# Free online 2025-2026 income tax calculator

> Federal income tax is what the IRS takes from your paycheck. This calculator uses official 2025 brackets (for 2025 returns filed in 2026), with an opt-in toggle to add Social Security and Medicare on top.

Estimate your US federal income tax for the 2025-2026 filing season — official 2025 brackets, standard deduction, and an opt-in toggle for Social Security and Medicare (FICA).

**Interactive version:** https://onlinecalculator.me/finance/income-tax/
**Category:** Finance

## How to use

1. Enter your gross income and pick a filing status.
2. If you want the full take-home picture, check **Add Social Security & Medicare (FICA)**. Leave it off for just federal income tax.
3. Switch to **Extended** to add other income, 401(k) contributions, itemized deductions, or a self-employed flag.
4. The breakdown table below the summary cards walks from gross income all the way down to monthly take-home — the same format as the worked example on this page, filled with your numbers.

## 2025 standard deductions

| Filing status | Standard deduction |
|---|---|
| Single | $15,000 |
| Married filing jointly | $30,000 |
| Married filing separately | $15,000 |
| Head of household | $22,500 |
| Qualifying surviving spouse | $30,000 |

## 2025 federal income tax brackets

Each row shows the **upper bound** of the bracket. You only pay a given rate on income that falls **inside** that bracket, not on all your income.

### Single and married filing separately

| Rate | Taxable income up to |
|---|---|
| 10% | $11,925 |
| 12% | $48,475 |
| 22% | $103,350 |
| 24% | $197,300 |
| 32% | $250,525 |
| 35% | $626,350 (single) / $375,800 (MFS) |
| 37% | above the top |

### Married filing jointly and qualifying surviving spouse

| Rate | Taxable income up to |
|---|---|
| 10% | $23,850 |
| 12% | $96,950 |
| 22% | $206,700 |
| 24% | $394,600 |
| 32% | $501,050 |
| 35% | $751,600 |
| 37% | above $751,600 |

### Head of household

| Rate | Taxable income up to |
|---|---|
| 10% | $17,000 |
| 12% | $64,850 |
| 22% | $103,350 |
| 24% | $197,300 |
| 32% | $250,500 |
| 35% | $626,350 |
| 37% | above $626,350 |

## Bracket history — what changed 2024 → 2025

Brackets move up with inflation every year. Below is how the single-filer
thresholds shifted. The rate structure itself has been stable since 2018
(Tax Cuts and Jobs Act); what changes is the dollar threshold where each
rate takes over.

| Rate | 2024 upper bound | 2025 upper bound | Change |
|---|---|---|---|
| 10% | $11,600 | $11,925 | +2.80% |
| 12% | $47,150 | $48,475 | +2.81% |
| 22% | $100,525 | $103,350 | +2.81% |
| 24% | $191,950 | $197,300 | +2.79% |
| 32% | $243,725 | $250,525 | +2.79% |
| 35% | $609,350 | $626,350 | +2.79% |
| 37% | above | above | — |

And the standard deduction by year:

| Filing status | 2024 | 2025 |
|---|---|---|
| Single / MFS | $14,600 | $15,000 |
| Married filing jointly | $29,200 | $30,000 |
| Head of household | $21,900 | $22,500 |

For the Social Security wage base, 2024 was $168,600 and 2025 is $176,100.
IRS publishes the following year's figures every October; 2026 numbers will
be available in fall 2025 and historically rise another 2-3 %.

## How federal tax is calculated

Taxable income = gross income + other income − 401(k) − deduction

Tax is then applied progressively: you pay the bracket rate only on income **within** that bracket, not on all your income.

**Example (single, $75,000 gross, standard deduction):**

- Taxable income: $75,000 − $15,000 = $60,000
- 10% on first $11,925 = $1,192.50
- 12% on $11,925 – $48,475 = $4,386
- 22% on $48,475 – $60,000 = $2,535.50
- **Federal income tax: $8,114**

## FICA (2025)

- **Social Security**: 6.2% on the first **$176,100** of earned income (2025 SSA wage base, up from $168,600 in 2024). Wages above this cap are not taxed for Social Security.
- **Medicare**: 1.45% on all wages, plus an additional 0.9% on wages above $200,000 (single) / $250,000 (married filing jointly).

