When the IRS Starts and Stops Accepting Tax Returns Each Year

The IRS filing season runs from late January through mid-April in most years

The IRS typically begins accepting tax returns in late January and stops accepting them on April 15 (or the next business day if April 15 falls on a weekend or holiday). The exact start date shifts slightly each year because the IRS needs time to update its systems after the previous tax year closes. For the 2024 tax year, the IRS began accepting returns on January 29, 2024. For 2025 returns, filing season opened January 27, 2025.

The April 15 important date is a hard stop — the IRS will not accept paper or electronic returns after that date unless you have filed for an extension. If you miss the important date without an extension, you owe a failure-to-file penalty on top of any taxes owed, even if you are due a refund.

The filing season window exists because tax forms and IRS systems need updating after each calendar year ends. Employers and financial institutions must send you documents like W-2s and 1099s by January 31, so the IRS waits until late January to may support those documents are in the system before opening the filing season.

Key Takeaways

The IRS opens for tax returns in late January each year (January 27 for 2025 returns) and closes on April 15 unless you file for an extension.
You can file your return as soon as you have all required documents, which typically arrive by January 31.
Filing an extension moves your important date to October 15, but it extends only the time to file, not the time to pay taxes owed.
If you file after April 15 without an extension, you face a failure-to-file penalty even if you are owed a refund.
The IRS accepts returns electronically year-round through tax software and tax professionals, but the official filing season window is when most people file.

Why the IRS does not accept returns before late January

The IRS cannot process returns before late January because employers, banks, and investment firms are still sending in the documents you need to file accurately. Your employer must send your W-2 by January 31. Banks and brokerages must send 1099 forms (for interest, dividends, capital gains, and other income) by the same date. The IRS waits until late January to give these organizations time to deliver those documents and to load them into its systems.

If you file before you have received all your documents, you risk filing an incomplete return. You may have to file an amended return later if you discover unreported income, which costs time and can trigger an audit. The IRS recommends waiting until you have all documents in hand before filing.

What happens if you file after April 15 without an extension

Filing after April 15 without an extension triggers the failure-to-file penalty. This penalty is typically 5 percent of the unpaid tax for each month (or part of a month) that your return is late, up to a maximum of 25 percent. The penalty applies even if you are owed a refund — you straightforward lose the refund or have it applied to other debts.

You also owe interest on any unpaid taxes from April 15 onward, compounded daily. The interest rate is set quarterly by the IRS and varies. For 2024 and 2025, the rate has been 8 percent per year.

If you cannot file by April 15, requesting an extension is straightforward and costs nothing. An extension moves your important date to October 15 and stops the failure-to-file penalty from accruing.

How to request an extension if you cannot file by April 15

You request an extension by filing Form 4868 (process for Automatic Extension of Time to File U.S. Individual Income Tax Return) with the IRS. You can file this form electronically through tax software, by mail, or through a tax professional. Filing Form 4868 automatically gives you until October 15 to file your return — you do not need the IRS to approve it first.

The extension must be filed by April 15. If you file it after April 15, the IRS will not honor it, and you will owe the failure-to-file penalty.

An important detail: an extension to file is not an extension to pay. If you owe taxes, you should estimate what you owe and pay it by April 15, even if you file Form 4868. If you do not pay by April 15, you owe interest and penalties on the unpaid balance from that date forward. Paying what you estimate you owe stops interest from accruing on that amount.

Filing electronically versus by mail during tax season

The IRS processes electronic returns much faster than paper returns. An electronically filed return is typically accepted within 24 hours. A paper return can take four to six weeks to process, and the IRS will not begin processing it until after the filing season ends in mid-April if you mail it close to the important date.

Electronic filing also reduces errors because tax software catches common mistakes before you submit. If you file by mail and make an error, the IRS will contact you weeks or months later, delaying any refund.

You can file electronically through commercial tax software (such as TurboTax, H&R Block, or TaxAct), through a tax professional, or through the IRS Free File program if your income is below a certain threshold. The IRS Free File program is available only during the filing season window.

When to file early versus waiting until closer to April 15

Filing early has advantages: you receive your refund sooner, and you reduce the risk of identity theft (criminals sometimes file fraudulent returns using stolen Social Security numbers late in the season). Filing early also means you are not rushed if you discover you need additional documents.

The main reason to wait is if you are still receiving income documents. If you have rental income, self-employment income, or investment sales, those documents may arrive in February or early March. Filing before you have all documents means filing an amended return later.

If you owe taxes rather than receiving a refund, there is no advantage to filing early — you still owe the same amount on April 15 regardless of when you file. You can file anytime between late January and April 15.

Special situations that affect your filing important date

If you are a U.S. citizen or resident alien living abroad, you automatically get an extension to June 15 to file your return and pay any taxes owed. You do not need to request this extension — it is automatic. However, if you owe taxes, interest still accrues from April 15 onward.

If you are in the military and stationed outside the United States, you also get an automatic extension to June 15.

If you are a victim of a federally declared disaster, the IRS may extend your important date. The IRS announces these extensions on its website and through local media in affected areas.

Frequently Asked Questions

Can I file my 2024 tax return in 2025 if I missed the April 15 important date?

You can file late, but you will owe a failure-to-file penalty and interest on any unpaid taxes from April 15 onward. The IRS accepts late returns year-round, but the penalty continues to accrue. If you are owed a refund, filing late means you lose that refund or have it applied to other debts you owe.

What if April 15 falls on a weekend or holiday?

The IRS moves the important date to the next business day. If April 15 is a Saturday, the important date becomes Monday, April 17. If it is a Sunday, the important date becomes Monday, April 16. The IRS announces the exact important date each year on its website.

Do I have to file during the official filing season, or can I file anytime?

You can file anytime after you have your documents, but the IRS only officially accepts returns during the filing season window (late January through April 15). Tax software and tax professionals can file your return electronically outside this window if you have an extension, but standard filing happens during the season.

If I file an extension, do I still have to pay taxes by April 15?

Yes. An extension gives you until October 15 to file your return, but it does not extend the payment important date. If you owe taxes, you should pay by April 15 to avoid interest and penalties. You can estimate what you owe and pay that amount, then file your actual return by October 15.

What happens if I file my return but do not pay the taxes I owe?

You owe failure-to-pay penalties and interest on the unpaid balance from April 15 onward. The failure-to-pay penalty is typically 0.5 percent per month of the unpaid tax, up to 25 percent. Interest accrues daily at the IRS rate, which is currently 8 percent per year. The IRS will contact you about the unpaid balance and may place a lien on your property or garnish your wages.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.