The IRS filing season typically opens in late January and runs through April 15

The IRS usually begins accepting returns in late January or early February each year. The exact start date shifts slightly year to year because it depends on when the IRS finishes testing its systems and when certain tax documents (like W-2s and 1099s) must be filed by employers and financial institutions. For the 2024 tax year, the IRS started accepting returns on January 29. For 2025, it began January 27.

The filing deadline is almost always April 15, though it moves to April 16 or 17 in years when April 15 falls on a weekend or when a federal holiday falls on a Monday or Friday. If you file after April 15, you owe a late-filing penalty unless you have an extension. You can request an automatic six-month extension by filing Form 4868, which pushes your deadline to October 15, but this extends only the time to file — not the time to pay any taxes owed.

The window between opening day and April 15 is roughly 2.5 to 3 months. This is the period when the IRS is actively processing returns, issuing refunds, and accepting payments. After April 15, the IRS still accepts returns, but they are considered late and subject to penalties and interest.

Key Takeaways

  • The IRS opens its filing season in late January each year, with the exact date varying between January 27 and early February depending on when systems testing is complete.
  • April 15 is the standard deadline to file, though it shifts to April 16 or 17 when the 15th falls on a weekend or holiday.
  • Filing after April 15 triggers a late-filing penalty of 5% per month (up to 25%) plus interest on any unpaid tax, even if you are owed a refund.
  • You can file Form 4868 to request a six-month extension, moving your deadline to October 15, but this does not extend the time to pay taxes owed.
  • The IRS continues to accept returns after April 15, but the longer you wait, the more penalties and interest accumulate.

Why the IRS opens late and what happens before January

The IRS does not open filing season on January 1 because employers, banks, and other institutions need time to prepare and send out tax documents. Your employer must send you a W-2 by January 31. Your bank or investment firm must send you a 1099 by the same date. The IRS itself needs time to update its computer systems, test them for errors, and prepare to handle the volume of returns that will arrive.

Before the filing season opens, you can still gather documents and prepare your return. Many people use this time to collect receipts, organize charitable donations, or meet with a tax professional. However, you cannot electronically file your return with the IRS until the season officially opens. If you try to file early, the IRS will reject it.

Some tax software allows you to prepare your return before the season opens, so you can file the moment the IRS begins accepting returns. This can be useful if you expect a large refund and want it as soon as possible.

How refunds are processed during filing season

Once you file, the IRS typically issues refunds within 21 days if you file electronically and choose direct deposit to your bank account. This is the fastest method. If you file on paper or request a check, the timeline stretches to several weeks or longer, depending on mail delays and processing volume.

Refunds are not issued on a first-come, first-served basis. The IRS processes returns in batches and may hold your refund if your return is flagged for review — for example, if you claim the Earned Income Tax Credit or if there are inconsistencies in your documents. These holds can add weeks or months to your refund.

The IRS publishes a "Where's My Refund?" tool on its website where you can check the status of your return using your Social Security number, filing status, and the refund amount. This tool updates once per day and is the most reliable way to track your refund.

What happens if you file after April 15

Filing late triggers a failure-to-file penalty of 5% of your unpaid tax for each month or part of a month that your return is late, up to a maximum of 25%. This penalty applies even if you are owed a refund. Additionally, the IRS charges interest on any unpaid tax at a rate set quarterly (currently around 8% annually, though this changes). Interest accrues from the original due date until you pay.

If you file late but are owed a refund, you will still receive it, but the refund may be reduced by any taxes, penalties, or debts you owe to federal or state agencies. The IRS can also use your refund to offset unpaid child support, student loans in default, or other federal debts.

The penalty is waived if you have reasonable cause — for example, a serious illness, a death in the family, or reliance on a tax professional who made an error. You must explain the reason in writing when you file or contact the IRS afterward. The IRS does not automatically waive penalties, so you have to request it.

Filing an extension to move your deadline to October

If you cannot file by April 15, you can request an automatic six-month extension by filing Form 4868 (Application for Automatic Extension of Time to File U.S. Individual Income Tax Return). This form is simple: you estimate your tax liability, calculate what you owe, and submit the form to the IRS by April 15. If you file the form on time, your new deadline becomes October 15.

The extension applies only to filing, not to payment. If you owe tax, you must pay it by April 15 to avoid interest and penalties, even if you have an extension. If you cannot pay the full amount, pay what you can by April 15 and the IRS will charge interest on the remainder. Filing the extension does not stop interest from accruing.

You can file Form 4868 electronically through tax software, by mail, or by phone in some cases. Many tax professionals file it automatically for clients who request an extension. If you file an extension and then file your actual return before October 15, you will not be penalized.

State filing deadlines and variations

Most states follow the federal April 15 deadline for income tax returns. However, some states do not have an income tax (including Texas, Florida, and Wyoming), so there is no state return to file. A few states have different deadlines or different rules for extensions.

If you live in a state with an income tax, check your state's tax agency website for the exact deadline and extension rules. Some states allow a longer extension than the federal six months. If you file a federal extension, you should also file a state extension in most cases, even though the forms may be separate.

If you move to a new state during the tax year, you may owe tax to both your old state and your new state. The rules vary by state, so consult your state's tax agency or a tax professional for guidance.

What to do if you miss the deadline

If April 15 passes and you have not filed, file your return as soon as possible. The longer you wait, the more interest and penalties accumulate. The IRS does not forgive these charges simply because time has passed.

When you file late, include a written explanation of why you missed the deadline if you believe you have reasonable cause. Attach it to your return or include it in a cover letter. Common reasons the IRS accepts include serious illness, death in the family, fire or natural disaster, or reliance on a tax professional who made an error. Lack of knowledge about the deadline or procrastination are not considered reasonable cause.

If the IRS has already assessed penalties and you believe you have reasonable cause, you can request penalty relief by filing Form 843 (Claim for Refund and Request for Abatement) or by calling the IRS at 1-800-829-1040. The IRS reviews these requests individually and may reduce or eliminate penalties in some cases.

Frequently Asked Questions

Can I file my return before the IRS opens filing season?

No. If you submit your return electronically before the IRS opens, it will be rejected. You can prepare your return in tax software before the season opens, but you cannot transmit it to the IRS until the official start date. Paper returns can be mailed anytime, but the IRS will not process them until after the season opens.

What if I owe money instead of getting a refund — do I still have until April 15?

Yes. Whether you owe or are owed a refund, the deadline to file is April 15. However, if you owe tax, you must pay it by April 15 to avoid interest and penalties. Filing an extension moves your filing deadline to October 15, but not your payment deadline.

How long does it take to get a refund if I file on paper?

Paper returns take significantly longer than electronic returns — typically four to six weeks or more, depending on mail delays and processing volume. The IRS recommends filing electronically with direct deposit for the fastest refund, which usually arrives within 21 days.

Do I need to file if I did not earn much income?

It depends on your income level and filing status. The IRS sets a threshold each year below which you do not have to file. However, if you had taxes withheld from your paychecks or are owed a refundable credit like the Earned Income Tax Credit, you should file to claim your refund, even if you are not required to.

What happens if I file my extension but then forget to file my actual return by October 15?

The same penalties apply. If you miss October 15, you owe a failure-to-file penalty of 5% per month on any unpaid tax, plus interest. File as soon as possible and include a written explanation of the delay. You can request penalty relief if you have reasonable cause.