United States
North America
The United States has the world's largest economy and the most complex tax system. The federal government imposes a progressive income tax, payroll taxes, corporate taxes, capital gains taxes, and estate taxes. State and local governments add their own tax layers. Tax residents are taxed on worldwide income, while non-residents are taxed only on US-source income. The tax year follows the calendar year, with returns due April 15th.
How Taxation Works in United States
Understand the basics of United States's tax system, who pays tax, and how rates apply to individuals and businesses.
Tax System
The US federal income tax uses a progressive rate structure where higher portions of income are taxed at higher rates. Tax is collected through withholding (employer deductions), estimated quarterly payments, and annual filing. The self-assessment system requires taxpayers to calculate and report their own tax liability.
Residents
US citizens, green card holders, and resident aliens are taxed on worldwide income. Non-resident aliens are taxed only on US-source income. Employers withhold federal income tax, Social Security, and Medicare from employee wages. Self-employed individuals pay self-employment tax and make quarterly estimated payments.
Non-Residents
Resident aliens are taxed on worldwide income like US citizens. Non-resident aliens are taxed only on US-source income. Residency is determined by the Substantial Presence Test (183 days or more over a 3-year period) or green card status.
Individuals
The federal income tax uses seven progressive brackets from 10% to 37%. Rates depend on taxable income and filing status. State income tax varies widely — some states have no income tax, while others have top rates above 10%.
Businesses
C-Corporations pay a flat 21% federal corporate tax. Pass-through entities (S-Corps, LLCs, partnerships) are not taxed at the entity level — income flows through to owners' personal returns. Self-employed individuals pay self-employment tax (15.3% for Social Security and Medicare).
Tax Year
The US tax year follows the calendar year (January 1 – December 31). Returns for the calendar year are filed the following April.
Filing Status
Your filing status determines your standard deduction, tax brackets, and eligibility for credits. Options include Single, Married Filing Jointly, Married Filing Separately, Head of Household, and Qualifying Surviving Spouse.
Adjusted Gross Income (AGI)
AGI is your gross income minus above-the-line deductions. It determines eligibility for many tax credits and deductions.
Marginal vs Effective Tax Rate
Your marginal rate is the rate on your last dollar of income. Your effective rate is the average rate across all income.
Current Tax Information
2025 tax slabs, rates, thresholds, and key deductions for United States.
| Rate | Threshold | Notes |
|---|---|---|
| 10% | $0 – $11,600 | Single filers |
| 12% | $11,601 – $47,150 | Single filers |
| 22% | $47,151 – $100,525 | Single filers |
| 24% | $100,526 – $191,950 | Single filers |
| 32% | $191,951 – $243,725 | Single filers |
| 35% | $243,726 – $609,350 | Single filers |
| 37% | Above $609,350 | Single filers; different thresholds for MFJ, HOH, MFS |
Standard Deduction
2025 standard deduction: $15,000 (single), $30,000 (MFJ), $22,500 (HOH), $15,000 (MFS). Additional $2,000 for seniors and blind.
Major Deductions
- Standard Deduction
2025 standard deduction: $15,000 (single), $30,000 (MFJ), $22,500 (HOH), $15,000 (MFS).
- Itemized Deductions
SALT cap of $10,000, mortgage interest on home loans up to $750,000, charitable contributions, medical expenses exceeding 7.5% of AGI.
- Above-the-Line Deductions
Traditional IRA contributions, student loan interest, HSA contributions, educator expenses, self-employment SE deduction.
- Child Tax Credit
Up to $2,000 per qualifying child under 17. Refundable portion up to $1,700 per child.
- Earned Income Tax Credit
Refundable credit for low-to-moderate income workers. Amount varies by income and number of children.
Tax Credits
- Child Tax Credit
Up to $2,000 per qualifying child under 17. Partially refundable.
- Earned Income Tax Credit
Refundable credit for low-to-moderate income workers. Up to $7,430 for 3+ children in 2025.
- American Opportunity Tax Credit
Up to $2,500 per year for the first 4 years of post-secondary education.
- Lifetime Learning Credit
Up to $2,000 per tax return for education expenses.
- Child and Dependent Care Credit
Credit for childcare expenses while working or looking for work.
Important Dates
Key deadlines for United States tax filing, payments, and important milestones.
Federal Tax Filing Deadline
Deadline for individuals to file federal income tax returns (Form 1040) for tax year 2024.
First Quarter Estimated Tax Payment
First quarterly estimated tax payment due for individuals.
