insights
Best B2B debt purchase companies for unpaid invoices
- Debt purchase means selling an invoice outright for a discounted lump sum, so you transfer ownership and take pennies on the dollar. Collection means keeping ownership and paying a contingency fee only on what gets recovered. This list covers both so you can pick correctly.
TL;DR
- Debt purchase means selling an invoice outright for a discounted lump sum, so you transfer ownership and take pennies on the dollar. Collection means keeping ownership and paying a contingency fee only on what gets recovered. This list covers both so you can pick correctly.
- Delos (top pick) automates the full litigation process, not just outreach, which makes small claims and lien matters profitable to pursue instead of writing them off.
- Traditional bulk portfolio buyers are the closest literal match to "who buys unpaid invoices," though they underwrite hard and pay little.
- AgentCollect and SW Recovery collect on your behalf for a fee while you retain ownership.
- HighRadius and AR automation platforms fit accounts still inside a normal payment relationship, before escalation.
Debt purchase vs. debt collection: which one your unpaid invoices need
Selling an invoice and hiring a collector are two different transactions, and choosing the wrong one wastes money. When you sell a receivable, you transfer ownership outright to a debt buyer for a discounted lump sum, and that buyer keeps whatever it recovers. When you hire a collection agency, you keep ownership and pay the agency a percentage of what it recovers on your behalf. The search term "who buys unpaid invoices" points at the first model. The term "best B2B debt collection companies" points at the second.
The timing of a sale explains why the discount is so steep. Original creditors typically declare a debt charged off after roughly six months of nonpayment, at which point the account becomes a tax-deductible loss and gets bundled into a portfolio. Those portfolios sell to independent debt-buying companies "for pennies on the dollar," as EBSCO's research describes the mechanism. You get cash now and certainty, but you surrender most of the invoice's face value and any future recovery.
Both paths share a natural trigger point. According to NSBI, once an invoice passes 90 days past due or your internal reminders and calls have stalled, engaging a third party becomes the necessary next step. That moment is where this list starts. The ranked options below cover selling, collecting, and litigating, so you can match the right mechanism to the invoice in front of you rather than defaulting to whichever one a vendor sells.
How we ranked these B2B debt purchase and recovery options
We scored each option against six criteria that decide whether the money actually reaches your account. First, recourse versus non-recourse structure, which controls who eats the shortfall if the debtor pays less than expected. Second, transparency of pricing and the discount rate, since a buyer who won't quote a clear percentage is hiding the real cost. Third, industry fit, because a buyer fluent in freight receivables underwrites them faster than a generalist. Fourth, compliance posture, including certifications like SOC 2 that signal disciplined handling. Fifth, speed from portfolio review to funding. Sixth, whether small-dollar and lien-related claims are economically viable at all.
The sixth criterion reshuffles the whole ranking. Traditional bulk debt-purchase math ignores small claims and lien matters, because the fixed cost of underwriting and collecting swamps the recovery on a low-value invoice. A buyer who pays pennies on the dollar simply won't touch a claim that's too small or too legally complex. Litigation automation attacks that cost directly, which is why Delos ranks first below rather than a discount buyer.
Delos: litigation automation that makes small claims and liens worth pursuing
Delos ranks first because we automate the litigation process itself, not just the friendly first email. A discount buyer pays pennies on a $4,000 invoice and a contingency agency skips it entirely, since the recovery math never justifies the labor. By automating filing, small claims, and lien enforcement, we make those same claims profitable to pursue.
Delos fits businesses whose invoices are too small or too complex for a portfolio sale. Amicable outreach handles debtors who simply forgot. When they refuse, we carry the matter into court rather than writing it off.
For construction and supplier claims, Delos can both file a mechanic's lien and take the case through litigation in one platform, which general collection agencies do not do because they treat liens as outside their scope.
The tradeoff is time. An outright sale gives you cash today, while litigation returns more of the face value later.
