Processing Delay — We Need More Time

What Is IRS Letter 2645C?

IRS Letter 2645C is a processing status update the IRS sends when your case is still under review and the agency needs additional time, typically 45 to 60 more days, to complete its work. This letter is not a bill, not a denial, and not a demand for payment. It is the IRS fulfilling its obligation under the Taxpayer Bill of Rights, codified in IRC §7803(a)(3), which guarantees every taxpayer the right to be informed about what is happening with their account.

Unlike most IRS notices that fall on either the collection track (where the IRS pursues payment of an assessed balance) or the examination track (where the IRS questions the accuracy of a return), Letter 2645C does not belong to either track. It is purely a processing status update. The IRS is simply telling you that your case is in the queue and they have not forgotten about it. This distinction matters because Letter 2645C does not create any new obligations, does not start or reset any statutory deadlines, and does not change your rights or options in any way. According to the IRS, the agency processes over 150 million individual tax returns and millions of additional requests each year. Processing delays are common, and Letter 2645C is the mechanism the IRS uses to keep you informed when your case requires more time than standard processing allows.

Why You Received IRS Letter 2645C

There are several common reasons the IRS sends Letter 2645C, and all of them share one characteristic: the IRS has received something from you (or on your behalf) that requires manual review and the processing queue is backed up. The most frequent triggers include amended return processing, where Form 1040-X filings currently carry a backlog of 12 to 20 months according to IRS processing statistics. If you filed an amended return and received Letter 2645C, it means the IRS has your amendment but has not yet assigned it to an examiner or completed the adjustments.

Other common triggers include an Offer in Compromise under review, which requires detailed financial analysis under IRC §6402 before the IRS can accept or reject the offer. Penalty abatement requests also generate 2645C letters because reasonable cause determinations require manual review of documentation. Identity theft cases, where the IRS must verify your identity and correct fraudulent filings, frequently result in multiple 2645C letters over a period of 120 to 180 days. Injured spouse claims under Form 8379, where one spouse seeks to recover their share of a joint refund that was applied to the other spouse's debt, also trigger extended processing and corresponding 2645C updates.

The IRS Taxpayer Advocate Service reported that processing delays remain one of the most significant challenges facing taxpayers, with millions of cases pending in IRS processing queues at any given time. The IRS authority to process these requests, including making credits and refunds, is governed by IRC §6402 and the general claims procedures outlined in IRM 21.5.1. Letter 2645C is the IRS acknowledgment that your request is pending under these procedures.

What You Should Do When You Receive Letter 2645C

In most cases, the correct response to Letter 2645C is to do nothing and wait. The IRS has told you they are working on your case and need more time. The single most important thing to avoid is submitting duplicate paperwork. Taxpayers who receive a 2645C letter sometimes assume the IRS lost their original submission and send a second copy of their amended return, their Offer in Compromise, or their supporting documentation. This is counterproductive. Duplicate submissions create confusion in the IRS processing system, can cause your case to be flagged for additional review, and almost always result in further delays rather than faster processing.

You should keep the letter for your records and note the date stated on it along with the estimated processing timeframe. Mark your calendar for the end of that window. If the IRS says they need 60 more days, set a reminder for day 65. If you hear nothing by that date, then it is appropriate to follow up. You should also verify that the letter references the correct tax year, form type, and Social Security number. While rare, IRS letters can be sent in error or routed to the wrong taxpayer. If the letter references a filing you did not submit, contact the IRS immediately using the phone number on the letter, as this could indicate identity theft or a processing error.

When to Follow Up with the IRS

If the timeframe stated in your Letter 2645C expires and you have not received a resolution letter, a refund, or any further correspondence, it is time to follow up. Call the specific phone number printed on your Letter 2645C, not the general IRS toll-free number. The number on your letter routes to the department handling your case, which means shorter wait times and more relevant answers. Have a copy of the letter, your Social Security number, and the relevant tax return available when you call.

If your case has been pending for significantly longer than normal processing times, you may be eligible for assistance from the Taxpayer Advocate Service (TAS). TAS is an independent organization within the IRS that helps taxpayers who are experiencing economic harm, who are seeking help resolving problems that have not been resolved through normal IRS channels, or who believe an IRS system or procedure is not working as it should. You can contact TAS by calling 1-877-777-4778 or by filing Form 911 (Request for Taxpayer Advocate Service Assistance). If you are working with a tax professional, they can use the Practitioner Priority Service (PPS) line to reach the IRS more efficiently and inquire about case status on your behalf.

How Letter 2645C Connects to Other IRS Notices

Letter 2645C may arrive between other notices in an ongoing sequence, and it is critical to understand that it does not reset or extend deadlines from any prior notice you received. If you have a pending response deadline from a CP2000, a statutory notice of deficiency, or any other time-sensitive IRS notice, that deadline still applies regardless of whether you receive a 2645C in the interim. Letter 2645C is an independent communication about processing status and has no effect on the legal deadlines established by other notices.

For example, if you filed an amended return and simultaneously have an unpaid balance generating collection notices (CP14, CP501, CP503), the 2645C about your amended return does not pause or delay the collection sequence on your balance due. These are separate IRS processes running in parallel. Similarly, if you submitted an Offer in Compromise and received a 2645C about processing, the OIC review timeline operates independently from any other notices you may receive about different tax years or issues.

When to Get Professional Help

A single Letter 2645C usually does not require professional assistance. It is a routine processing update, and in most cases, the IRS will resolve your request within the stated timeframe. However, if you have received multiple 2645C letters over a period of several months with no resolution, this is a sign that your case may be stuck in a processing loop. This happens more frequently with complex filings such as multi-year amended returns, Offers in Compromise with unusual asset structures, or identity theft cases involving multiple tax years.

A licensed tax professional can escalate your case through channels that are not available to individual taxpayers. The Practitioner Priority Service line provides tax professionals with faster access to IRS representatives who can pull up your case and provide specific status details. If your case qualifies, a tax professional can also file a Taxpayer Advocate Service request on your behalf, which assigns a dedicated advocate to work your case through to resolution. Our attorney-backed team at Tax Forgiveness Pro regularly handles cases where IRS processing has stalled, and we can review your situation in a free consultation.

You should also consider professional help if the underlying matter behind your 2645C involves significant financial stakes, such as a large refund claim, a penalty abatement request on a substantial balance, or an Offer in Compromise. In these situations, a tax resolution professional can ensure your original submission was complete and accurate, monitor the case through processing, and respond quickly if the IRS requests additional information. The cost of professional representation is often far less than the cost of a delayed or denied claim that could have been resolved with proper follow-up.