What You Need Before You File

Before you sit down to file, gather the documents that show your income for the year. These include W-2 forms from employers, 1099 forms for self-employment or contract work, bank statements showing interest earned, and brokerage statements for investment income. If you received unemployment benefits, you'll have a 1099-U form. If you paid student loan interest or made charitable donations, keep those records too.

You'll also need your Social Security number, date of birth, and filing status (single, married filing jointly, married filing separately, head of household, or may have access to widow or widower). If you're claiming dependents, have their Social Security numbers and birth dates ready. If you're filing jointly with a spouse, both of you will need to sign the return, so coordinate timing if one of you files electronically and the other by mail.

The IRS publishes a checklist each year on IRS.gov that lists exactly what documents you need based on your situation. read it before you start — it's more reliable than a general list because tax law changes annually.

Key Takeaways

  • You need income documents (W-2s, 1099s), identification information, and records of deductions or credits you plan to claim before you begin.
  • The IRS important date to file is usually April 15, but you can request an automatic extension to October 15 by filing Form 4868.
  • You can file electronically through tax software, a tax professional, or free IRS tools if your income is below a certain threshold.
  • The 1040 form itself is the main form, but you may need to attach schedules (like Schedule C for self-employment) depending on your income sources.
  • If you owe money, you can pay in full by the important date or set up a payment plan with the IRS.

When Do I Have to File?

The standard important date is April 15 of the year following the tax year you're reporting. For example, you file your 2024 taxes by April 15, 2025. If April 15 falls on a weekend or federal holiday, the important date moves to the next business day.

You can request more time by filing Form 4868 (process for Automatic Extension of Time to File U.S. Individual Income Tax Return) before the April 15 important date. This gives you until October 15 to file. Filing Form 4868 does not extend the important date to pay taxes you owe — if you expect to owe money, you should estimate and pay it by April 15 anyway to avoid penalties and interest.

Some people are not required to file at all. The IRS sets income thresholds each year based on your age and filing status. If your income is below the threshold for your situation, you don't have to file, though you may still want to if you paid taxes through withholding or are claiming a refundable credit.

Where Do I File and How?

You have three main routes: file electronically using tax software, file by mail, or work with a tax professional. Electronic filing is faster — the IRS typically processes e-filed returns within 21 days, while paper returns take much longer. The IRS Free File program offers free tax software to people whose income falls below a certain threshold (the threshold changes yearly and is posted on IRS.gov).

If you file by mail, print the 1040 form and any schedules you need, sign and date them, and mail them to the IRS address for your state. The address depends on whether you're including a payment or a refund request, so check the instructions that come with the form. Keep a copy for your records.

Tax professionals — accountants, enrolled agents, or tax preparers — can file on your behalf. They charge a fee, but they handle the entire process and may find deductions or credits you missed. If you choose this route, you still need to gather your documents and provide them to the professional; they don't retrieve them for you.

What Schedules Do I Need to Attach?

The 1040 is the main form, but depending on your income sources and deductions, you may need to file additional schedules. Schedule C is for self-employment income. Schedule D is for capital gains and losses from investments. Schedule 1 is for other income like rental income, prizes, or gambling winnings. Schedule A is for itemized deductions (mortgage interest, property taxes, charitable donations) if you choose to itemize instead of taking the standard deduction.

The instructions that come with the 1040 tell you which schedules explore to your situation. If you're using tax software, the program asks questions about your income and automatically includes the right schedules. If you're filing by hand or with a professional, ask which schedules you need before you file.

Not everyone needs schedules. If you have only W-2 income and take the standard deduction, you may file just the 1040 itself. The standard deduction amount changes yearly and depends on your age and filing status.

What's the Difference Between the Standard Deduction and Itemizing?

The standard deduction is a flat amount the IRS lets you subtract from your income before calculating tax. You don't have to prove anything or list what you spent — you just claim the amount for your filing status and age. The IRS sets this amount each year; it's higher for people 65 and older.

Itemizing means listing specific expenses you paid during the year — mortgage interest, property taxes, state and local taxes (up to a limit), charitable donations, and medical expenses above a threshold. You add these up on Schedule A and use that total as your deduction instead of the standard amount. Itemizing only makes sense if your total itemized deductions exceed the standard deduction for your filing status.

Most people use the standard deduction because it's simpler and results in a larger deduction. You can't claim both — you choose whichever is larger for your situation. Tax software calculates both and shows you which one saves you more money.

What If I Owe Money or Get a Refund?

If you owe money, you can pay in full by the April 15 important date using the IRS Direct Pay system, a credit or debit card (through an IRS-approved payment processor), or by mailing a check. If you can't pay in full, you can set up a short-term extension (120 days) or a long-term payment plan with the IRS. Payment plans have a setup fee and monthly payment amount, and interest accrues on the unpaid balance.

If you're getting a refund, the IRS deposits it directly to your bank account if you provide your routing and account numbers. Direct deposit is faster than a paper check. You can track your refund status on IRS.gov using the "Where's My Refund?" tool, which updates every 24 hours after you file.

Refunds typically arrive within 21 days of the IRS accepting your return if you file electronically. Paper returns take longer. If your refund doesn't arrive within the expected timeframe, check the IRS website or call the IRS to see if there's a delay.

Can I Amend My Return After I File?

Yes, you can file an amended return using Form 1040-X (Amended U.S. Individual Income Tax Return). You have three years from the original due date to file an amendment. For example, if you filed your 2024 return in April 2025, you can amend it until April 15, 2028.

You file Form 1040-X by mail — you cannot amend electronically through most tax software. The form shows your original numbers, the corrected numbers, and the difference. Attach any schedules that changed. Keep a copy and mail it to the IRS address for your state.

Common reasons to amend include forgetting to claim a deduction, discovering you made a math error, or receiving a corrected 1099 form from an employer or financial institution. If the amendment results in a refund, the IRS processes it like any other refund. If you owe more, you'll receive a bill with instructions to pay.

Frequently Asked Questions

Do I have to file if I'm claimed as a dependent on someone else's return?

It depends on your income. If you had earned income (from a job), you generally must file if your income exceeds the standard deduction for a dependent. If you had only unearned income (interest, dividends), the threshold is lower. Check the IRS instructions for your filing status, or use the IRS interactive tool on IRS.gov to determine whether you must file.

What happens if I file late?

If you file after the important date without requesting an extension, you may owe a failure-to-file penalty and interest on any taxes you owe. The penalty is usually 5% of the unpaid tax per month, up to 25%. If you filed Form 4868 before April 15, you have until October 15 without penalty. If you're getting a refund, there's no penalty for filing late, but you lose the refund if you don't file within three years.

Can I file my 1040 by hand instead of using software?

Yes. You can read the form and instructions from IRS.gov, print them, fill them out by hand, and mail them to the IRS. This takes longer to process and is more prone to errors, but it's free. If you choose this route, follow the instructions carefully and keep a copy for your records.

What if I receive a 1099 form but didn't actually receive the income?

Report it on your return anyway, then explain the discrepancy. If the income was reported in error, contact the person or business that issued the 1099 and ask them to send you a corrected form. Once you receive the corrected form, you can file an amended return. Do not ignore a 1099 — the IRS receives a copy too, and mismatches trigger notices.

Do I need to keep my receipts and documents after I file?

Yes. Keep all documents that support your return for at least three years from the filing date. This includes receipts, invoices, bank statements, and any forms you received. If the IRS audits your return, you'll need to show proof of the income and deductions you claimed. Some people keep records for seven years as a precaution, especially for business expenses or investment records.