Introduction – What Is Publication 4038?
IRS Publication 4038, titled “Business Tax Return Processing Migration Map / Individual Tax Return Processing Migration Map,” is an official geographic routing guide published by the Internal Revenue Service. For taxpayers and tax professionals who file paper tax returns, knowing where to send completed forms is essential. Publication 4038 provides color-coded, state-by-state maps illustrating exactly which regional IRS processing campus handles paper returns for each state.
The primary purpose of Publication 4038 is to ensure that paper tax returns filed without payments are directed to the correct submission processing centers. Over recent decades, the IRS launched a major initiative to consolidate paper processing operations from ten historical service centers down to three modernized mega-campuses. Publication 4038 visually maps out this operational migration, helping filers avoid mailing paperwork to closed facilities and preventing multi-month processing delays.
Who Should Read This Publication?
Publication 4038 is designed for anyone responsible for preparing, addressing, and mailing paper federal tax returns to the government. While electronic filing is now the standard for most Americans, millions of paper forms are still mailed each year.
This publication is particularly relevant for:
- Individual Taxpayers: Filers submitting paper Forms 1040 or 1040-SR that show a refund or zero balance due.
- Small Business Owners: Corporate officers, partners, and sole proprietors mailing business returns (such as Forms 1120, 1120-S, or 1065) without payments.
- Payroll and Bookkeeping Staff: Personnel mailing quarterly employment tax returns (Form 941) or annual unemployment returns (Form 940).
- Tax Preparers and Accountants: CPAs and enrolled agents who print paper returns for clients who choose not to file electronically.
- Mailroom and Office Administrators: Clerical staff responsible for addressing envelopes and verifying postal delivery destinations for company tax filings.
Key Topics Covered
Publication 4038 is structured as a two-page visual document. Page one covers the Business Tax Return Processing Migration Map, while page two displays the Individual Tax Return Processing Migration Map. Together, they illustrate how the nation is divided among active processing centers.
The core subjects detailed in the publication include:
- Submission Processing Consolidation: The multi-year plan migrating paper tax intake away from older regional centers into specialized processing hubs.
- Business Filing Destinations: Specific state allocations routing corporate, partnership, and payroll forms primarily to Ogden, Utah, and Kansas City, Missouri.
- Individual Filing Destinations: Geographic allocations routing individual tax returns to Austin, Texas; Kansas City, Missouri; or Ogden, Utah.
- The Critical Payment Distinction: Explicit instructions explaining that the migration maps apply only to returns filed without payment.
- Coordination with Lockbox Centers: Guidance directing payment-bearing returns away from processing campuses and toward commercial depository lockboxes.
The table below provides a quick reference comparing the primary filing destinations and functions outlined in Publication 4038:
| Return Category | Primary Processing Campuses (Publication 4038) | Enclosed Payment Rule | Alternative for Returns with Payment |
|---|---|---|---|
| Individual Returns (Form 1040 series) | Austin, TX; Kansas City, MO; Ogden, UT | No payment enclosed (refund or zero balance) | Mail to designated Lockbox address in Publication 3891 |
| Corporate Returns (Form 1120 series) | Kansas City, MO; Ogden, UT | No payment enclosed | Mail to designated Lockbox address in Publication 3891 |
| Partnership Returns (Form 1065) | Kansas City, MO; Ogden, UT | Information return (no tax balance due) | Not applicable (sent to processing campus) |
| Payroll Returns (Form 941 series) | Kansas City, MO; Ogden, UT | No payment enclosed | Mail to designated Lockbox address with Form 941-V |
Detailed Breakdown of Main Concepts
1. The IRS Processing Center Consolidation
Historically, the IRS operated ten large paper processing centers across the country, including facilities in Andover, Massachusetts; Brookhaven, New York; Atlanta, Georgia; Fresno, California; and Cincinnati, Ohio. As the vast majority of taxpayers shifted to electronic filing, maintaining ten separate paper-handling centers became costly and inefficient.
The IRS implemented a strategic consolidation plan to “migrate” paper processing into three primary campuses: Austin, Texas; Kansas City, Missouri; and Ogden, Utah. Publication 4038 illustrates how states formerly assigned to closed service centers have been reassigned to these remaining hubs.
