that phases out. In the example the next $1,000 of IRA income makes $850 of Social Security taxable, so it costs $222 in the 12% bracket.

How is the effective tax rate calculated here?

Federal tax (Form 1040 line 24) divided by your total income: every dollar you enter, including the Social Security that is not taxable. The calculator also shows the tax as a share of taxable income and the state tax as a share of total income.

How much more income can I add before the next bracket?

The room in your bracket. In the example $26,509 of Roth conversion still fits in the 12% bracket in 2026, and converting it adds $5,934 of federal tax. Income counts in the year it is received, so the room for 2026 ends on December 31.

Does the calculator include state income tax?

Yes: pick your state and it adds the state tax, the state’s effective rate and its marginal rate on the next $1,000, from QuantCalc’s state engine. In the example North Carolina takes $768 and its marginal rate is 3.99%.

Tax Bracket Calculator 2026: What Tax Bracket Am I In?

Enter your 2026 income. The tax engine works out your federal tax bracket, your real marginal rate (what the next dollar costs once the Social Security it makes taxable and any gains it pushes out of the 0% rate are counted), your effective federal and state tax rate, and how much more income fits in your bracket before December 31.

Looking for the bracket table itself? It is on 2026 tax brackets. Filling the bracket with a Roth conversion? The Roth conversion calculator sizes it against IRMAA and the ACA too.

What tax bracket am I in, and what is my real tax rate?

Your bracket is the rate on the last dollar of your taxable ordinary income (income after the deduction, without long-term gains and qualified dividends, which have their own 0%, 15% and 20% rates), read from the 2026 brackets (Rev. Proc. 2025-32). Two other rates matter more for a decision. Your marginal rate is what the next dollar actually costs: the engine measures it by adding $1,000 of IRA income, so it counts the Social Security that dollar makes taxable (IRC §86), gains it pushes from the 0% rate to 15% and deductions that phase out. Your effective rate is the tax divided by your total income. Example: a single 68-year-old in North Carolina with $30,000 of Social Security, $20,000 of IRA withdrawals, $2,000 of interest and a $10,000 long-term gain has $23,400 of taxable income and is in the 12% bracket, but the next $1,000 of IRA income costs $222 of federal tax, a marginal rate of 22.2%, because it also makes $850 more of their Social Security taxable. Their federal tax is $1,363, an effective rate of 2.2% of their $62,000 of total income.

The worked example, computed by the tax engine: single, age 68, North Carolina, $30,000 Social Security, $20,000 IRA withdrawals, $2,000 interest, $10,000 long-term gain ($62,000 of total income) in 2026.
Key number	2026
Taxable income (ordinary + long-term gain) (standard deduction)	$23,400
… of which ordinary income (sets the bracket) (Rev. Proc. 2025-32)	$13,400
Social Security that is taxable (Pub. 915)	$15,550
Federal tax (Tax Table)	$1,363
Effective federal rate (tax ÷ total income)	2.2%
Federal tax ÷ taxable income	5.8%
Federal tax on the next $1,000 of IRA income	$222
Marginal federal rate (§86)	22.2%
North Carolina tax (North Carolina rules)	$768
Effective North Carolina rate (tax ÷ total income)	1.2%
Effective federal + state rate	3.4%
Room left in the 12% bracket	$26,509
Federal tax on converting that room	$5,934

Your bracket is one line of the return. Your whole 2026 return — Social Security, IRA money, pensions, gains, the deductions, your state and what you have paid — ends in a refund or an amount owed: 2026 tax return calculator (free: your federal and state refund or amount owed) →

An estimate from QuantCalc’s open tax engine (federal 2.3.1, state 1.14.2) for the 2026 tax year. Not tax advice: your return depends on facts this page does not ask about, so check a move with your tax preparer or custodian before acting. How the engine computes each line, with its official source: federal, state.

Run your own numbers in the calculator below.

Find your bracket and your real tax rate

Filing status Your age on Dec 31, 2026 State

Your 2026 income (the whole year)

Wages ($) Pension or annuity ($) Social Security ($)Gross benefits IRA / 401(k) withdrawals ($)Including RMDs Roth conversions so far ($) Taxable interest ($) Dividends, total ($)Box 1a of your 1099-DIVs … of which qualified ($)Box 1b Net long-term capital gains ($) Net short-term capital gains ($)

The standard deduction (with the extra amounts at 65 and the deduction for taxpayers 65 and older) is applied by the engine. Itemizing, credits for children and self-employment income are not asked here; the 2026 tax return calculator takes the whole return.

Example — enter your numbers

Why is my marginal tax rate higher than my bracket?

In the example the next $1,000 of IRA income is taxed at 12%, and it also makes $850 of Social Security taxable at 12%: $222 in all, a 22.2% marginal rate in the 12% bracket. Between the two Social Security thresholds each extra dollar makes 50 cents more of the benefits taxable, and above the second one 85 cents, until 85% of the benefits are taxable (Pub. 915): in that range the marginal rate is 1.85 times the bracket rate. The same next dollar can move a long-term gain from the 0% rate to 15% once taxable income passes the top of the 0% band (Rev. Proc. 2025-32), and it can shrink the deduction for taxpayers 65 and older above its phase-out threshold (IRC §151). In the example the gain still has $16,100 of room at 0%, so the next $1,000 does not reach it. North Carolina’s marginal rate on the same $1,000 is 3.99% (North Carolina rules).

How much room is left in my bracket before December 31?

The room is how much more ordinary income fits before your taxable income crosses into the next bracket, found by adding income until it does, so the Social Security it makes taxable is counted. In the example $26,509 of Roth conversion fits in the 12% bracket; converting it by December 31 adds $5,934 of federal tax (22.4% of the conversion) and $1,058 of North Carolina tax. A conversion counts in the year the money leaves the traditional IRA, so 2026’s room is gone on January 1.

Common questions

What tax bracket am I in?: The bracket of your taxable ordinary income: your income after the standard or itemized deduction, without long-term gains and qualified dividends. For 2026 the federal rates are 10%, 12%, 22%, 24%, 32%, 35% and 37% (Rev. Proc. 2025-32). A single 68-year-old with $30,000 of Social Security, $20,000 of IRA withdrawals, $2,000 of interest and a $10,000 gain has $13,400 of taxable ordinary income: the 12% bracket.
What is the difference between my marginal and effective tax rate?: The marginal rate is the tax on your next dollar; the effective rate is your whole tax divided by your income. In the example the marginal federal rate is 22.2% and the effective federal rate is 2.2% of total income (5.8% of taxable income).
Why is my marginal rate higher than my tax bracket?: Because the next dollar can pull other income into tax: up to 85 cents of Social Security per dollar (Pub. 915), long-term gains pushed from the 0% rate to 15%, or a deduction that phases out. In the example the next $1,000 of IRA income makes $850 of Social Security taxable, so it costs $222 in the 12% bracket.
How is the effective tax rate calculated here?: Federal tax (Form 1040 line 24) divided by your total income: every dollar you enter, including the Social Security that is not taxable. The calculator also shows the tax as a share of taxable income and the state tax as a share of total income.
How much more income can I add before the next bracket?: The room in your bracket. In the example $26,509 of Roth conversion still fits in the 12% bracket in 2026, and converting it adds $5,934 of federal tax. Income counts in the year it is received, so the room for 2026 ends on December 31.
Does the calculator include state income tax?: Yes: pick your state and it adds the state tax, the state’s effective rate and its marginal rate on the next $1,000, from QuantCalc’s state engine. In the example North Carolina takes $768 and its marginal rate is 3.99%.