The federal income tax is the largest source of revenue for the U.S.

government, accounting for over 50% of total federal receipts.

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The standard deduction, which reduces a taxpayer's taxable income, was increased substantially in 2017 under the Tax Cuts and Jobs Act, from $6,350 for single filers to $12,200.

The Earned Income Tax Credit (EITC) is a refundable tax credit that can result in a tax refund for low-to-moderate income working individuals and families, even if they have no income tax liability.

The top marginal tax rate in the U.S.

is currently 37%, applied to taxable income over $539,900 for single filers and $647,850 for married couples filing jointly.

The IRS allows taxpayers to deduct student loan interest of up to $2,500 per year, phased out for higher-income individuals.

Taxpayers can claim a child tax credit of up to $2,000 per qualifying child under the age of 17, with a portion of the credit being refundable.

The alternative minimum tax (AMT) was originally intended to ensure that high-income individuals paid a minimum amount of tax, but it has increasingly affected middle-class taxpayers over time.

The IRS requires taxpayers to report income from all sources, including wages, tips, self-employment, interest, dividends, capital gains, and certain government benefits.

The tax filing status of "head of household" allows for a higher standard deduction and more favorable tax rates compared to single filers, but has specific requirements related to dependents and living arrangements.

Contributions to qualified retirement accounts, such as 401(k)s and traditional IRAs, can lower a taxpayer's taxable income through the use of pre-tax or tax-deferred contributions.

The Foreign Earned Income Exclusion allows U.S.

citizens living abroad to exclude up to $112,000 (in 2022) of their foreign-earned income from U.S.

federal income taxes.

The Affordable Care Act introduced the individual mandate, which required most Americans to have a minimum level of health insurance coverage or face a tax penalty, though this penalty was reduced to $0 starting in 2019.

The Tax Cuts and Jobs Act limited the state and local tax (SALT) deduction to $10,000 per year, which has significantly impacted taxpayers in high-tax states.

Taxpayers can claim a credit for up to 30% of the cost of qualified residential energy-efficient property, such as solar panels, geothermal heat pumps, and wind turbines.

The IRS requires taxpayers to report the sale of virtual currencies, such as Bitcoin, and treat any gains as capital gains subject to federal income tax.

The Taxpayer Advocate Service is an independent organization within the IRS that helps taxpayers resolve issues with the IRS and advocate for their rights.

The IRS offers various payment options and plans for taxpayers who are unable to pay their tax bill in full, including installment agreements and offers in compromise.

The IRS can impose penalties for late filing, late payment, and underpayment of taxes, which can significantly increase the amount owed.

Taxpayers can claim a deduction for charitable contributions made to qualifying organizations, subject to certain limitations based on their income and filing status.

The IRS provides free tax preparation services through the Volunteer Income Tax Assistance (VITA) and Tax Counseling for the Elderly (TCE) programs for eligible taxpayers.