TC 489: Installment Agreement Defaulted

What the code actually does

TC 489 updates a module (the IRS’s record for one tax period within the account) to collection status 21 when an installment agreement defaults — most commonly a missed or late payment. Doc 6209 §8A (the IRS’s own internal Master File Codes reference, a free public PDF on IRS.gov) titles the code itself "Installment Defaulted" and states that on posting it "[u]pdates module status to ‘21’, delete[s] any deferred action to issue CP 191 and go[es] through TDA/BAL DUE analysis" — meaning the module re-enters the standard delinquent-account review that TC 488 (status 14) had suspended.

Some transcript references describe status 21 as an agreement the IRS is still processing or reviewing before it settles into status 14. Doc 6209 does not support that reading — TC 489 is a default code, and it presupposes a TC 488 already existed. Treat any transcript showing TC 489 as evidence the agreement broke down, not evidence the IRS is still working one out.

Why a client sees this after TC 488, not before it

A transcript moving from TC 488 to TC 489 means the account was in a settled payment posture and fell out of it — the module re-enters TDA/BAL DUE (delinquent-account) processing exactly as if the agreement had never existed, with the CP 191 deferred action Doc 6209 references removed from the pipeline. It is not itself a final termination of the agreement, but it is the system’s own record that the taxpayer is no longer honoring the agreement as of that date.

The client should hear this as urgent, not routine: status 21 sitting on a transcript means active collection has effectively resumed, and the earlier the practitioner addresses it, the more options remain before the IRS moves to formally terminate the agreement and restart the standard notice and levy sequence.

The statute rule is unchanged

The same rule that governs TC 488 applies here: an installment agreement, in force or defaulted, does not suspend the CSED (the Collection Statute Expiration Date — the deadline by which the IRS must collect an already-assessed balance). IRM 5.1.19.3.5(6) states plainly that "[t]he CSED is not suspended while an installment agreement is in effect," and a default does not create any suspension of its own — the clock keeps running through the default exactly as it did through the agreement itself. The only CSED suspension in this whole sequence is the narrower one described on the TC 488 page: 30 days following an actual termination, plus any Appeals-consideration period, once the IRS acts on the default.

The practitioner’s actual next step

Identify what caused the default before advising the client — a missed payment, a bounced payment, a new filing requirement the agreement didn’t anticipate, or an income change. Pull the account transcript forward from the TC 489 date to see what happened and whether the IRS has taken any further action since.

Confirm whether the IRS has proposed or completed a formal termination. A TC 489 default alone is not the same as termination, but the Collection Appeal Program rights described on the TC 488 page — a real right belonging to the taxpayer, filed on Form 9423 within 30 days, no prior managerial conference required — apply once the IRS moves to terminate, not merely once the default posts. Track that distinction so the client doesn’t miss the actual appeal deadline.

Continue tracking the CSED using The Federal Tax Desk’s CSED Calculator — a default under TC 489 has not paused the clock, and the calculation should proceed exactly as if no agreement had ever existed, absent the narrower 30-day post-termination window.

If the underlying hardship that caused the default is genuine and ongoing, evaluate whether a fresh agreement — potentially on different terms — is realistic, rather than assuming the original terms simply need reinstating.

What TC 489 gets confused with

TC 489 and TC 488 are the pair most likely to be conflated, since both relate to the same installment-agreement lifecycle and can appear close together on the same transcript. The distinction that matters: TC 488 (status 14) reflects the agreement in force; TC 489 (status 21) reflects that agreement defaulting and the module returning to standard delinquent-account processing. A client asking "is my payment plan still active" needs the practitioner to know which of these two codes is the more recent one on the transcript — and if it’s TC 489, the honest answer is no, not currently.

TC 489 is also worth distinguishing from TC 530 (Currently Not Collectible), even though both can precede renewed collection contact. TC 530 reflects a hardship determination the IRS made independent of any agreement. TC 489 reflects a specific agreement failing on its own terms — a materially different history to explain to a client, since one implies the IRS assessed inability to pay at all, and the other implies a payment plan simply broke down.