The California numbers, and where they come from
The controlling law is Cal. Code Civ. Proc. §§ 337, 339; § 337(d). The periods that matter:
- Written contracts: 4 years.
- Oral and implied contracts: 2 years.
- Credit cards and similar accounts: 4 years — written contracts and book/open accounts both run 4 (CCP § 337).
The clock generally runs from default — usually your last payment or first missed one — which is why the dated account history matters more than anything a collector says on the phone. A validation demand under 15 U.S.C. § 1692g makes them produce it: a written dispute within 30 days of the validation notice requires the collector to cease collection until verification is mailed.
Two regimes — timing and ownership decide — California's revival rules
Timing is everything in California: a payment made BEFORE the 4 years run can restart the clock (§ 360), but once the period has expired, a payment does NOT revive the debt — the suit bar holds.
This is why the safest contact with a collector on an old debt is a written dispute that concedes nothing: it engages every federal protection while handing the collector none of the acts that restart a limitations period.
The California catch worth knowing
CCP § 337(d) (2019) is an outright prohibition: once the period runs, a person “shall not bring suit or initiate an arbitration or other legal proceeding to collect the debt.” Not a defense you must raise — a bar on filing at all. The Fair Debt Buying Practices Act layers on chain-of-documentation duties for debt buyers.
A letter that puts the dates on the record converts § 337(d) from an affirmative defense into a filing deterrent — and flags the FDBPA documentation the buyer must already possess before suing.
If they sue anyway
A time-barred lawsuit doesn’t dismiss itself: the limitations defense must be raised, which means answering the complaint instead of defaulting. Your dated demand letter becomes evidence twice over — it fixes the dispute date, and it shows the court the collector proceeded after formal notice of the limitations problem. Bring the letter, the proof of mailing, and every account record they did (or didn’t) produce.
For the validation mechanics themselves — what collectors must send, and the documentation a debt buyer should be made to produce — see our debt validation letter guide and the assignment-documentation playbook.
Is a specific collector on the account?
Who is collecting changes how you respond. We keep company-by-company guides — verified dispute addresses, what each company collects, and the validation letter for each — for Midland Credit Management, LVNV Funding, Portfolio Recovery Associates, and 34 more in the collection agency index. Whoever it is, the sequence is the same: written validation demand first, before any payment or acknowledgment.
Run your deadline, see the letter
The preview locks here. The complete letter runs your dates against California’s limitations rules, sequences the § 1692g demands correctly, and asserts the time-bar notice without a single word that restarts the clock — in 60 seconds.
Generate My California Debt Letter — $9Need more? Bundle of 3 — $19 · Family Pack — $39
This page is general information, 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.