What Is Form 1040?
In plain English
Form 1040 (U.S. Individual Income Tax Return) is the primary federal tax form used by individuals to report all sources of income, claim deductions and credits, calculate tax owed or refund due, and file their annual return with the IRS. Nearly every U.S. taxpayer uses some version of Form 1040.
What Information Does Form 1040 Require?
Form 1040 collects your filing status, income from all sources (wages, investments, self-employment, retirement distributions), adjustments to income, the standard deduction or itemized deductions, tax credits, and payments/withholding. Supporting schedules (Schedule 1-3, Schedule C, Schedule D, etc.) provide detail for specific income types and deductions.
When Is Form 1040 Due?
Form 1040 is due April 15 each year (or the next business day if April 15 falls on a weekend or holiday). Filing an extension (Form 4868) gives you until October 15 but does not extend the payment deadline. You must estimate and pay any tax owed by April 15 to avoid penalties and interest.
How Do You File Form 1040?
You can file electronically (e-file) using tax software, through a tax professional, or via IRS Free File if your income qualifies. Paper filing by mail is still an option but results in slower processing and refunds. The IRS strongly encourages e-filing with direct deposit for the fastest refund turnaround.
Frequently asked questions
Do I need to file a Form 1040 if my income is below the threshold?
If your gross income is below the filing threshold for your age and filing status, you may not be required to file. However, filing is still worthwhile if you had federal taxes withheld (to get a refund) or qualify for refundable credits like the EITC.
What is the difference between Form 1040 and 1040-SR?
Form 1040-SR is a simplified version designed for taxpayers age 65 and older. It has larger print and a built-in standard deduction chart but collects the same information as the regular 1040. Either form can be used by qualifying seniors.
Keep exploring
Related terms
Standard Deduction
The standard deduction is a fixed dollar amount that reduces your taxable income without requiring you to list individual expenses. Most Americans claim it instead of itemizing.
Itemized Deductions
Itemized deductions let you list specific qualifying expenses to reduce taxable income instead of taking the standard deduction. They benefit taxpayers with large mortgage interest, medical bills, or charitable contributions.
Tax Filing Status
Your tax filing status determines your tax bracket thresholds, standard deduction amount, and eligibility for various credits and deductions. Choosing the correct status is one of the most impactful decisions in tax planning.
Adjusted Gross Income (AGI)
Adjusted gross income is your total income minus specific above-the-line deductions. It is the key figure on your tax return that determines eligibility for many credits, deductions, and financial programs.
Tax Professional
A tax professional is a qualified expert — CPA, enrolled agent, or tax attorney — who helps individuals and businesses with tax preparation, planning, and compliance.