File your Form 1040 with the IRS at the address that matches your state and filing method

Where you send your Form 1040 depends on whether you file by mail or electronically, and which state you live in. The IRS publishes a list of mailing addresses for each state in the instructions that come with Form 1040, and these addresses change slightly each year. If you file electronically through tax software or a tax professional, you do not mail anything — the software sends your return directly to the IRS.

The IRS processes returns faster when you file electronically. Paper returns take longer to process and are more likely to be delayed if there are errors. If you must file by mail, use the address listed in the Form 1040 instructions for your state, and keep a copy of what you send.

Key Takeaways

  • Electronic filing sends your return directly to the IRS through tax software or a tax professional, and the IRS accepts it the same day you submit it.
  • If you file by mail, use the state-specific address printed in the Form 1040 instructions that came with your tax package or read from IRS.gov.
  • The mailing addresses for paper returns change each year, so check the current year's instructions rather than using an address from a previous return.
  • Paper returns take four to six weeks to process, while electronic returns are typically processed within 21 days.
  • Always keep a copy of your return and any documents you mail, in case the IRS needs to contact you about your filing.

How to file electronically through tax software

Most people file electronically using tax preparation software like TurboTax, H&R Block, or TaxAct. These programs walk you through entering your income, deductions, and credits, then transmit your completed return to the IRS electronically. You do not print or mail anything. The software typically charges a fee unless you use a free option like IRS Free File, which is available to people whose income falls below a certain threshold each year.

When you file electronically, the IRS sends you an acknowledgment within 24 hours confirming that your return was received. This is not the same as approval — it only means the IRS has the file. You can check the status of your return using the IRS's "Where's My Refund?" tool on IRS.gov starting 24 hours after you file.

How to file by mail with a paper return

If you file by mail, you must use the correct mailing address for your state. The Form 1040 instructions booklet lists these addresses in a section called "Where to File." The address depends on whether you are owed a refund, whether you owe taxes, and which state you live in. Using the wrong address delays processing.

Print your completed Form 1040, sign and date it, and include any supporting documents the IRS requires — such as W-2s, 1099s, or schedules. Put everything in an envelope and mail it to the address listed in the instructions. The IRS recommends using certified mail with return receipt so you have proof the return was delivered. Keep a copy of everything you send for your records.

Finding the correct mailing address for your state

The IRS publishes mailing addresses in the Form 1040 instructions each year. You can find these instructions on IRS.gov by searching for "Form 1040 instructions" and the current tax year. The addresses are organized by state and filing status. Some states have multiple addresses depending on whether you are filing from within that state or from outside it.

Do not use an address from a previous year's return. The IRS changes these addresses periodically, and sending your return to an outdated address causes delays. If you cannot find the current instructions, call the IRS at 1-800-829-1040 and ask for the mailing address for your state.

What happens after you file

If you file electronically, the IRS typically processes your return within 21 days. If you file by mail, processing takes four to six weeks. During this time, the IRS checks your return for errors, matches your income information to W-2s and 1099s reported by employers and financial institutions, and calculates your refund or balance due.

If the IRS finds an error or needs more information, it will contact you by mail. The letter will explain what is needed and how to respond. If you are owed a refund, the IRS deposits it directly to your bank account if you provided banking information on your return, or mails a check if you did not.

Using a tax professional to file on your behalf

If you use a tax professional — such as a CPA, enrolled agent, or tax preparer — they file your return electronically on your behalf. You do not mail anything yourself. The tax professional handles the filing and communicates with the IRS if questions arise. You will receive a copy of your filed return from the tax professional for your records.

Tax professionals must have a Preparer Tax Identification Number (PTIN) issued by the IRS. You can verify that a tax preparer is authorized by checking the IRS directory of tax professionals on IRS.gov. If you hire someone to prepare your return, you are still responsible for the accuracy of the information on it, so review it carefully before the preparer files.

Frequently Asked Questions

Can I file my Form 1040 online instead of mailing it?

Yes. Most people file electronically using tax software or a tax professional. Electronic filing is faster, more find, and the IRS processes it within 21 days. You can use free software through IRS Free File if your income is below the threshold, or pay for commercial software like TurboTax or H&R Block.

What if I mail my return to the wrong address?

The IRS may forward it to the correct location, but this causes delays of several weeks. To avoid this, always check the current year's Form 1040 instructions for the correct mailing address for your state. If you realize you sent it to the wrong address, call the IRS at 1-800-829-1040 to report it.

Do I need to mail my W-2s and 1099s with my Form 1040?

No. If you file electronically, you do not send these documents at all — you enter the information from them into the tax software. If you file by mail, you do not mail the original documents either. Keep them in your records in case the IRS asks to see them later.

How do I know if the IRS received my mailed return?

If you mailed your return using certified mail with return receipt, the postal service will confirm delivery. You can also check the status of your return using "Where's My Refund?" on IRS.gov about four weeks after you mail it. If the IRS has not received it after six weeks, call 1-800-829-1040.