Second Quarter Estimated Tax Payment
Second quarterly estimated tax payment due.
Third Quarter Estimated Tax Payment
Third quarterly estimated tax payment due.
Fourth Quarter Estimated Tax Payment
Final quarterly estimated tax payment for tax year 2025.
Federal Tax Extension Deadline
Extended deadline for filing federal returns (Form 4868 must be filed by April 15th).
Government Resources
For the most accurate and up-to-date information, visit the official government tax authority. Below are the most useful official portals, forms, and support resources for United States taxpayers.
Internal Revenue Service (IRS)
Official US federal tax agency — tax forms, publications, filing tools, and payment options.
https://www.irs.gov
IRS Free File
Free tax filing software for eligible taxpayers through IRS partners.
https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
IRS Tax Brackets
Official IRS page with current year tax brackets, standard deductions, and contribution limits.
https://www.irs.gov/newsroom/irs-provides-tax-inflation-adjustments-for-tax-year-2025
Taxpayer Advocate Service
Independent IRS organization helping taxpayers resolve problems.
https://www.taxpayeradvocate.irs.gov
Popular United States Calculators
Estimate your tax liability with our free United States calculators. All calculations run locally in your browser — no data is collected.
Federal Income Tax Calculator
Estimate your United States federal income tax calculator with current rates and rules.
Try calculator →Capital Gains TaxCapital Gains Tax Calculator
Estimate your United States capital gains tax calculator with current rates and rules.
Try calculator →Payroll TaxPayroll Tax Calculator
Estimate your United States payroll tax calculator with current rates and rules.
Try calculator →Income TaxFederal Income Tax Calculator
Open calculator →Payroll TaxPayroll Tax Calculator
Open calculator →Payroll TaxFICA Tax Calculator
Open calculator →Capital Gains TaxCapital Gains Tax Calculator
Open calculator →Capital Gains TaxLong-Term Capital Gains Calculator
Open calculator →Corporate TaxCorporate Tax Calculator
Open calculator →Corporate TaxSmall Business Tax Calculator
Open calculator →Frequently Asked Questions
Quick answers to common questions about United States taxation, filing requirements, and using our calculators.
When is the federal tax filing deadline?
The federal tax filing deadline is typically April 15th. Extensions are available until October 15th by filing Form 4868.
Do I need to file if I live abroad?
US citizens and green card holders must file federal tax returns regardless of where they live abroad. Foreign earned income exclusion may apply.
What is the standard deduction for 2025?
The 2025 standard deduction is $15,000 for single filers, $30,000 for married filing jointly, and $22,500 for heads of household.
What are the 2025 federal tax brackets?
The 2025 federal income tax brackets are 10%, 12%, 22%, 24%, 32%, 35%, and 37% depending on your taxable income and filing status.
What is FICA tax?
FICA (Federal Insurance Contributions Act) tax funds Social Security and Medicare. Employees pay 7.65% (6.2% Social Security + 1.45% Medicare). Employers match the same amount.
Do I need to pay estimated taxes?
If you have income not subject to withholding (self-employment, investments, rental income), you likely need to make quarterly estimated tax payments.
Trust & Transparency
Last Updated
2025-06-15
Educational Disclaimer
The tax information and calculators on this page are for educational and informational purposes only. They do not constitute professional tax advice. Tax laws are subject to change. Always consult a qualified tax professional for advice specific to your situation.
Calculation Methodology
Tax calculations follow the Internal Revenue Code and IRS regulations. Brackets and rates are sourced from the latest IRS Revenue Procedure. The standard deduction amounts are adjusted annually for inflation per the Tax Cuts and Jobs Act. Capital gains rates follow the preferential long-term rates established by the American Taxpayer Relief Act of 2012.
Data Sources
- Internal Revenue Service (IRS)
- Tax Cuts and Jobs Act (TCJA)
- SECURE 2.0 Act
Privacy-First
All calculations are performed locally in your browser. No personal data is collected, stored, or transmitted to any server. Your financial information never leaves your device.
Explore United States Tax
Tax Categories
Income Tax
Federal and state income tax obligations for individuals and businesses in the United States.
Payroll Tax
Employer and employee payroll tax obligations including FICA and self-employment taxes.
Corporate Tax
Federal corporate income tax and business entity taxes.
Capital Gains Tax
Tax on profits from the sale of investments and property.
Estate & Inheritance Tax
Federal estate tax and state inheritance taxes.