2. Individual Return Routing (Page 2)
Page two of Publication 4038 maps out individual income tax filings (such as Form 1040 and Form 1040-SR) that do not include payments. The United States is split into three main processing regions based on geographic state groupings.
For example, taxpayers residing in western states typically route their returns to Ogden, Utah, while taxpayers in many midwestern and northeastern states send their forms to Kansas City, Missouri. Filers in southern states, including Texas and Florida, are generally directed to Austin, Texas. Checking the map ensures that your personal refund return lands at the exact campus assigned to your home state.
3. Business Return Routing (Page 1)
Page one of Publication 4038 displays the business migration map, which governs corporate income tax returns (Form 1120), S-corporation returns (Form 1120-S), partnership filings (Form 1065), and employment tax forms (Form 941). Business paper processing is concentrated primarily in two mega-campuses: Ogden, Utah, and Kansas City, Missouri.
The migration map visualizes how business returns from western and central states are grouped into Ogden, while eastern and southern business filers are routed to Kansas City. Because business returns often include complex schedules, statements, and attachments, directing them to the correct commercial processing center is essential for timely data entry.
4. The “No Payment” Rule
A fundamental rule highlighted on both maps in Publication 4038 is that these campus addresses are intended strictly for returns filed without an enclosed payment. If you are expecting a tax refund or filing an information return where zero tax is due, you follow the migration map.
IRS processing campuses are designed to scan documents, extract line-item data, and review tax calculations; they are not set up for high-speed check deposit. Enclosing a check to a processing campus creates administrative hurdles that can delay your check being deposited and your return being logged.
5. Coordination with Publication 3891 (Lockbox Addresses)
Publication 4038 explicitly references IRS Publication 3891, “Lockbox Address Directory,” for taxpayers submitting a return accompanied by a check or money order. When a payment is enclosed, the return must be mailed to a designated bank lockbox facility rather than a campus processing center.
Bank lockboxes use high-speed sorting and scanning equipment to deposit tax revenue directly into the U.S. Treasury on the day of arrival. By clearly distinguishing between processing campuses (Publication 4038) and payment lockboxes (Publication 3891), the IRS keeps check-clearing operations separate from tax return examination.
6. Avoiding the “Old Address” Trap
Many businesses and long-time filers keep pre-printed mailing labels or saved contact records from prior tax years. Publication 4038 serves as an essential warning against using outdated addresses from closed IRS centers like Fresno or Brookhaven.
When mail is sent to a decommissioned processing site, the postal service must forward the mail to an active campus, or the package may be returned to the sender. This forwarding process can add weeks to your processing timeline, potentially jeopardizing critical deadlines or delaying refund checks.
Practical Examples or Scenarios
Scenario 1: Mailing a Refund Return for an Individual
An individual living in Michigan prepares a paper Form 1040 claiming a $1,200 refund. Because the return does not include an enclosed check, the taxpayer consults page two of Publication 4038.
The map indicates that individual filers in Michigan are assigned to the Kansas City, Missouri processing center. The taxpayer addresses the envelope to the Kansas City campus, ensuring the return arrives directly at the center equipped to handle individual paper returns for the Great Lakes region.
Scenario 2: An S-Corporation Filing Form 1120-S Without Payment
A small software development business in California operates as an S-corporation. At tax time, the company prepares paper Form 1120-S to report its annual income and distribute Schedule K-1s to its owners. Because S-corporations are pass-through entities and do not pay corporate income taxes directly, no payment is enclosed.
The company accountant checks page one of Publication 4038. The Business Migration Map shows that California business filings without payment are routed to Ogden, Utah. The package is mailed directly to the Ogden campus, avoiding any routing confusion.
Scenario 3: Avoiding a Misdirected Payroll Tax Check
A retail store owner in Georgia prepares a quarterly Form 941 payroll tax return and encloses a paper check for $4,500. The owner looks at Publication 4038 and sees that Georgia businesses route to Kansas City.
However, the owner notices the bold instructional note stating that the map only applies to returns filed without payment. Instead of mailing the check to the Kansas City campus, the owner consults Publication 3891, finding the dedicated lockbox depository address in Charlotte, North Carolina. The check is deposited within 24 hours, preventing late-deposit penalties.
