B2B Unpaid Invoice Disputes Between Businesses
When one business owes another money, small claims court works similarly to a standard unpaid invoice case — with a few extra considerations specific to business-to-business relationships.
Confirm the correct legal defendant
Just as in our guide on suing a business, the first step is confirming the exact legal name of the business you're owed money by — check your invoices, contracts, or your state's business registry to make sure you're naming the correct legal entity, not just a trade name or "the company we worked with."
Evidence that matters most
- The contract, purchase order, or service agreement outlining the scope and payment terms
- Invoices, dated and itemized, showing what was billed and when
- Proof of delivery or service completion — signed acceptance, delivery confirmation, or a project completion sign-off
- Payment history, showing any partial payments made (which can indicate acknowledgment of the debt)
- Communication trail — emails confirming the order, any approval of the work or goods, and follow-ups about payment
Check your contract's payment terms closely
B2B agreements often include specific provisions worth reviewing:
- Net payment terms (Net 30, Net 60, etc.) — confirming exactly when payment was actually due
- Late payment interest or fees — many B2B contracts specify a rate for overdue invoices, which you can include in your claim if applicable
- Dispute resolution clauses — some B2B contracts require arbitration or mediation before litigation; check for a small claims carve-out similar to consumer contracts
What if the other business disputes the quality of goods or services?
Similar to freelance work disputes, this is common — the business claims what was delivered didn't meet expectations. Focus your case on:
- What was specifically agreed to in the contract or purchase order
- Any approval or acceptance you received along the way
- Whether you completed any agreed revision or correction process, if applicable
Corporate structure considerations
If you're suing an LLC or corporation, remember that these entities are generally treated as separate from their owners — meaning your claim is against the business itself, not personally against an owner or manager, unless there's a specific reason to pierce that separation (a more complex legal question beyond typical small claims scope).
Calculating your claim
- The invoiced amount owed
- Any contractually specified late fees or interest
- Your filing and service costs, if your state allows recovering these upon winning
Before filing
A firm, professional demand letter referencing the specific invoice, contract terms, and a clear payment deadline is standard practice in B2B disputes and often resolves matters before litigation becomes necessary — many businesses prefer to avoid the time and reputational cost of a public dispute.
This article is for general informational purposes and isn't legal advice. B2B contract enforceability and dispute resolution requirements vary by state and contract terms — review your specific agreement before filing.