An income tax return is a form you file with the IRS that reports how much money you earned and how much tax you owe

An income tax return is a document — usually Form 1040 or a variation of it — that you send to the Internal Revenue Service (IRS) each year. It tells the IRS three things: how much income you received, what deductions or credits you can claim, and whether you paid enough tax throughout the year or owe more.

You file a return because the IRS requires it if your income exceeds a certain threshold. That threshold depends on your age, filing status, and type of income. For example, a single person under 65 with only wages typically must file if they earned more than $13,850 in 2023, but a self-employed person must file if they had net earnings of $400 or more, regardless of total income.

The return itself is not a bill or a payment. It is a record. After you file, the IRS compares what you reported to what your employer or bank already told them you earned. If you paid too much in taxes during the year (through paycheck withholding), you get a refund. If you paid too little, you owe the difference.

Key Takeaways

  • An income tax return reports your income, deductions, and credits to the IRS and determines whether you owe additional tax or will receive a refund.
  • You must file a return if your income exceeds thresholds set by the IRS, which vary based on age, filing status, and whether you are self-employed.
  • The most common form is Form 1040, though self-employed people, farmers, and others may use different forms depending on their situation.
  • Filing a return is required even if you do not owe tax, because it is how you claim refundable credits like the Earned Income Tax Credit (EITC).

The main parts of a tax return

A tax return has sections that build on each other. You start by reporting all income — wages from a job, interest from a bank account, self-employment income, rental income, or other sources. Each type of income goes on a different line or schedule.

Next, you report deductions. A deduction reduces the income the IRS counts as taxable. You can either take the standard deduction (a flat amount set by the IRS each year) or itemize deductions (add up specific expenses like mortgage interest or charitable donations). Most people take the standard deduction because it is simpler and often larger.

Then you claim credits, which are different from deductions. A credit directly reduces the tax you owe, dollar for dollar. For example, if you owe $2,000 in tax and you have a $1,500 credit, your tax drops to $500. Common credits include the Child Tax Credit, the Earned Income Tax Credit, and education credits.

Finally, the return shows how much tax you owe based on your income minus deductions, minus credits. It also shows how much you already paid through paycheck withholding or estimated tax payments. The difference is either your refund or the amount due.

Who must file and when

The IRS requires you to file if your income is above a threshold. For 2023, a single person under 65 with only W-2 wages must file if they earned more than $13,850. A married couple filing jointly with only wages must file if they earned more than $27,700 combined. These numbers change each year.

Self-employed people have a lower threshold. If you had net self-employment income of $400 or more in a year, you must file, even if your total income is low. This is because self-employment tax (Social Security and Medicare tax) is owed on that income.

You must also file if you had income tax withheld from your paychecks and want to claim a refund, even if you are below the income threshold. The same applies if you want to claim the Earned Income Tax Credit or other refundable credits — you have to file to receive them.

Tax returns are due on April 15 in most years, though the IRS sometimes extends this date. If you cannot file by then, you can request an extension, but this only delays filing — it does not delay payment if you owe tax.

Different forms for different situations

Form 1040 is the main individual income tax return, but the IRS provides variations and schedules depending on what kind of income you have. If you are self-employed, you also file Schedule C to report business income and expenses. If you have rental income, you file Schedule E. If you have capital gains or losses, you file Schedule D.

Farmers file Schedule F. People with significant investment income may file Schedule B. If you itemize deductions instead of taking the standard deduction, you file Schedule A. These schedules attach to your Form 1040 and provide the detail the IRS needs to verify your return.

Some people use a simplified form called Form 1040-SR if they are 65 or older and have straightforward tax situations. Others use Form 1040-NR if they are a nonresident alien. The form you use depends on your age, citizenship status, income sources, and whether you itemize.

How filing affects your refund or tax owed

Throughout the year, if you have a job, your employer withholds tax from your paycheck based on a form called the W-4. This withholding is an estimate. It is not exact. When you file your return, you are settling the actual amount of tax you owe based on your real income, deductions, and credits.

If your employer withheld more than you actually owe, the IRS sends you a refund. If your employer withheld less, you owe the difference by the filing important date. Self-employed people do not have withholding, so they often owe tax when they file unless they made estimated tax payments during the year.

The return is also where you claim credits that can result in a refund even if you owe no tax. The Earned Income Tax Credit and the Additional Child Tax Credit are refundable, meaning you can receive money back even if your tax liability is zero. This is why many low-income households file returns even though they have no tax obligation.

What happens after you file

After you file your return, the IRS processes it. This can take several weeks. If you filed electronically and chose direct deposit for your refund, you typically receive it within 21 days. If you filed on paper, it takes longer.

The IRS compares your return to information it received from your employer (W-2 forms), banks (1099 forms for interest), and other sources. If everything matches, your return is accepted and you are done. If there is a discrepancy, the IRS may contact you to clarify.

If you owe tax and do not pay by the important date, the IRS charges interest and penalties. If you cannot pay in full, you can set up a payment plan. The IRS also offers an Offer in Compromise program in limited situations where you cannot pay what you owe.

Keeping records and supporting documents

You do not send receipts or supporting documents with your return. However, you must keep them for at least three years in case the IRS asks to see them. This includes W-2s, 1099s, receipts for deductions, charitable donation records, and medical expense documentation.

If you are self-employed, keep records of income and business expenses — invoices, receipts, mileage logs, and bank statements. If you itemize deductions, keep proof of mortgage interest payments, property tax payments, and charitable donations. The IRS can request these records at any time during the statute of limitations period.

Frequently Asked Questions

Do I have to file a tax return if I did not earn much money?

It depends on how much you earned and your filing status. If your income is below the IRS threshold for your situation, you are not required to file. However, you should file anyway if you had taxes withheld from your paychecks, because you may receive a refund. You should also file if you want to claim the Earned Income Tax Credit or other refundable credits.

What is the difference between a refund and a credit?

A refund is money the IRS sends you because you paid more tax than you owed. A credit is a reduction in the tax you owe. Some credits are refundable, meaning if the credit is larger than your tax liability, the IRS sends you the difference as a refund. Other credits are nonrefundable and can only reduce your tax to zero.

Can I file my tax return before I receive my W-2?

No. Your employer must send you a W-2 by January 31, and you need it to file accurately. If you have not received your W-2 by early February, contact your employer. If they do not provide it, you can contact the IRS. You can file your return as soon as you have all the documents you need.

What happens if I make a mistake on my return?

If you discover an error after filing, you can file an amended return using Form 1040-X. You have three years from the original due date to file an amended return and claim a refund. If the IRS finds an error, they will contact you and either send you a corrected bill or refund.

Do I need to file if I am self-employed and earned less than $400?

No. Self-employed people must file only if their net self-employment income is $400 or more. However, if you had other income or taxes withheld, you may still want to file to claim a refund or credits.