What is Form 1040?
Form 1040 is the main return almost every U.S. taxpayer files each year. It's where you report all your income, claim the standard or itemized deduction, apply credits, and figure whether you owe or get a refund.
Think of the 1040 as the summary sheet that pulls everything together. Income flows in from your W-2s and 1099s, adjustments and deductions come off, credits knock down the tax, and your payments (withholding plus any estimates) settle the score. Most of the complexity actually lives in the attached schedules — Schedule 1 for extra income and adjustments, Schedule 2 for other taxes, Schedule 3 for additional credits — while the 1040 itself stays surprisingly short.
Who files it
Individuals and married couples with income above the filing threshold. Seniors can use the nearly identical Form 1040-SR with larger type.
When it's due
Form 1040 is generally due April 15. Deadlines can move for weekends and holidays, so confirm the exact date for the current year on IRS.gov.
Key lines and parts
Here's what you'll actually fill in on Form 1040:
- Filing status and dependents (top of form)
- Wages, interest, dividends and other income (lines 1–9)
- Adjustments and AGI (lines 10–11)
- Standard/itemized deduction and taxable income (lines 12–15)
- Tax, credits, payments and refund or amount owed (lines 16–37)
How to file
File electronically for the fastest refund, or mail a paper return. Most people attach schedules (like Schedule 1, 2 or 3) for extra income, adjustments or credits.