The federal prohibition is real, and it is narrower than "they cannot come after you." Regulation F states it in one sentence at 12 CFR 1006.26(b): "A debt collector must not bring or threaten to bring a legal action against a consumer to collect a time-barred debt." Three features of that sentence decide how much it is worth.
It has no knowledge qualifier. The Bureau's rule does not ask whether the collector realized the debt was time-barred, so a mistaken belief about the date is not a defense to the prohibition. It reaches debt collectors, which is a defined term, so it does not by itself bind an original creditor collecting its own account in its own name. And it prohibits suing and threatening to sue, not asking. Letters and telephone calls about a time-barred debt are not what this paragraph addresses, which is precisely why so many people conclude the rule does not exist. The paragraph also excludes proofs of claim filed in a bankruptcy proceeding.
It is an affirmative defense, and that is the sentence that decides real outcomes. Expiry does not make a court refuse the case on its own initiative. The defendant has to raise it. A consumer who is served with a summons on an old debt and does not appear can have judgment entered against them however clearly the period had run, and a judgment is a new and much more durable object with its own enforcement tools. The Credit and Debt guide makes the same point at greater length, and it is the one thing on this page worth acting on immediately: a summons on an old debt is not safe to ignore, and it is the moment at which the defense either gets used or is lost.
Revival is the trap, and its shape is worth understanding rather than memorizing. In many states a partial payment on a time-barred debt, or a written acknowledgment that it is owed, may restart the limitation period from that date. The rules are state law and they are not uniform, so "may" is the correct word and no state's rule should be assumed from another's. The practical consequence is disproportionate: a modest good-faith payment can convert an unenforceable balance back into a suable one, and the collector making the offer often has more reason to know that than the consumer accepting it. Establishing how old a debt is therefore comes before paying anything on it.
Two clocks, and confusing them is the most common error in this area. The limitation period governs whether a creditor may sue. A separate period, set by the Fair Credit Reporting Act, governs how long an item may appear on a credit report. They start at different times, run for different lengths, and expire independently. An old debt can be past the limitation period and still on a credit report, or off the report and still within the period. The credit report page carries the reporting side, including the rule that fixes the start of the seven-year clock for a collection or a charge-off.
The tax consequence is counter-intuitive. It would be reasonable to assume that when the limitation period runs out, the debt is effectively cancelled and a Form 1099-C follows. Under 26 CFR 1.6050P-1(b)(2)(i)(C) the expiration of the limitation period is indeed one of the seven identifiable events that trigger reporting, but paragraph (b)(2)(ii) attaches a condition that almost never occurs: an identifiable event happens on that ground "only if, and at such time as, a debtor's affirmative statute of limitations defense is upheld in a final judgment or decision of a judicial proceeding, and the period for appealing the judgment or decision has expired."
So the clock running out does not by itself cancel the debt or produce a tax form. It takes a lawsuit, a defense actually raised, a ruling in the consumer's favor, and an expired appeal window. That is the same lesson as the charge-off page's, approached from the other end: the events that feel like forgiveness are usually not the events the tax rules recognize.
One note on sources, because the ground shifted in 2025 without the rule changing. The Bureau withdrew a large body of guidance on May 12, 2025 at 90 FR 20084, and the withdrawn material included its advisory opinion on time-barred debt. Nothing in Regulation F was amended, so 12 CFR 1006.26 is codified and in force and says what it says. Cite the regulation rather than the withdrawn guidance.