Calculate US Federal and State Income Tax
Use this premium tax calculator to estimate your federal income tax, state income tax, taxable income, and take-home income based on your filing status, income, deductions, and credits. This tool uses 2024 federal brackets and a practical state tax model for several common tax jurisdictions.
Your Tax Estimate
Enter your information and click Calculate Tax to see your estimated federal and state income tax breakdown.
Expert Guide: How to Calculate US Federal and State Income Tax
Learning how to calculate US federal and state income tax is one of the most useful financial skills for employees, freelancers, business owners, and retirees. It helps you understand your paycheck, estimate quarterly payments, compare job offers in different states, and avoid unpleasant tax surprises at filing time. Even a basic understanding of how tax brackets, deductions, and credits work can improve your budgeting and long-term planning.
At a high level, income tax in the United States usually has two main layers. First, the federal government taxes taxable income using progressive tax brackets. Second, many states impose their own income tax using either a progressive system, a flat rate, or no wage income tax at all. In some places, cities or counties can also add a local income tax. That means your total income tax bill may include federal, state, and local components.
Key concept: your marginal tax rate is not the same as your effective tax rate. A marginal rate applies only to the top portion of your taxable income within a bracket, while your effective tax rate is the average percentage of your income paid in tax overall.
Step 1: Start with gross income
Gross income is the starting point for most tax calculations. For many taxpayers, this includes wages, salaries, bonuses, tips, commissions, freelance income, and certain investment or retirement distributions. If you want a simple estimate for earned income tax, begin with your total annual wages or your expected annual business profit.
For example, if you earn $85,000 in salary and contribute $5,000 to a traditional 401(k), your gross income is still $85,000, but your tax calculation will often be based on a lower adjusted amount after permitted pre-tax deductions.
Step 2: Subtract pre-tax deductions and above-the-line adjustments
Many taxpayers reduce taxable income through pre-tax payroll deductions or adjustments to income. Common examples include:
- Traditional 401(k), 403(b), or 457 plan contributions
- Health Savings Account contributions
- Traditional IRA contributions, when deductible
- Self-employed health insurance deductions
- Student loan interest deduction, when eligible
- Certain educator expenses or self-employment adjustments
Once these amounts are subtracted, you move closer to adjusted gross income, often called AGI. AGI matters because several deductions, credits, and phaseouts are based on it.
Step 3: Choose standard deduction or itemized deductions
Most taxpayers use the standard deduction because it is simpler and often larger than total itemized deductions. However, if your deductible expenses exceed the standard deduction, itemizing may reduce your taxable income more. Common itemized categories include mortgage interest, charitable donations, and a limited amount of state and local taxes.
For tax year 2024, widely used federal standard deductions are:
| Filing Status | 2024 Standard Deduction | Practical Impact |
|---|---|---|
| Single | $14,600 | Reduces taxable income before applying federal brackets. |
| Married Filing Jointly | $29,200 | Often creates a lower combined federal taxable income for married couples filing together. |
| Married Filing Separately | $14,600 | Same basic deduction as single for many taxpayers, but other rules may differ. |
| Head of Household | $21,900 | Can significantly reduce taxable income for eligible unmarried taxpayers supporting dependents. |
Suppose a single taxpayer has $80,000 of income after pre-tax deductions and claims the 2024 standard deduction of $14,600. That leaves $65,400 in federal taxable income. The entire $65,400 is not taxed at one rate. Instead, different slices fall into different brackets.
Step 4: Apply federal income tax brackets
The federal income tax system is progressive. That means the first part of taxable income is taxed at a lower rate, and only the income above each threshold is taxed at the next rate. This is why people often misunderstand what it means to “move into a higher bracket.” Crossing into a higher bracket does not cause all your income to be taxed at that higher rate.
For 2024, the federal rates remain 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with bracket thresholds depending on filing status. The calculator on this page estimates federal tax by applying each bracket sequentially to your taxable income. This gives a much better estimate than multiplying income by just one rate.
- Determine taxable income after adjustments and deductions.
- Apply the first bracket rate to the first portion of income.
- Apply the next bracket rate only to income above the first threshold.
- Continue until all taxable income is taxed.
- Subtract eligible federal tax credits.
Credits are especially powerful because they reduce tax directly, dollar for dollar. A $2,000 tax credit generally saves more than a $2,000 deduction because a deduction only lowers the income subject to tax.
Step 5: Calculate state income tax
State tax rules vary widely. Some states, such as Texas and Florida, do not impose a broad state income tax on wage income. Others use flat systems, while many use progressive brackets similar to the federal government. Some states also have their own deductions, exemptions, credits, or local taxes.
