A Complete Guide to Fixing IRS Unpostable Errors Before They Become Months-Long Delays

Most taxpayers are familiar with refund codes, processing codes, and even identity-verification codes. But one of the rarest—and most confusing—issues is an “unpostable” return. This happens when the IRS receives your return but cannot assign it to your account due to a technical or data-matching error.

On your transcript, this shows up as:

• TC 998 – Unpostable Condition
• TC 999 – Reject Unpostable Transaction

If these codes appear, your return is stuck in limbo. It is not processed, not rejected, and not moving forward. The good news is that unpostables can be fixed—but only if you take quick action.

This guide breaks down exactly what an unpostable return is, why it happens, and how to re-file fast to avoid long refund delays.

What Is an Unpostable Return?

An unpostable return is a tax return the IRS system receives but cannot assign to your account because something in the return does not match IRS master file rules.

Instead of posting normally with:

• TC 150 (Return Filed)
• TC 806 (Withholding)
• TC 570 or 846

The return hits a system error and is placed into an “unpostable” queue for manual review.

In simple terms:

The IRS received your return, but it could not be processed.

Nothing moves forward until the error is corrected.

What Codes 998 and 999 Mean on Your Transcript

These are the primary codes associated with unpostable returns:

TC 998 — Unpostable Condition

This means the IRS attempted to post your return, but the system rejected it internally.

TC 999 — Reject Unpostable Transaction

The return was officially rejected from the system and removed from the processing pipeline.

Together, these codes confirm your return must be corrected or refiled.

Why Returns Become Unpostable (Most Common Causes)

Although rare, unpostable returns happen for very specific reasons. The most common include:

1. Mismatch Between IRS Records and Taxpayer Information

• Name does not match SSA records
• SSN is incorrect or belongs to a deceased taxpayer
• Filing status conflicts with IRS master file data
• Address formatting issues causing a system rejection

2. Duplicate Return Data

• IRS already has a return for the year
• A prior amended return conflicts with current data
• A spouse’s SSN appears on another MFJ return

3. Corrupted e-file or software formatting issues

• Damaged or incomplete electronic file
• Transmitted software errors
• Rejected XML or schema formatting

4. Identity Theft Conflicts

• IRS flags your SSN as compromised
• Prior fraud indicators cause system rejection

5. IRS System Glitches

• Master File downtime
• Multi-year data inconsistencies
• Return posts before an account update is completed

You cannot predict or prevent an unpostable return—but you can fix it quickly once identified.

How You Will Know Your Return Is Unpostable

Most taxpayers only learn their return is unpostable through one of these signs:

1. The IRS sends a letter

Often titled “Your return could not be posted,” or a notice requesting corrections.

2. Your transcript shows TC 998 or TC 999

This is the most reliable indicator.

3. Your refund never moves past Accepted

If you see no movement for weeks and no transcript activity, this is a red flag.

4. Your return appears to disappear from processing

No codes, no updates, no TC 150—nothing.

When in doubt, checking your transcript is the fastest way to confirm.

How to Fix an Unpostable Return Fast (Step-by-Step)

To avoid a months-long delay, you must correct the issue quickly. Here is how:

Step 1: Wait for the IRS Notice (Only if One Is Already on the Way)

If the IRS has already mailed a notice, it will explain:

• What caused the unpostable
• What documents or corrections are needed
• Where to send the revised return

If you already know the cause from your transcript, you do not need to wait.

Step 2: Correct the Underlying Issue

Depending on the cause, this may include:

• Fixing an incorrect SSN
• Correcting a name mismatch with SSA
• Re-entering W-2 information
• Updating address formatting
• Correcting e-file forms
• Re-submitting the return with complete schedules

If the return included data that conflicts with IRS records, you must resolve the mismatch before re-filing.

Step 3: Re-File the Return (Electronic if Possible)

The fastest fix is to re-file electronically once the correction is made.

Only paper file if:

• The IRS specifically requires it
• Your e-file is blocked due to duplicate return issues
• Your account is locked due to identity theft

Paper returns add 6–12 weeks to the timeline, so avoid them unless required.

Step 4: Monitor Your Transcript for TC 150

After re-filing, watch for:

• TC 150 – Return Filed
• TC 806 – Withholding
• Additional credits (766/768)
• Final TC 846 – Refund Issued

Once TC 150 posts, your return is officially back in the processing system.

How Long Will an Unpostable Cause a Refund Delay?

This depends entirely on how quickly you correct the issue.

Fast correction (within days)

Refund delay: 2–4 weeks

Slow correction (waiting for letters or paperwork)

Refund delay: 6–12 weeks

No correction—return remains unpostable

Refund delay: indefinite
The return literally cannot be processed.

Unpostable returns will never result in an automatic refund.
You must take action to resolve them.

When to Contact the IRS or Taxpayer Advocate Service

You should call the IRS if:

• TC 998/999 has been on your transcript for more than 21 days
• No letter has arrived within 2–3 weeks
• You need clarification about the error
• You are unable to re-file electronically

Contact the Taxpayer Advocate Service if:

• Your refund delay is causing financial hardship
• IRS phone support cannot resolve the issue
• The unpostable has been unresolved for 8+ weeks

TAS cannot override system errors but can escalate stuck cases.

An unpostable return is rare but serious. It means the IRS received your return but could not place it on your account, which freezes your refund until the issue is corrected.

To resolve it fast:

1. Identify the unpostable (Codes 998/999)
2. Correct the mismatch or error
3. Re-file electronically when possible
4. Monitor your transcript for TC 150
5. Contact the IRS or TAS if delays persist

The sooner you fix the issue, the faster your refund will get back on track.