You file your 1040 with the IRS, either by mail to a regional processing center or electronically through approved software or a tax professional

The IRS does not have a single office where all returns go. Instead, it routes paper returns to one of several regional processing centers based on your state and filing method. Electronic filing (called e-filing) goes directly into the IRS computer system and is processed faster than mail. You choose between three paths: file on your own using IRS-approved software, mail a paper return, or have a tax professional file for you.

The method you pick affects how long processing takes, whether you can track your return, and what happens if something is wrong. Electronic filing typically shows results within 21 days. Paper filing can take six to eight weeks or longer, especially during peak season in spring.

Key Takeaways

  • The IRS routes paper 1040s to regional processing centers based on your state; you find the correct address on the IRS website or your tax form instructions.
  • Electronic filing through IRS Free File, commercial software, or a tax professional is faster and lets you track your return status online.
  • If you file by mail, send your return certified mail with return receipt so you have proof the IRS received it.
  • You can file your 1040 starting January 1 each year, and the important date is usually April 15, though the IRS sometimes extends it.
  • The IRS Where's My Refund tool only works for e-filed returns; paper filers cannot track status until processing is complete.

Filing electronically through IRS Free File or approved software

Electronic filing is the fastest and most reliable method. The IRS operates a program called IRS Free File that partners with tax software companies to offer free filing to people who earn below a certain income threshold (the limit changes yearly). You go to IRS.gov, find the Free File link, and choose from a list of approved providers. Each one has slightly different features, but all transmit your return directly to the IRS.

If your income is above the Free File limit or you prefer a different software, you can purchase commercial tax software like TurboTax, H&R Block, or TaxAct. These charge a fee but often include state return filing and customer support. The software walks you through questions about your income, deductions, and credits, then files electronically on your behalf.

When you e-file, the IRS sends back an acknowledgment within 24 hours confirming receipt. You can then use the Where's My Refund tool on IRS.gov to check status. If you are owed a refund, you can choose direct deposit to your bank account (fastest) or request a check by mail.

Mailing a paper 1040 to the correct regional center

If you file by mail, you must send your return to the right IRS processing center for your state. The address depends on whether you live in the United States or abroad, and which state you claim as your residence. The IRS publishes the correct mailing address in the instructions that come with the 1040 form itself, and also on IRS.gov under "Where to File."

For example, if you live in California and do not owe taxes, your return goes to the Fresno, California processing center. If you live in New York and do owe taxes, it goes to the Andover, Massachusetts center. The instructions list every state and every scenario, so check them before you mail.

Always mail your return certified mail with return receipt requested. This costs a few dollars but gives you proof that the IRS received it. Keep the receipt until you see your return processed. Paper returns take longer to process — often six to eight weeks during tax season — and you cannot track progress online. The IRS will contact you by mail if there are questions.

Using a tax professional or CPA to file for you

A tax professional — whether a CPA, enrolled agent, or tax preparer — can file your 1040 electronically on your behalf. You meet with them, provide your documents, and they handle the filing. They file using their own software and credentials, so the return goes to the IRS as an e-filed return.

This method costs money (fees vary widely by preparer and complexity), but it can save time if your situation is complicated or you are unsure about deductions. The professional is responsible for accuracy, and they usually offer to amend your return if the IRS finds an error. You still receive the refund in your name; the preparer does not intercept it.

To find a tax professional, you can search the IRS directory of enrolled agents, ask your accountant, or use the National Association of Certified Public Accountants website. Make sure anyone you hire has a Preparer Tax Identification Number (PTIN) and is registered with the IRS.

What documents to include with a paper return

If you mail your 1040, you must include certain documents depending on your situation. Always include a copy of any W-2 forms from employers, 1099 forms for other income (interest, dividends, self-employment), and receipts or statements for deductions you claim. Do not send originals — send copies only.

The 1040 instructions list exactly which forms and schedules you need based on your income type. For example, if you have capital gains, you include Schedule D. If you claim the earned income tax credit, you include Schedule EIC. If you are self-employed, you include Schedule C and Schedule SE. Attach these in the order the instructions specify.

Write your Social Security number on every page. Use a mailing envelope large enough that you do not have to fold the return. Do not staple pages together; use a paper clip instead. The IRS scans these returns, and staples can jam the machines.

Tracking your return after filing

If you e-filed, you can track your return using Where's My Refund on IRS.gov. You enter your Social Security number, filing status, and the refund amount. The tool updates every 24 hours and tells you whether the return has been received, is being processed, or has been approved. Once approved, it shows the refund date.

If you filed by mail, you cannot track your return online. The IRS will contact you by mail if there are questions or if your return is approved. If you included a return receipt with your mailed return, you at least have proof of the date it arrived. Processing times for paper returns are longer, especially during March and April.

If your refund does not arrive by the expected date, contact the IRS at 1-800-829-1040. Have your Social Security number, filing status, and the refund amount ready. The IRS can tell you whether the return was received and what stage it is in.

Special situations: filing from abroad or as a nonresident

If you are a U.S. citizen living outside the United States, you still file a 1040 with the IRS. The mailing address is different — returns from abroad go to a specific IRS address in Austin, Texas. You can also e-file from abroad using approved software or a tax professional.

If you are a nonresident alien (not a U.S. citizen and not a permanent resident), you may file a different form depending on your income type and whether you have a U.S. tax number. The IRS website has a section for nonresident filers that explains which form to use. Many nonresident filers use a tax professional because the rules are more complex.

Frequently Asked Questions

Can I file my 1040 before January 1?

No. The IRS does not accept returns before January 1 each year, even if you have all your documents ready. The filing season opens January 1 and closes April 15 (or the next business day if April 15 falls on a weekend). If you file early in January, you may receive your refund faster because the IRS has fewer returns to process.

What if I miss the April 15 important date?

You can request an automatic extension by filing Form 4868 before April 15. This gives you until October 15 to file your return. However, an extension to file is not an extension to pay — if you owe taxes, you should pay by April 15 to avoid penalties and interest. File the extension even if you cannot pay the full amount.

Is IRS Free File really free, or are there hidden fees?

IRS Free File is genuinely free for federal return filing if you meet the income limit. Some providers charge extra for state return filing or add-ons like audit support, but the federal return itself has no fee. Read the terms for each provider before you start, because they vary.

Do I need to mail my W-2s and 1099s with my paper return?

Yes, you must include copies of all W-2s and 1099s with a mailed return. The IRS also receives copies directly from your employer and financial institutions, so they will cross-check. If your copies do not match what they received, the IRS will contact you. Always keep originals for your records.

How do I know if my e-filed return was actually received?

The tax software or preparer will send you an acknowledgment within 24 hours of filing. This acknowledgment includes a confirmation number. You can also check Where's My Refund on IRS.gov using your Social Security number and refund amount. If the return shows up there, it was received.