TC 483: Correction of an Erroneous or Not-Processable TC 480

What the code actually does

IRS Document 6209, Section 8A (the IRS’s reference guide to its data-processing codes) titles TC 483 "Correction of Erroneous Posting of TC 480, Returned (Not Processable)" and describes it as recording "that TC 480 OIC was posted in error, or returned because OIC was not Processable." ("OIC" is an Offer in Compromise, the taxpayer's offer to settle a tax debt for less than the full amount owed.)

Those are two distinct events sharing one code. The first is a data-entry correction — someone input a TC 480 that should never have posted at all, on a module (the record for one tax type and period) with no actual offer behind it. The second is a substantive outcome — the taxpayer submitted a real offer, and the IRS found it not processable and returned it, so no one ever worked it. Either way the effect on the module is the same: the TC 480 pending-offer status comes off.

It does not extend the statute — read that against TC 480 itself

A TC 483 does not extend either statute. Doc 6209 states it directly: TC 483 "does not extend Assessment and Collection Statute Expiration Dates, reverts to normal date." IRM 5.19.7.2.6 makes the same point from the IRS employee's side, as a reminder attached to its own CSED-suspension rule: "input of TC 480 and a subsequent TC 483... does not suspend the CSED, as this was an erroneous input of TC 480. The CSED reverts back to the original CSED."

The reason this needs saying is that a pending offer normally does suspend the collection statute — TC 480 itself runs the clock stop practitioners expect. TC 483 is the one outcome in the whole OIC-code family that does not, because the IRM treats the original 480 as never having validly existed. A practitioner who sees a 480/483 pair and assumes the usual suspension applied, the way it would with a rejection under TC 481 or a withdrawal under TC 482, will overstate how much collection time is actually left.

Transcripts keep coming, then stop

Doc 6209 adds a smaller but useful operational detail: TC 483 "generates OIC Transcript but discontinues further OIC transcripts." One more OIC transcript cycle fires at the correction itself, and then the transcript stream that had been running since the erroneous TC 480 simply ends. A practitioner monitoring a case by transcript activity should expect that one final notice, not an abrupt silence with no closing record at all.

What people mistake TC 483 for

People confuse it with the two real reversals. TC 481 and TC 482 both end a genuinely pending, processable offer — one by rejection, one by withdrawal or termination — and both carry the CSED suspension Doc 6209 attaches to a valid TC 480. TC 483 looks similar on a transcript, closing out the same pending status, but it is telling a different story: the offer this code closes was never validly pending in the first place.

It is also easy to read as proof nothing happened at all. That is not quite right either. IRM 5.19.7.2.6 and IRM 5.8.10.8 both treat the erroneous-input and not-processable scenarios as real events worth documenting on the module, even though neither changes the statute — the correction itself, and the reason for it, belong in the file.

What to do next

Confirm which of the two TC 483 scenarios applies — erroneous input, or a return for lack of processability — since the client-facing explanation differs even though the code and its statute effect do not.

Recalculate the CSED from the original assessment date, ignoring the 480/483 pair entirely, rather than treating the offer period as suspended time.

Do not confuse this reversal with TC 481 or TC 482 when explaining statute consequences to a client — only those two carry the suspension this code deliberately does not.

Expect one final OIC transcript at the correction and treat its absence afterward as normal, not as a sign the case is still open.

Where a client believes an offer was submitted and worked, and the module shows only a TC 480/483 pair, treat that as evidence the offer was never actually processable and revisit eligibility before resubmitting.