Income Tax: Features of Taxation in the USA

Income tax is a key element of the US tax system. Individuals and organizations pay it. The procedure depends on many factors.

The main feature is multi-level taxation. Tax is levied at the federal level. It also applies at the state level. In some cases, local tax is added. Official IRS information contains full rules.

Federal Income Tax for Individuals

Individuals pay Federal Income Tax. The tax applies to taxable income.

Taxable income includes:

• Salary and business income.
• Freelancer and self-employment income.
• Interest, dividends, and royalties.
• Rental income and capital gains.
• Digital platform income.
• Foreign income.
• Certain compensation payments.

The US uses a progressive scale. A higher rate applies only to part of income. It does not apply to the entire amount.

Seven rates apply for 2026. They are 10%, 12%, 22%, 24%, 32%, 35%, and 37%.

Individual Tax Status

Tax status is important for calculation. It determines the scope of obligations.

A person may have the following status:

• US citizen.
• Green Card holder.
• US tax resident.
• Non-resident.
• Foreign person with US-source income.

Citizens and residents declare worldwide income. This applies regardless of the country of receipt. Non-residents pay tax only on US sources.

Filing Obligation

The obligation depends not only on income amount. A complex of factors is considered.

The following are considered when determining the obligation:

• Tax status and age.
• Marital status.
• Income sources.
• Presence of business activity.
• Right to tax benefits.

The return is filed for final tax calculation. It is also needed for refund receipt. Tax credit application requires filing.

Filing Status

Tax amount depends on Filing Status. This is the return filing status.

Main options include:

• Single — one taxpayer.
• Married Filing Jointly — joint spousal return.
• Married Filing Separately — separate filing.
• Head of Household — household head.
• Qualifying Surviving Spouse — surviving spouse.

The chosen status affects the standard deduction. It also determines rates and credit eligibility. Joint filing is usually more beneficial. However, foreign income requires analysis.

Standard Deduction and Itemized Deductions

The taxpayer reduces income by deductions. This happens before tax calculation.

Standard Deduction is most common. For 2026, it amounts to:

• $16,100 — Single.
• $16,100 — Married Filing Separately.
• $32,200 — Married Filing Jointly.
• $24,150 — Head of Household.

If expenses exceed the standard deduction, Itemized Deductions are used.

Itemized deductions include:

• Certain medical expenses.
• Mortgage interest.
• Charitable donations.
• State and local taxes.
• Other allowed expenses.

The most beneficial option is chosen. This legally reduces the burden.

Tax Credits

Tax Credits reduce the calculated tax amount. This distinguishes them from deductions.

The most common include:

• Child Tax Credit.
• Earned Income Tax Credit.
• Education credits.
• Adoption Credit.
• Energy credits.
• Foreign Tax Credit.

Credits significantly affect the final tax. Their use requires knowledge of conditions.

Foreign Income

The US system taxes worldwide income of residents. This is a key feature.

Income outside the US is included in the return. This applies to citizens and Green Card holders. Tax residents also follow this rule.

To prevent double taxation, the following apply:

• Foreign Tax Credit — foreign tax offset.
• Foreign Earned Income Exclusion — partial income exclusion.

Foreign accounts trigger FBAR reporting. FATCA requirements also apply.

Net Investment Income Tax

NIIT applies to high-income taxpayers. The rate is 3.8%.

The tax applies to investment income:

• Interest and dividends.
• Capital gains.
• Certain rental income.
• Passive income.
• Some investment receipts.

This tax adds to the main obligation. It must be considered in planning.

Alternative Minimum Tax

AMT is an alternative minimum tax. It applies to certain taxpayers.

AMT affects high-income individuals. It also concerns significant deductions. The goal is to prevent excessive burden reduction. The system limits benefit usage.

Income Tax for Self-Employed

Self-employed report profit on personal returns. This applies to Sole Proprietorship and Single-Member LLC.

Profit may be subject to the following taxes:

• Federal income tax.
• State tax.
• Self-Employment Tax.

Self-Employment Tax includes Social Security and Medicare contributions. Most self-employed pay Estimated Tax Payments. These are advance tax payments.

Income Tax and Business Forms

Tax consequences depend on business form. Structure choice is critical.

Sole Proprietorship and Single-Member LLC

Profit is taxed at the owner level. It is reported on the personal return. Single-Member LLC is a Disregarded Entity. Income is included in the personal return.

Partnership

Partnership does not pay federal tax. The company files an informational return. Profit is distributed via Schedule K-1. Each partner pays tax independently.

S Corporation

S Corporation uses pass-through taxation. The company does not pay federal profit tax. Income is reported on shareholder returns.

Owners must receive Reasonable Salary. It is subject to Payroll Taxes. This is a mandatory requirement.

C Corporation

C Corporation is an independent taxpayer. The corporate tax rate is 21%. Shareholders pay additional tax on dividends.

This mechanism is called Double Taxation. Form choice requires considering growth plans.

State and Local Taxes

Many states establish State Income Tax. It adds to federal tax.

Some states do not levy income tax. These include Florida, Texas, and Nevada. Also Washington, Wyoming, South Dakota, and Alaska.

Other states have high rates. Some cities impose local taxes. This creates additional burden.

Tax Withholding at Source

Tax is often withheld upon income payment. This is standard practice.

For employees, the employer withholds:

• Federal income tax.
• Social Security.
• Medicare.
• State tax (if applicable).

Withholding Tax applies to foreign persons. The rate may be reduced by treaty. Proper tax form completion is required.

Estimated Tax Payments

Tax is not always withheld automatically. In this case, advance payments are made.

The obligation arises for the following categories:

• Entrepreneurs and self-employed.
• Business owners.
• Investors and landlords.
• Freelancers.
• Persons with platform income.

The amount is calculated by estimated tax. Previous year obligation is also used. Late payment leads to penalties.

Income That May Not Be Taxed

Some income is exempt from tax. Exemption depends on conditions.

Potentially non-taxable income includes:

• Certain gifts and inheritance.
• Some insurance payments.
• Municipal bond interest.
• Some social benefits.
• Return of own funds.

Such income sometimes must be reported. Even if no tax arises.

Taxpayer Mistakes

Typical mistakes occur in practice. They lead to penalties and assessments.

Most common mistakes include:

• Incorrect residency determination.
• Failure to file when required.
• Wrong Filing Status selection.
• Ignoring foreign income.
• Incorrect deduction application.
• Not using tax credits.
• Late Estimated Tax Payments.
• Wrong business structure choice.
• Not considering NIIT on investment income.
• Missing foreign account reporting.

Proper planning helps avoid these problems. Specialist consultation reduces risks.

Conclusion

US income tax is a complex system. Not only income amount matters, but also status. Business form and income source are also important. For individuals, determining residency is crucial. Filing Status selection is also necessary. Timely declaration of all income is mandatory.

For business, form choice is key. Taxation level depends on it. Proper planning legally reduces the burden.