FICA is **opt-in** in this calculator — flip the toggle above the form to add it to the total.

## Worked example — single filer, $75,000 salary, full breakdown

With the FICA toggle **on**, here's the full 2025 picture on a $75,000 salary:

| Item | Amount |
|---|---|
| Gross income | $75,000 |
| − Standard deduction | −$15,000 |
| = Taxable income | $60,000 |
| Federal income tax | **$8,114** |
| Social Security (6.2% of $75,000) | **$4,650** |
| Medicare (1.45% of $75,000) | **$1,088** |
| **Total federal burden** | **$13,852** |
| After-tax take-home | $61,148 |
| Monthly take-home | $5,096 |

- **Effective tax rate**: 13,852 / 75,000 = **18.5%**
- **Marginal rate**: 22% *(the bracket the next dollar would fall into)*

With the FICA toggle **off**, the same $75,000 shows only $8,114 of federal income tax — a 10.8% effective rate — which is what most people intuitively think of as "my tax".

## Marginal vs. effective rate — why both matter

**Marginal rate** is the tax on the next dollar you earn. It drives decisions like "should I take overtime?" or "should I max out my 401(k)?"

**Effective rate** is what you actually pay as a share of your income. It's always lower than the marginal rate because the progressive bracket structure taxes your earlier dollars at lower rates.

At $75,000 single with standard deduction, you're in the 22% bracket but pay 10.8% overall (federal) or 18.5% (with FICA). The gap is **where tax planning lives** — a dollar moved into a 401(k) saves you 22%, not 10.8%.

## Notes

- **Source**: IRS Rev. Proc. 2024-40; IRS IR-2024-273 (October 22, 2024); SSA 2025 Social Security changes fact sheet.
- **Not included**: state income tax (varies 0–13.3%), AMT, tax credits (child tax credit, EITC), long-term capital gains, qualified dividends, self-employment deductions beyond SE tax. If any of these are a big part of your picture, this number is an undercount or overcount.
- **401(k) reduces taxable income, not FICA** — traditional 401(k) contributions come out of your federal taxable income but still count for Social Security and Medicare. The 2025 elective deferral limit is $23,500.
- This tool is for estimation. For filing, use IRS software or a tax professional.

## Frequently asked questions

### What tax years does this calculator cover?

Tax year 2025, applicable to returns filed in 2026. The brackets and standard deductions come from IRS Rev. Proc. 2024-40 (announced October 2024). IRS adjusts brackets annually for inflation — 2026 brackets typically rise 2-3% from 2025, and the calculator will be updated when the IRS publishes them.

### Does the total include Social Security and Medicare by default?

No — the FICA toggle is off by default. Most people want to see their federal income tax alone first, and add Social Security (6.2%) and Medicare (1.45%) only when they need the full take-home picture. Check the Add Social Security & Medicare box to include them.

### What is the 2025 standard deduction?

$15,000 for single filers and married filing separately; $30,000 for married filing jointly and qualifying surviving spouse; $22,500 for head of household.

### What are the 2025 federal tax brackets for single filers?

10% on income up to $11,925; 12% up to $48,475; 22% up to $103,350; 24% up to $197,300; 32% up to $250,525; 35% up to $626,350; 37% on income above $626,350.

### What changed between 2024 and 2025?

All brackets moved up by roughly 2.8% for inflation, the standard deduction rose ($14,600 → $15,000 single; $29,200 → $30,000 MFJ), and the Social Security wage base rose from $168,600 to $176,100.

### What is the effective tax rate?

Effective rate = total tax (federal, plus FICA and SE if included) divided by gross income. This is a truer cost-of-income measure than the marginal rate, which only applies to the last dollar earned.

### Does this include state income tax?

No — state income tax varies widely and is not included. The calculator covers federal taxes only.

## Sources

- [Federal income tax rates and brackets](https://www.irs.gov/filing/federal-income-tax-rates-and-brackets) — Internal Revenue Service
- [Income tax in the United States](https://en.wikipedia.org/wiki/Income_tax_in_the_United_States) — Wikipedia

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