One of the most operationally important steps in the CP2000 process is also one of the most commonly mishandled: sending your response to the right address.

The IRS processes CP2000 responses at specific campus locations, and each notice includes a mailing address that routes to the campus handling your account. Sending your response anywhere other than that specific address – including a general IRS address you find online – risks processing delays that can cause your response to arrive too late or be misapplied to the wrong account.

This article explains where to find the correct mailing address, how it varies across different versions of the CP2000, how to use certified mail to protect the deadline, and what happens if a response is sent to the wrong location. Check here for forms and document templates. 

The First Rule: Use the Address on Your Specific Notice

The mailing address for your CP2000 response is printed on the notice itself. It is typically found in one of two locations:

• The return address block in the upper left or upper right corner of the first page of the notice
• The specific response instructions section of the notice, which may read “Mail your response to:” followed by the address

This address is specific to the IRS campus that generated your notice and is handling your account. Depending on where you live and how the IRS routes accounts internally, your notice may have been generated at the Ogden, Utah campus; the Austin, Texas campus; the Kansas City, Missouri campus; or one of several other processing centers. The campus on your notice is where your response must go.

Do not look up a general IRS mailing address online and assume it applies to your notice. The IRS maintains dozens of mailing addresses for different types of correspondence, and a CP2000 response sent to the wrong address may sit in a processing queue for a different type of correspondence, causing your response to miss the deadline even though it was mailed on time.

How the Address Varies Across CP2000 Notices

IRS campus routing for CP2000 responses is determined by the Service Center that processed your return, which in turn is determined by factors including your state of residence and the filing year. Because these routing determinations change over time and vary by account, there is no universal CP2000 response address that applies to all taxpayers.

Common IRS campus addresses that handle CP2000 responses include:

• Internal Revenue Service, AUR Unit, Ogden, UT 84201-0010
• Internal Revenue Service, AUR Unit, Austin, TX 73301-0010
• Internal Revenue Service, AUR Unit, Kansas City, MO 64999-0010

The specific address on your notice – including any suite number, stop code, or zip code extension – should be used exactly as printed. Do not abbreviate, substitute a different city at the same campus, or omit any line of the address.

ZIP code extensions (the four-digit suffix after the main ZIP code) are functionally important at IRS processing centers and route mail to the correct internal sort. Omitting the extension does not prevent delivery, but including it speeds internal routing.

Certified Mail: Why It Is Essential

The CP2000 response deadline is determined by the postmark date on your response, not the date the IRS receives and processes it. This means your response is timely if it is postmarked on or before the deadline, even if the IRS does not process it for several weeks afterward.

USPS certified mail with return receipt requested provides:

• A unique tracking number that allows you to verify delivery online through USPS
• A physical return receipt (green card) that is signed by the IRS upon receipt and mailed back to you
• A postmark date on your certified mail receipt that serves as documented proof of timely filing

If the IRS later questions whether you responded within the deadline, the certified mail receipt and the USPS tracking record are your evidence. Without certified mail, you have no independent proof of when the response was mailed – only your own records, which carry less weight in a dispute about timeliness.

Retain the following after mailing:

• The certified mail receipt issued at the post office, which shows the date of mailing
• The USPS tracking number
• A complete copy of everything you mailed – the response form, written explanation, and all exhibits
• The green card (PS Form 3811) when it is returned to you signed by the IRS

IRS-Designated Private Delivery Services

The IRS also accepts timely responses sent via private delivery services that it has designated as acceptable alternatives to USPS. As of the most recent IRS guidance, designated services include specific service types offered by FedEx, UPS, and DHL. Using these services provides a verifiable delivery timestamp equivalent to a postmark.

Important limitations apply:

• The IRS-designated services are specific – not all FedEx or UPS services qualify. FedEx First Overnight, FedEx Priority Overnight, FedEx Standard Overnight, FedEx 2Day, FedEx International Priority, and UPS Next Day Air, UPS Next Day Air Saver, UPS 2nd Day Air, and UPS 2nd Day Air A.M. are among the designated services, though this list is updated periodically. Confirm the current list at IRS.gov before using a private carrier.
• Private carriers cannot deliver to IRS P.O. box addresses. If your CP2000 response address is a P.O. box, use USPS. If it is a street address, private carriers can be used.
• Retain the carrier’s tracking confirmation and printed delivery record as you would a certified mail receipt.

Timing: When to Mail

The postmark rule gives you until the last day of the 60-day window to mail your response. Practically speaking, mailing at least several days before the deadline is advisable for the following reasons:

• Post office business hours limit same-day mailing for certified mail in the evening or on weekends. If the deadline falls on a Friday and you arrive at the post office after closing, you may miss the postmark window.
• Any error in the mailing – wrong envelope, missing exhibits, the wrong address – is easier to correct with time to spare.
• If the certified mail receipt shows the wrong date due to a post office processing error (uncommon but possible), having mailed several days early gives you a buffer.

The postmark deadline applies when the deadline falls on a non-business day as well. If the 60th day falls on a Saturday, Sunday, or federal holiday, the deadline extends to the next business day. However, do not rely on this extension unless your calendar calculation confirms it applies to your specific situation.

What Happens If Your Response Goes to the Wrong Address

If you inadvertently mail your response to the wrong IRS address – either a general IRS address or the correct campus but a wrong internal stop code – several things may happen:

• The IRS mail sorting system may reroute the correspondence internally to the correct unit, particularly if the envelope clearly identifies it as a CP2000 response and includes your Social Security number and notice number on the exterior
• The response may be delayed significantly while it is rerouted, potentially arriving after the deadline even if mailed on time
• In some cases, a misdirected response may not reach the AUR unit before the notice advances to the next stage

If you realize after mailing that you used the wrong address, take the following steps:

1. Call the IRS at the phone number on the CP2000 notice and explain that you mailed a response but may have sent it to the wrong address
2. Provide your notice number, Social Security number, and the date of mailing
3. Ask the representative to note in your account that a response was submitted and may be misdirected
4. Prepare a duplicate response package and mail it to the correct address via certified mail immediately, noting in a cover letter that this is a duplicate of a response previously mailed on [date] to [address used]

Sending a duplicate does not guarantee both will arrive, but it ensures the correct address has the best available chance of receiving timely documentation.

Separate Address for Payment

If you are paying any agreed balance with your response, note that the payment and the response form may go to different addresses. Many CP2000 notices include a payment voucher that specifies its own mailing address – separate from the AUR response address. Use the address on the payment voucher for any check payment, and send the signed response form and attachments to the AUR response address on the notice.

If you are paying by IRS Direct Pay at IRS.gov or through EFTPS, no payment voucher mailing is required. You can submit the payment online and mail the response separately.

For the complete checklist of how to prepare and mail your response package, see our article on CP2000 response mailing instructions. For a walkthrough of what happens after your response is received and processed by the IRS, see our guide on what happens after you respond to a CP2000.

Summary

Always mail your CP2000 response to the address printed on your specific notice – not a general IRS address. The address routes to the campus and internal unit handling your account. Use USPS certified mail with return receipt requested and retain the mailing date documentation. Private delivery services designated by the IRS are also acceptable if the response address is a street address rather than a P.O. box. Mail at least several days before the deadline to account for office hours and any logistical issues. If you suspect the response went to the wrong address, call the IRS immediately and mail a duplicate to the correct address.