How This Publication Relates to Specific Forms
Publication 4038 provides the mailing destination roadmap for a wide variety of standard paper tax returns:
- Form 1040 and Form 1040-SR (U.S. Individual Income Tax Return): Governed by the Individual Migration Map on page two when filed without an enclosed payment.
- Form 1120 and Form 1120-S (Corporate Income Tax Returns): Governed by the Business Migration Map on page one when no tax balance is enclosed.
- Form 1065 (U.S. Return of Partnership Income): Information return for partnerships, routed to Ogden or Kansas City as displayed on the business map.
- Form 941 (Employer’s Quarterly Federal Tax Return): Primary quarterly employment tax return, routed according to the business map when no payment voucher is enclosed.
- Form 940 (Employer’s Annual Federal Unemployment Tax Return): Annual payroll return routed via the business processing network.
- Publication 3891 (Lockbox Address Directory): The vital companion publication that provides addresses for returns filed with payments.
Common Misunderstandings Clarified
Because postal routing for federal tax forms can be complex, several common misunderstandings often cause delays for filers:
- Misconception 1: Publication 4038 shows where to send tax payments. The migration maps in Publication 4038 are strictly for returns filed without payments. If you enclose a check or money order, you must use the lockbox addresses in Publication 3891.
- Misconception 2: You can drop paper returns at any local IRS office. Local IRS Taxpayer Assistance Centers do not process paper tax returns. Mailing returns to local field offices will result in forms being forwarded to a processing campus, creating significant delays.
- Misconception 3: If you moved during the year, you use your old state’s campus. You must always determine your filing destination based on your current legal residence or business mailing address at the time the return is mailed.
- Misconception 4: The migration maps apply to electronically filed returns. E-filed returns are transmitted directly into secure centralized IRS servers. Publication 4038 is exclusively used for physical paper envelopes shipped through the mail.
Why This Publication Matters for Taxpayers
Publication 4038 is vital because mailing a paper return to the wrong IRS campus can add weeks or months to your processing time. When an active campus receives misdirected mail, it must manually sort, repackage, and forward the documents to the proper center. During peak filing season, this extra transit time can delay critical refund payments needed for household expenses.
Furthermore, under the federal “timely mailed, timely filed” rule, your return is considered filed on time only if it is properly addressed and postmarked by the due date. Sending your return to a decommissioned IRS service center could jeopardize proof of timely filing if mail is returned. Checking Publication 4038 ensures that your return arrives at an active, authorized intake campus on time.
Frequently Asked Questions
What is the primary purpose of IRS Publication 4038?
Publication 4038 provides visual, color-coded maps showing which IRS processing campuses handle business and individual paper tax returns filed without payments for each state.
Why are these maps called “migration” maps?
They are called migration maps because they document the planned, multi-year transition of paper return processing from ten historical service centers into three consolidated mega-campuses: Austin, Kansas City, and Ogden.
Where do I send my return if I owe money and enclose a check?
If you enclose a payment, do not use the campus addresses from Publication 4038. You must refer to Publication 3891 to find the designated commercial lockbox address for your state.
What happens if I accidentally mail my return to a closed IRS service center?
If mailed to a closed center like Fresno or Brookhaven, the postal service or IRS forwarding staff will attempt to reroute the envelope to an active campus, but this transfer can add significant delays to your refund.
Which IRS campuses currently process paper tax returns?
Paper returns are primarily processed at three major IRS submission processing campuses: Austin, Texas; Kansas City, Missouri; and Ogden, Utah.
Do the migration maps change every tax year?
The IRS updates Publication 4038 periodically as facility workloads shift and consolidation phases are completed. Filers should always check the latest revision before mailing paper forms.
Conclusion – Key Takeaways Summarized
IRS Publication 4038, “Business Tax Return Processing Migration Map / Individual Tax Return Processing Migration Map,” is an indispensable guide for anyone submitting physical paper tax forms. By illustrating the regional boundaries for active submission processing campuses in Austin, Kansas City, and Ogden, it ensures your paperwork arrives at the right destination.
Remember that Publication 4038 is designed specifically for returns filed without an enclosed payment; payment-bearing returns must always be routed to the lockbox network in Publication 3891. Taking a moment to verify your state’s assigned processing center on the migration map protects you against unnecessary postal delays, helps ensure timely filing, and keeps your tax affairs running smoothly.
