Filing taxes is submitting a record of your income and deductions to the government so they can calculate what you owe or what they owe you

When you file taxes, you are telling the Internal Revenue Service (IRS) how much money you earned in the past year, what expenses or deductions you can subtract from that income, and therefore how much tax you actually owe. The IRS uses this information to determine whether you paid enough tax throughout the year (usually through paycheck withholding or quarterly payments) or whether you overpaid and deserve a refund.

Filing is not optional if your income crosses certain thresholds. The IRS requires most people who earned above a minimum amount to file a return each year. Even if you earned below that threshold, filing can still benefit you — for instance, if taxes were withheld from your paychecks, you may get money back.

Key Takeaways

  • Filing taxes means submitting a form (usually Form 1040 or a variant) to the IRS that reports your income, deductions, and tax payments for the year.
  • You are required to file if your income exceeds thresholds set by the IRS, which vary based on your age, filing status, and type of income.
  • Filing determines whether you owe additional tax, receive a refund, or have paid the correct amount.
  • You can file on paper by mail or electronically through tax software, a tax preparer, or the IRS Free File program if you meet income limits.
  • The deadline to file is usually April 15 of the year following the tax year, though you can request an extension.

Why the government requires you to file

The federal government funds itself partly through income tax. When you work, your employer withholds a portion of each paycheck and sends it to the IRS on your behalf. Filing a tax return is how you reconcile what was actually withheld against what you actually owe based on your full income picture for the year.

If you withheld too much, you get a refund. If you withheld too little, you owe the difference. If you are self-employed or have income sources that do not withhold tax automatically, filing is how you pay what you owe. Filing also allows you to claim deductions and tax credits that can reduce your tax burden — the government wants an accurate record so it can collect the right amount, not more or less.

What documents you need to gather before filing

Before you file, collect documents that show your income and any deductions or credits you plan to claim. If you are employed, your employer will send you a W-2 form by January 31 showing your wages and taxes withheld. If you are self-employed or have other income, you will receive 1099 forms (such as 1099-NEC for contract work or 1099-INT for interest income).

You will also need records of deductions you plan to claim. Common ones include mortgage interest statements (Form 1098), student loan interest documentation, charitable donation receipts, and medical expense records. If you have dependents, gather their Social Security numbers. Keep pay stubs from throughout the year as backup for the income figures on your W-2 or 1099.

If you received any tax credits — such as the Earned Income Tax Credit (EITC) or Child Tax Credit — gather documentation that supports those claims, such as proof of childcare expenses or proof of income for the EITC.

How filing works step by step

Filing begins with choosing a method: paper, tax software, a tax preparer, or the IRS Free File program. Most people use software or a preparer because it is faster and reduces errors. You will enter your personal information (name, address, Social Security number), your income from all sources, and any deductions or credits you are claiming.

The software or preparer calculates your tax liability — the total tax you owe based on your income and deductions. It then subtracts any tax already withheld from your paychecks or paid through quarterly estimated tax payments. The result is either a refund owed to you, an amount you owe to the IRS, or a break-even.

Once you have completed and reviewed your return, you sign it (electronically if filing online, by hand if mailing) and submit it to the IRS. The IRS processes your return and either sends you a refund or bills you for what you owe. Processing typically takes a few weeks to a few months depending on the method you used and whether the IRS needs to verify information.

The difference between standard and itemized deductions

When you file, you choose between taking the standard deduction or itemizing deductions. The standard deduction is a fixed dollar amount set by the IRS each year that reduces your taxable income automatically. For 2024, the standard deduction varies by age and filing status — for example, it is higher if you are over 65 or filing as head of household.

Itemizing means adding up your individual deductions (mortgage interest, property taxes, charitable donations, medical expenses) and subtracting that total instead. You itemize only if your total deductions exceed the standard deduction for your situation, because doing so saves you more money. Most people use the standard deduction because it is simpler and often results in a larger deduction.

Filing deadlines and extensions

The standard deadline to file your federal tax return is April 15 of the year following the tax year. For example, you file your 2023 taxes by April 15, 2024. If April 15 falls on a weekend or holiday, the deadline moves to the next business day.

If you cannot file by April 15, you can request an automatic extension by filing Form 4868 with the IRS. An extension gives you until October 15 to file your return. However, an extension to file is not an extension to pay — if you owe tax, you should estimate what you owe and pay it by April 15 to avoid penalties and interest. Filing late without an extension results in a failure-to-file penalty.

What happens after you file

After you submit your return, the IRS processes it. If you are owed a refund, the IRS will send it to you by mail or direct deposit (if you provided banking information) within a few weeks to several months, depending on the method you used to file and whether the IRS needs to verify any information.

If you owe tax, the IRS will send you a bill. You can pay in full by the deadline or set up a payment plan if you cannot pay all at once. If you made an error on your return, the IRS may contact you to correct it or may adjust your return on its own. You can also amend your return yourself using Form 1040-X if you discover a mistake after filing.

Frequently Asked Questions

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

It depends on how much you earned and your filing status. The IRS sets minimum income thresholds — if your income is below that threshold, you are not required to file. However, if taxes were withheld from your paychecks, filing may get you a refund even if you earned below the threshold, so it can still be worth doing.

What is the difference between filing and paying taxes?

Filing is submitting a return to the IRS that reports your income and calculates what you owe. Paying taxes is sending money to the IRS. Most people pay taxes throughout the year via paycheck withholding, then file a return to settle up. Filing determines whether you have paid enough, too much, or too little.

Can I file my taxes myself or do I need a preparer?

You can file yourself using tax software, by paper form, or with a preparer. Many people use software because it guides you through the process and catches common errors. The IRS Free File program offers free software to people earning below a certain income threshold. A preparer is helpful if your situation is complex or you prefer professional help.

What happens if I file late?

Filing late without an extension results in a failure-to-file penalty, which is a percentage of the tax you owe. The penalty increases the longer you wait. If you owe tax and file late, you also owe interest on the unpaid amount. Requesting an extension by April 15 avoids the failure-to-file penalty, though you still owe any tax due by April 15.

Can I change my return after I file it?

Yes, you can file an amended return using Form 1040-X if you discover an error or forgot to claim a deduction or credit. You generally have three years from the original filing date to amend a return and claim a refund, though you can file an amended return to report additional tax owed at any time.