A debt collector just contacted you about a debt you don’t recognize, an amount that looks wrong, or an account so old you can’t check it. Federal law gives you one precise tool for this moment: a written dispute under the Fair Debt Collection Practices Act. Send it correctly and in time, and the collector must stop collecting until it mails you verification. Send the lazy one-line version — or a credit-repair template full of fake demands — and you may have burned the only dispute the rules require them to fully answer. Here is exactly how the statute works, with the citations.

Your validation rights at a glance

The 30-day window You have 30 days after receiving the collector’s validation notice to dispute in writing. Receipt is assumed 5 business days after the notice is provided (12 CFR § 1006.34(b)(5)) — the calculator below does this math for you.
What a written dispute triggers Collection of the debt — or any disputed portion — must cease until verification of the debt or a copy of a judgment is mailed to you (15 U.S.C. § 1692g(b); 12 CFR § 1006.38(d)(2)).
The original-creditor request A written request for the original creditor’s name and address carries the same cease-collection duty until it’s provided (§ 1692g(b); 12 CFR § 1006.38(c)).
What ignoring you costs them FDCPA violations expose a collector to your actual damages, additional damages up to $1,000 as a court may allow, plus costs and attorney’s fees (15 U.S.C. § 1692k) — the fee-shift is why consumer lawyers take these cases.

Validation letter vs. verification letter: same letter, two names

People search for both. The statute uses both. Section 1692g’s heading says “Validation of debts” while the operative text requires the collector to obtain and mail “verification of the debt.” There is no separate “debt verification letter” with different rules — a written dispute under § 1692g(b) is the instrument either way. What matters is not the name on the letter but whether it does three jobs at once, in writing, inside the window.

Why your first letter is the one that counts

This is the part almost every free template misses. Regulation F has a duplicative-dispute rule: if you send a second dispute that is “substantially the same” as your first and doesn’t add “new and material information,” the collector can simply refer you back to its earlier response instead of answering again (12 CFR § 1006.38(a)(1), (d)(2)(ii)). Fire off a one-line “I dispute this” note today, and your detailed follow-up next month may be legally brushed off as a duplicate.

The professional move is one comprehensive letter that does everything: disputes the debt, requests the original creditor’s name and address, and demands the full itemization the regulation requires — the itemization date, the amount on that date, and an itemized accounting of every interest charge, fee, payment, and credit since (12 CFR § 1006.34(c)(2)(vi)–(ix)). That itemization demand is where mismatched amounts, junk fees, and double-counted interest get exposed.

The myths that get validation letters ignored

Myth 1: “If they don’t respond in 30 days, they must delete the debt.” The statute contains no response deadline for the collector and no deletion trigger. What § 1692g(b) actually says is that collection must stop until verification is mailed — an open-ended pause, not a 30-day forfeit. Letters built on the fake deadline tell the collector you don’t know the law.

Myth 2: “Demand the original signed contract — without it the debt is invalid.” Section 1692g requires “verification of the debt.” It does not name any specific document, and demanding a “wet-ink signature” as a statutory entitlement is credit-repair fiction. Documentation of the debt’s ownership matters enormously in a different arena — see our honest guide to chain of custody and debt validation — but framing it as a § 1692g requirement invites the collector to ignore you.

Myth 3: “Their silence waives the debt.” No waiver language in any consumer letter has that power, and the inverse is also true in your favor: your failure to dispute is not an admission you owe anything (§ 1692g(c); 12 CFR § 1006.38(d)(1)).

Compute your deadline, then see the letter

Enter the date printed on the collector’s notice. Under 12 CFR § 1006.34(b)(5), you’re assumed to receive it 5 business days later, and your written-dispute window runs 30 days from receipt. Then watch the letter rewrite itself with your numbers.

Free: see this letter with your numbers

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Debt Validation & Dispute Letter — Preview
[Your Name] [Your Address] [City, ST ZIP] [Date] [Collector Name] [Collector Address] SENT BY CERTIFIED MAIL — RETURN RECEIPT REQUESTED RE: Written Dispute and Demand for Verification — 15 U.S.C. § 1692g(b) — Alleged account ending [LAST 4] To Whom It May Concern: This letter is not a request. It is formal written notice that the debt you allege I owe in the amount of $[AMOUNT] is disputed in its entirety, and it is my written demand under 15 U.S.C. § 1692g(b) that you cease collection of this debt until the verification required by law is mailed to me. This dispute is timely. Your notice is dated [NOTICE DATE]. Under 12 CFR § 1006.34(b)(5), the validation period runs through at least [DISPUTE DEADLINE], and this letter is delivered within it. Pursuant to 15 U.S.C. § 1692g(b) and 12 CFR § 1006.38, I demand that you provide, in writing: (1) verification of the debt or a copy of a judgment; (2) the name and address of the original creditor; and (3) the itemization required by 12 CFR § 1006.34(c)(2)(vi)–(ix) — the itemization date you are using, the amount of the debt on that date, and an itemized accounting of each interest charge, fee, payment, and credit applied since...

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After you mail it

Send it certified mail, return receipt requested, and keep the green card — the mailing proof is what makes the cease-collection duty enforceable. If collection activity continues before verification arrives, every call and letter is evidence; file a complaint with the CFPB and your state attorney general, and know that § 1692k’s fee-shifting means consumer attorneys frequently take solid FDCPA cases at no cost to you. If what you actually want is for the calls to stop regardless of the debt’s validity, that is a different tool — a cease-and-desist letter under § 1692c(c) — and it controls the channel without resolving the debt.

The rest of the toolkit

Need the letter itself, fast? Start with the statute-grounded validation letter template. Negotiating an old collection account? Read the honest guide to pay-for-delete letters before you offer a dime. And if a debt buyer is involved, understand what they can and cannot prove — it changes your leverage entirely.

This guide is general information about federal consumer-protection law, not legal advice. Statutes and regulations are paraphrased; verify current law for your situation. For significant or contested debts, consult a licensed consumer attorney in your state.

Dealing with a specific agency? See our company-by-company response guides: Midland Credit Management, Portfolio Recovery Associates, LVNV Funding, Jefferson Capital, Transworld Systems, National Credit Systems, IC System, and 30 more in the collection agency index.

How long can they sue? Every state caps it. See our debt statute of limitations by state guide — all 50 states, verified against the statutes, including which states bar revival entirely.