When the IRS Starts Processing Your Tax Return

The IRS typically begins accepting and processing returns in late January each year

The IRS opens its filing season around late January, though the exact date shifts slightly year to year. For the 2024 tax year, the IRS began accepting returns on January 29, 2024. For 2025, filing season opened January 27, 2025. The agency does not process returns before this date, even if you file earlier — your return sits in a queue until the season officially opens.

Once the season opens, the IRS does not process all returns at the same speed. Returns filed electronically move faster than paper returns. A straightforward return with no errors or missing information typically processes within 21 days of filing electronically. Paper returns take much longer — often 4 to 6 weeks or more, depending on the volume the IRS is handling.

The IRS processes returns in waves throughout the season, not all at once. If you file in early February, your return may be processed within weeks. If you file in April, processing can take longer because the agency is handling millions of returns simultaneously as the April 15 deadline approaches.

Key Takeaways

The IRS opens its filing season in late January each year and does not process returns filed before that date, even though some tax software lets you file early.
Electronic returns typically process within 21 days if they contain no errors or missing information, while paper returns take 4 to 6 weeks or longer.
The IRS processes returns in batches throughout the season, so filing early in the season usually means faster processing than filing close to the April 15 deadline.
You can track your return's status using the IRS "Where's My Refund?" tool on IRS.gov, which updates once per day and shows processing status and expected refund date.
If your return requires manual review — because of math errors, missing information, or certain credits — processing takes significantly longer, sometimes several months.

Why the IRS waits until late January to start processing

The IRS does not open filing season until late January because employers and financial institutions need time to send out tax documents. W-2 forms from employers must be mailed by January 31. 1099 forms from banks, investment firms, and other payers have a deadline of January 31 as well. The IRS waits until late January to ensure these documents are in the mail before it begins processing returns that depend on them.

This delay also gives the IRS time to update its systems and prepare for the volume of returns coming in. The agency uses the weeks before filing season to test software, train staff, and make sure its computers can handle the millions of returns that will arrive in the next few months.

How long processing actually takes, step by step

When you file electronically, your return goes through several stages. First, the IRS receives and scans your return into its system — this happens within a few hours of filing. Next, the IRS runs automated checks to look for math errors, missing information, or inconsistencies. If your return passes these checks, it moves to the next stage.

If the IRS finds a problem during automated review, your return is flagged for manual review by an IRS employee. This is where processing slows down. A return flagged for review can take weeks or months to clear, depending on what the issue is and how busy the IRS is. Common reasons for manual review include claiming certain tax credits, reporting self-employment income, or having income from multiple sources.

Once your return clears all reviews, the IRS approves it and sends your refund to your bank or mailing address. If you chose direct deposit, the refund usually arrives within a few business days after approval. If you requested a paper check, it takes 7 to 10 business days after approval.

Paper returns take much longer than electronic ones

If you file a paper return, add significant time to every stage. Paper returns must be physically mailed to an IRS processing center, received, opened, and scanned by hand into the IRS system. This alone can take 2 to 3 weeks. After scanning, your return goes through the same automated and manual review as electronic returns, but the IRS processes paper returns in lower priority batches.

The IRS recommends filing electronically whenever possible. Electronic filing is faster, more accurate, and less likely to be delayed by mail delays or scanning errors. If you cannot file electronically, mail your return to the IRS processing center for your state — the address is on the IRS website and on the back of the tax form instructions.

Tracking your return while it processes

You can check the status of your return using the IRS "Where's My Refund?" tool on IRS.gov. This tool shows whether the IRS has received your return, whether it is being processed, and when your refund is expected to arrive. The tool updates once per day, usually overnight, so checking multiple times in a single day will not show new information.

The tool requires your Social Security number, filing status, and the exact refund amount from your return. If you do not know your refund amount, you can estimate it or check your tax software — most tax programs show the refund amount before you file.

If your return has been processing for longer than 21 days and the tool shows no status update, contact the IRS directly. You can call the IRS at 1-800-829-1040 or visit an IRS walk-in office. Have your Social Security number and return information ready when you call.

What causes delays in processing

Several issues can slow down your return. Math errors — even small ones — trigger manual review. Missing information, such as a missing signature or incomplete address, causes delays. Claiming certain tax credits, particularly the Earned Income Tax Credit or Child Tax Credit, often requires additional verification and takes longer to process.

Identity theft and fraud checks also delay returns. If the IRS suspects your return might be fraudulent, it holds the return for investigation. This can take weeks or months. You may receive a letter from the IRS asking you to verify your identity or provide additional documentation.

Amended returns take much longer than original returns. If you file an amended return (Form 1040-X), the IRS processes it separately and typically takes 8 to 12 weeks or longer, depending on the complexity of the changes.

Filing early versus filing close to the deadline

Filing early in the season — in February or early March — usually means faster processing because the IRS is not yet overwhelmed with returns. If you file in April, especially in the week before April 15, your return enters a queue with millions of others, and processing takes longer.

However, filing early only helps if your return is complete and error-free. If your return has errors or missing information, it will be delayed regardless of when you file. Make sure you have all necessary documents before filing — your W-2s, 1099s, and any other income or deduction documentation.

If you cannot file by April 15, you can request an extension using Form 4868. An extension gives you until October 15 to file your return, but it does not extend the deadline to pay taxes owed. If you owe taxes, you should pay by April 15 even if you file late, to avoid penalties and interest.

Frequently Asked Questions

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

You can prepare and submit your return to tax software before filing season opens, but the IRS will not process it until after late January. Your return will sit in the software's queue until the IRS begins accepting returns. Filing early does not give you an advantage — the IRS processes it on the same timeline as returns filed after the season opens.

Why hasn't my refund arrived if it's been 21 days?

If 21 days have passed and your return was filed electronically, check the IRS "Where's My Refund?" tool to see if your return is still processing or if there is a problem. Common reasons for delays past 21 days include math errors, missing information, or a flag for manual review. If the tool shows no update after 21 days, contact the IRS at 1-800-829-1040.

Do I have to wait until late January to file my taxes?

You can file your return anytime during the year, but the IRS will not process it until filing season opens in late January. If you have all your documents ready in December, you can prepare your return, but submitting it to the IRS before late January will not speed up processing. You may want to wait until you have received all your W-2s and 1099s anyway.

What if I filed a paper return and it's been more than 6 weeks?

Paper returns take 4 to 6 weeks or longer depending on IRS volume. If more than 6 weeks have passed, use the "Where's My Refund?" tool or call the IRS at 1-800-829-1040. Have your Social Security number and return information ready. The IRS may need to locate your return in its system or investigate if it was received.

Does filing electronically really make a difference in processing time?

Yes. Electronic returns process in about 21 days if error-free, while paper returns take 4 to 6 weeks or longer. Electronic filing also reduces the chance of errors because tax software catches many mistakes before you submit. The IRS strongly recommends electronic filing for this reason.

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.