Because every state has unique rules, the most accurate tax return calculation should always be completed using the forms and instructions for your state. Still, an estimate is extremely useful for planning. This page includes a practical state model for California, New York, New Jersey, Illinois, Pennsylvania, Texas, Florida, and Washington.
| State | General System | Representative Rate Information | Planning Takeaway |
|---|---|---|---|
| California | Progressive | Top marginal rate reaches 13.3% on high incomes | High earners often feel a significant state tax impact. |
| New York | Progressive | Top state rate exceeds 10% at high income levels | Combined state and local taxes can materially raise total tax burden. |
| New Jersey | Progressive | Rates rise by income level and can become substantial for upper brackets | Tax planning matters more as income increases. |
| Illinois | Flat | 4.95% individual income tax rate | Simple estimate compared with multi-bracket states. |
| Pennsylvania | Flat | 3.07% personal income tax rate | Moderate statewide rate, though local taxes may still apply. |
| Texas | No broad wage income tax | 0% state income tax on wage income | Federal tax dominates income tax calculation. |
| Florida | No broad wage income tax | 0% state income tax on wage income | Popular for take-home pay comparisons. |
| Washington | No broad wage income tax | 0% state income tax on wage income | Useful benchmark when comparing state tax exposure. |
Why federal and state estimates differ so much
Two households with the same salary can owe very different tax amounts. The main reasons include filing status, retirement contributions, itemized deductions, family tax credits, and state of residence. A married couple filing jointly often receives a larger standard deduction than a single filer. A taxpayer who contributes aggressively to tax-deferred retirement accounts may reduce taxable income substantially. Meanwhile, a person living in California or New York may owe thousands more in state income tax than a person earning the same amount in Texas or Florida.
What this calculator includes and what it does not
This calculator is designed to estimate federal and state income tax. It focuses on income taxes, not total payroll taxes. In other words, it does not add Social Security and Medicare taxes, self-employment tax, capital gains tax rules, Net Investment Income Tax, or all possible state-specific credits and deductions. If you need a paycheck estimate, you would usually want payroll taxes included too. If you need a filing-ready number, you should review the current federal and state instructions or consult a qualified tax professional.
- Included: federal taxable income estimate, standard or itemized deduction comparison, federal bracket calculation, selected state tax estimate, optional local tax rate, and federal tax credits.
- Not included: FICA payroll taxes, self-employment tax, AMT, QBI deduction, detailed state credits, and all local jurisdiction rules.
Common mistakes people make when trying to calculate income tax
- Using gross income instead of taxable income. Deductions and adjustments matter.
- Assuming all income is taxed at one bracket. Federal taxation is progressive.
- Ignoring state tax. State differences can materially affect take-home pay.
- Forgetting credits. Credits can significantly reduce final federal liability.
- Confusing withholding with actual tax. Withholding is what you prepay, not necessarily what you owe.
How to use this estimate for smarter planning
Once you know your estimated federal and state tax, you can make better year-round decisions. For example, if your effective tax rate looks higher than expected, you might increase pre-tax retirement savings, adjust withholding, or set aside more for estimated payments. If you are deciding between job offers in different states, comparing after-tax income is often more meaningful than comparing salary alone.
You can also use tax estimates to answer questions like these:
- How much of a raise will I actually keep after taxes?
- Will contributing more to my 401(k) lower my federal tax bill meaningfully?
- What happens to my take-home pay if I relocate to a no-income-tax state?
- Should I plan for quarterly estimated tax payments?
- Will itemizing deductions beat the standard deduction this year?
Authoritative resources for federal and state tax research
If you want to validate assumptions or review official rules, start with government and university-backed resources. The following sources are especially useful:
- IRS.gov for official federal forms, tax brackets, deductions, credits, and publication guidance.
- Federation of Tax Administrators state tax agency directory for direct links to state revenue departments.
- Cornell Law School Legal Information Institute for educational legal explanations of tax concepts.
Final takeaway
To calculate US federal and state income tax accurately, begin with gross income, subtract pre-tax deductions and eligible adjustments, apply the larger of the standard or itemized deduction for federal purposes, compute federal tax using progressive brackets, subtract federal credits, then add any state and local income tax. That process gives you a realistic estimate of your annual income tax liability and your likely after-tax income.
This page provides an educational estimate based on current general rules and simplified state modeling. Tax laws change, and personal circumstances can affect eligibility for deductions, credits, and filing treatment.