Traditional B2B debt portfolio buyers (bulk discount purchase)
The traditional model is the closest literal match to "who buys unpaid invoices." A buyer purchases a portfolio of receivables outright, pays a discount against face value, and takes over collection rights entirely. You get cash now and walk away from the account.
Whether the deal is recourse or non-recourse, a framework borrowed from lending, drives both its pricing and its speed. Non-recourse buyers absorb the full risk if the debtor never pays, so they underwrite harder and pay less. In commercial real estate, non-recourse lenders "scrutinize the property's cash flow, tenant quality, and market stability much more intensely" and offer lower advances at higher cost (Essex Capital Markets). Recourse-style deals close faster and pay more, but leave you liable for shortfalls if the buyer cannot collect. In practice, non-recourse buyers are fewer and pickier, while recourse buyers are more common and push risk back onto you.
No named, vetted commercial bulk buyer earns a specific ranking here, because reliable independent data on non-consumer invoice purchasers is thin. Treat this as a category rather than a vendor pick. Before selling, confirm the buyer's licensing in your state, since many states do not require debt buyers to be licensed (EBSCO), and demand written terms on discount rate, recourse structure, and how disputes flow back to you.
AgentCollect and SW Recovery: contingency-based commercial collection
AgentCollect and SW Recovery sit in a different model from the debt buyers above. You keep ownership of the invoice, and the agency works it on contingency, taking a percentage of whatever it recovers. Nothing changes hands until money comes in, so you carry the risk of a total non-recovery, but you never sell the receivable at a discount. Businesses that still expect the debtor might pay, or that want to preserve the customer relationship, tend to prefer this path over an outright sale.
The catch with both firms is that independent, verifiable data on their pricing, recovery rates, and specialties is thin. Neither appears in the Gartner or peer-review datasets that cover the software vendors, so any claim about their performance comes from their own marketing. Treat vendor-asserted numbers as a starting point, not proof.
Vet either one on the same criteria you would apply to any contingency collector. Ask for a written fee schedule and confirm there are no hidden filing or placement charges, since firms that bury filing or placement fees erode the recovery you were promised. Confirm they have handled accounts in your industry and can name a track record, and check for SOC 2 Type II certification as a signal of their compliance and data-security posture. If a firm avoids clear answers on fees or specialization, treat that as a warning sign. For claims too small or too complex to interest a contingency agency, litigation automation is usually the better route.
HighRadius and AR automation platforms: for accounts that just need better dunning
HighRadius belongs on this list mainly to tell you when you don't need any of the other options yet. It automates accounts receivable for customers who are still inside a normal payment relationship, meaning customers who will pay once the right reminder reaches them. Gartner Peer Insights classifies it under Invoice-to-Cash Applications with a 4.6 average across 149 ratings, rated well by users on integration and deployment (Gartner). For invoicing, dunning sequences, cash application, and aging reports, it does the job well.
The tool stops working the moment a customer decides not to pay. A commercial collections analysis puts it directly: the automated message "repeats on schedule after the customer has stopped reading it," and there is "nothing to apply until the customer decides to send funds" (JSD). AR automation and debt purchase solve different problems, and treating dunning software as a substitute for escalation just delays the account past the point where recovery gets harder.
CRSoftware sits in the same bucket as an AR and credit-management platform, though independent review data on it is thin compared to HighRadius. Use either one to shorten your days-sales-outstanding and catch slow payers early. Once an account crosses 90 days with no payment or a customer goes silent, move to a collection, purchase, or litigation path instead.
