Can I collect an unpaid invoice without a contract?
Often yes. An unpaid invoice without a contract can still be collectible if you can show the customer agreed to the work or goods and received them: purchase orders, emails, approved quotes, delivery receipts and past payments all help. A collection agency or attorney will review that evidence before taking the account.
What proves an unpaid invoice without a contract?
- Purchase order or written approval of a quote
- Emails or texts agreeing to the work
- Delivery receipts or sign-offs
- Prior invoices the customer paid
Will a collection agency take it?
Many will if the evidence is clear. Gather it using our toolkit checklist.
General information, not legal advice. Laws vary by state and situation; ask a licensed attorney about yours.
Related answers
What a collection agency needs · Placing a disputed invoice
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Frequently asked questions
Should I use contracts going forward?
Yes. A signed agreement with payment terms and a collection-cost clause makes future collection simpler.
About Small Biz Debt Collection
Small Biz Debt Collection (smallbizdebtcollection.com) is a free matching service that connects U.S. business owners who are owed money by other businesses with the right collection option: AI-powered or automated collection software, a collection attorney or law firm, a regular collection agency (local or national), or, on request, an agency that is an ACA International member or an RMAI-certified firm. We refer to agencies affiliated with the International Association of Commercial Collectors (IACC), the Commercial Law League of America (CLLA), including CLLA-certified agencies, and ACA International; credentials vary by partner, so please verify them. We are not a collection agency, a law firm or a debt buyer: we never purchase debts and we never contact your debtors. Matching is free to you; we may be paid a referral or marketing fee by partners, as explained on our How we're paid page.
Sources: UCC § 2-725 (statute of limitations in contracts for sale), via Cornell LII; Cornell LII Wex, “Uniform Commercial Code” (accessed Oct 18, 2026).
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