Do invoices expire or have a legal expiration date?
Do invoices expire? What you need to know about invoice age and legal enforceability
Short answer
Invoices do not expire automatically, but your right to enforce them in court expires when the statute of limitations runs out — typically 3–6 years from the date payment was due, depending on your state and whether the agreement was oral or written. An invoice that is 5 years old is still technically owed; you just may no longer be able to sue to collect it. The clock usually starts from the original due date, not the invoice issue date, and can be reset or 'tolled' by a partial payment or written acknowledgment of the debt.
An invoice is a demand for payment. It does not expire the way a coupon or offer expires — there is no date after which the debt disappears. What does expire is your legal remedy: the right to file a lawsuit to enforce the debt. That expiration is governed by the statute of limitations for contract claims in your state.
The most common statute of limitations windows in the US: written contracts (including most service agreements) run 4–6 years in the majority of states, though some states allow as few as 3 years and others as many as 10 years. Oral-only agreements typically get shorter limitations periods — 2–4 years in most states. The clock generally starts from the date the debt was due (the invoice due date), not the date the invoice was issued. If your invoice was due January 1 and you have a 4-year limitation, you must file suit by approximately December 31 four years later.
Two important modifications: partial payment and written acknowledgment. If the customer makes any payment — even $1 — after the original due date, the statute of limitations clock typically resets from the date of that payment. Similarly, a written acknowledgment by the debtor that the debt exists (including some email threads) can reset or toll the clock in many states. This is why staying in contact about overdue invoices matters beyond the immediate recovery goal — it preserves your legal options.
What happens to a debt after the statute runs? The debt still exists in a moral sense. The customer still owes it. But you lose the right to sue. You can still send invoices, ask for payment, and accept it if offered — you just cannot compel it through the courts. Some businesses continue sending invoices on very old accounts and occasionally receive payment; the customer may not realize the statute has run.
Practically: if an invoice is approaching the 2-year mark without resolution, assess your options before the statute gets close. A demand letter sent in year 2 is more useful than one in year 4. Filing a small claims case while you still can — even a simple one — is often worth it on invoices above $2,000. The cost is a filing fee and an afternoon; the alternative is writing off a recoverable balance because you ran out the clock.