How to fill out Form 1040: A step-by-step guide

The following suggestions are for informational purposes only. For official IRS instructions on how to fill out a 1040 form, go to https://www.irs.gov/forms-pubs/about-form-1040.

Every year, millions of Americans rely on IRS Form 1040 to report their taxable income, claim relevant tax deductions and credits, and finalize their federal tax obligations. If you’re wondering how to fill out 1040 forms accurately, you’ve come to the right place. This essential document serves as the foundation of filing taxes in the United States, and whether you’re a first-time filer or an experienced taxpayer, understanding the ins and outs of Form 1040 is crucial.

In this guide, we’ll walk you through the process of completing IRS Form 1040 step by step. You’ll learn about documents you need, how to enter different types of income, and how to ensure you don’t miss out on any valuable deductions or credits. Let’s get started!

What is IRS Form 1040?

IRS Form 1040 is the primary tax form that individuals use to file their federal income tax returns in the United States. Its main purpose is to capture the filer’s income and calculate the appropriate tax liability based on that income. Whether you earn wages from an employer, operate as self-employed, or have investment income, this form covers it all. Form 1040 helps the IRS determine if you owe additional taxes or are entitled to a refund.

The form is divided into sections that collect personal information, details about income, income adjustments, deductions, and tax credits. Depending on your financial situation, some sections may not apply to you.

Who needs to fill out a Form 1040?

If you earned income in the United States this year, you likely need to file a Form 1040 to report that income to the IRS. Generally, taxpayers who made more than the minimum filing threshold — which varies by filing status — must complete and submit this document.

For 2024, single filers under age 65 with a gross income of at least $14,600 must file. Married couples filing jointly generally need to file if their joint income surpasses $29,200, while heads of household must file if they earn at least $21,900.

Self-employed individuals must file a return if their net earnings exceed $400, regardless of age. Even if your earnings fall below these thresholds, you might still want to file if you had taxes withheld and could receive a refund or if you qualify for certain tax credits (like the Child Tax Credit or Education Credits).

In some cases, individuals who participate in specific programs such as health savings accounts or have unique deductions also must file Form 1040.

Some documents you’ll need before starting

Having the right paperwork in front of you can save time and help you avoid mistakes. To fill out your IRS Form 1040 correctly, gather:

  • W-2 forms from each employer you worked for during the tax year, detailing wages and withholdings.
  • 1099 forms for self-employment income, freelance projects, or investment earnings such as dividends and interest.
  • Receipts and records for deductible expenses — like charitable contributions, medical costs, and other itemized deductions — and any evidence of tax credits.
  • A copy of last year’s tax return for reference.

These documents make it much easier to accurately report your taxable income, determine eligibility for certain tax deductions, and finalize your filing.

Step-by-step instructions to complete Form 1040

Personal information

Enter your details, including your name, address, and Social Security number. Be sure to indicate your filing status: single, married filing jointly, married filing separately, or head of household. This status can affect your standard deduction and potential tax credits.

Income section

Next, report all sources of income on the form. Start with wages, salaries, and tips from your W-2 forms. If you’re self-employed, report your income using Schedule C (Profit or Loss from Business – Sole Proprietorship). This form is used to calculate net profit or loss from your business activities after deducting allowable business expenses.

  • The net profit or loss from Schedule C is then transferred to Schedule 1, Part 1 (Additional Income Section).
  • Finally, this amount flows into Form 1040, Page 1, which is included in your total income.

Adjustments to income

Some deductions, known as “above-the-line” deductions, can reduce your taxable income before calculating Adjusted Gross Income (AGI). These deductions are reported on Schedule 1, Part II (Adjustments to Income) and may include:

  • Student loan interest
  • Traditional IRA contributions
  • Self-employed health insurance premiums

After being recorded on Schedule 1, Part II, these deductions are transferred to Form 1040, Page 1, where they help determine your Adjusted Gross Income (AGI).

Deductions

After calculating your AGI, you’ll need to decide between taking the standard deduction or itemizing your deductions. The standard deduction is a flat amount set by the IRS, while itemizing allows you to list specific deductible expenses. Choose whichever option lowers your taxable income the most.

Tax credits and payments

Next, enter any eligible tax credits, such as the Child Tax Credit, Earned Income Tax Credit, or education-related credits. These credits directly reduce your tax liability, so they can be quite valuable. Also, include any federal income tax withheld from your paychecks throughout the year or any estimated tax payments you made.

Calculating refund or amount owed

Finally, subtract your total credits and withholdings from your total tax liability. If the result is a negative number, you’ll receive a refund. If it’s positive, you owe taxes. The form offers information on how to pay any balance due. You can mail a check, pay online through the IRS website, or use other payment options like a direct debit from your bank account.

Double-check all numbers before signing and dating your return.

Review your entries

Once you’ve filled in every section, take a moment to review your entries carefully. Simple errors like typos, incorrect Social Security numbers, or mismatched totals can delay your return or even trigger an audit.

Verify your calculations, confirm your filing status, and ensure every piece of income is accurately reported before you send your Form 1040 to the IRS.

1040 generator by Jotform

Jotform’s 1040 tax form generator simplifies the filing process by allowing you to fill out 1040 forms directly from any device, whether a computer, tablet, or smartphone.

Once completed, you can instantly download Form 1040 as a PDF, preserving the layout and making record-keeping hassle-free.

Data security is a top priority for Jotform, which offers 256-bit SSL encryption, GDPR and CCPA compliance features, and optional HIPAA compliance features for healthcare professionals. You can also encrypt your forms or add a CAPTCHA field to protect against spam.

Filling out IRS Form 1040 doesn’t have to be intimidating. You can file an accurate return and maximize your refund by gathering the necessary documents, understanding your filing status, and carefully reporting your income, deductions, and tax credits.

Consulting a tax professional is always a good idea for more complex situations or if you are uncertain about specific tax form instructions.

Remember, Jotform’s online 1040 tax form generator offers a convenient way to complete your forms securely.

AS ALWAYS, CONSULT AN ATTORNEY BEFORE RELYING ON ANY INFORMATION ON THIS PAGE. THE CONTENT ABOVE IS FOR INFORMATIONAL PURPOSES ONLY.

Photo by Nataliya Vaitkevich

AUTHOR
Jotform's Editorial Team is a group of dedicated professionals committed to providing valuable insights and practical tips to Jotform blog readers. Our team's expertise spans a wide range of topics, from industry-specific subjects like managing summer camps and educational institutions to essential skills in surveys, data collection methods, and document management. We also provide curated recommendations on the best software tools and resources to help streamline your workflow.

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