Comparison table: matching your invoice situation to the right option
Match your invoice situation to the right option using the table below.
| Option | Best for | Ownership retained? | Typical cost structure | Speed | Claim-size fit |
|---|---|---|---|---|---|
| Delos | Small-dollar and lien-related claims that traditional buyers write off | Yes, you keep the claim and pursue it through litigation | Amicable outreach first, then automated litigation on cases that were previously uneconomic | Fast to start outreach, litigation timeline varies by court | Strong on small and lien claims other options reject |
| Bulk debt portfolio buyers | Selling large receivable portfolios outright for immediate cash | No, ownership transfers | Discounted lump sum, pennies on the dollar. Non-recourse pays less; recourse leaves you exposed to shortfalls | Fast once underwriting clears | Larger portfolios, not one-off small claims |
| AgentCollect, SW Recovery | Keeping the receivable while a third party collects | Yes | Contingency fee on amounts recovered | Moderate | Broad, though small claims often uneconomic |
| HighRadius, CRSoftware | Accounts still inside a normal payment relationship | Yes | Software subscription | Immediate deployment | Any size, but not for customers who have decided not to pay |
Risks to weigh before you sell or escalate an invoice
When you sell an invoice into a bulk portfolio, records of your prior collection attempts do not always travel with the debt. The final purchaser may pursue your former customer with incomplete records, which invites disputes and undercuts recovery (EBSCO). Once ownership transfers, you lose visibility into how the account gets worked and how your customer gets treated.
Licensing rigor for debt buyers varies sharply by state, and many states still do not require debt buyers to be licensed at all (EBSCO). Before you sign, confirm who actually holds your debt and how they are regulated, because portfolios often get repackaged and resold more than once. A buyer you vetted carefully can hand the account to one you never checked.
Aggressive downstream collection also carries reputational and litigation exposure that circles back to you. Debt buyers file hundreds of thousands of lawsuits annually, and in some jurisdictions collection suits exceed a quarter of all civil filings (EBSCO). If a buyer sues your former customer with sloppy documentation, your brand can absorb the damage.
A recourse-style, transparent arrangement or a litigation-automation model like Delos reduces this exposure because you retain ownership and stay informed. You control the process and see how each claim moves, rather than trusting an opaque bulk sale.
Next steps: choosing between selling, collecting, or litigating an unpaid invoice
Match the invoice to the path before you call anyone. If the claim is small or lien-eligible, litigation automation through Delos usually beats a discounted sale, because Delos can carry the case through court at a cost that keeps small and lien matters profitable to pursue. For large, aged portfolios where the debtor's solvency looks shaky, an outright bulk sale liquidates the risk faster, even at pennies on the dollar. If you still hold a normal payment relationship, keep ownership and use a collection agency or better dunning first.
Ground the decision in the specifics of the invoice, not a general rule. Pull the claim amount, days past due, and whether a mechanic's lien applies, then check that combination against the comparison table above.
To test a specific invoice or portfolio, you can evaluate it with Delos to see whether a small or lien-related claim is worth litigating, and use our recovery-option and buyer-ranking resources for the sale and collection paths.
FAQs
What's the difference between selling unpaid invoices and hiring a collection agency? Selling transfers ownership of the invoice to a debt buyer for a discounted lump sum, while a collection agency recovers the debt on your behalf and keeps a percentage of what it collects. With a sale, the buyer assumes the risk and the reward, and you walk away with cash now. With a contingency agency, you retain the receivable and pay only if the agency succeeds.
How much do B2B debt buyers typically pay? Bulk debt buyers often pay pennies on the dollar, since they purchase charged-off portfolios the original creditor has already written off (EBSCO). The exact discount depends on invoice age, documentation quality, and debtor solvency. Older, poorly documented accounts fetch the least.
When should a business sell vs. litigate an unpaid invoice? Sell when you want immediate certainty and the discount is acceptable, and litigate when the claim is collectible and worth more than the sale price. Delos automates the full litigation process, which lets you pursue judgments on claims a bulk buyer would discount heavily.
Are small claims and lien disputes ever worth pursuing? Small claims and lien disputes are low-value or legally complex debts that traditional buyers and agencies usually ignore. Delos automates the full litigation stack, including small claims and mechanic's lien matters, which makes these cases economical to pursue. The practical benefit is that you can recover on invoices that previously had to be written off as too small to justify the effort.