Best B2B Collection Agencies for Unpaid Invoices, Ranked

TL;DR

• Traditional agencies work your unpaid invoice on contingency, charging 25-33% of whatever they recover over weeks or months, with no guarantee they collect anything (Kaplan Group).
• Delos AI buys the claim outright at roughly 80% of face value and pays you the same week, then takes on enforcement risk itself. That makes it the fastest, most certain option for sub-$50k claims.
• Pick ABC-Amega or Caine & Weiner for large enterprise portfolios and high-volume, small-balance accounts.
• Pick Cedar Financial when you want early-stage outreach before formal third-party placement, and Collection Bureau of America for a traditional, negotiable A/R and litigation-referral partner.
• Choose contingency for aged, high-balance debt already headed to court, where a percentage of a large number beats an upfront buyout.

Why unpaid B2B invoices need a different playbook than consumer debt

Commercial collection means chasing one business for money another business owes, and the rules differ sharply from consumer debt. B2B claims sit entirely outside the federal Fair Debt Collection Practices Act, which governs only consumer debt (JSD). That legal freedom is why fee structures and tactics swing so widely from one agency to the next.

Claim size and age drive price more than any brand name, which is why generic agency rankings mislead buyers. The Kaplan Group charges 50% on claims under $1,000 but only 10% on claims over $500,000, and it rarely touches small aged accounts at all (Kaplan Group). Age punishes you further. An account is roughly 85% collectible at 60 days past due, dropping to 26% by one year.

A $4,000 invoice six months old and a $200,000 invoice 30 days old need different playbooks. The right question is which structure fits your specific claim, not which agency wins overall.

Comparison table: fee structure, speed, claim size fit, and best-for

The table below puts Delos AI's claim-purchase model against four established commercial contingency agencies so you can see the fee and speed contrast at a glance. Where an agency does not publish its fee percentages or timelines, the row says so rather than guessing.

The contrast the table makes visible is timing and risk. Contingency agencies charge nothing upfront but pay you only after they recover, often weeks or months later, and only if they collect. Delos pays now and absorbs the enforcement risk itself.

Delos AI: buy the claim outright instead of waiting on contingency

Delos operates in a different category than a collection agency. Instead of chasing your invoice on commission and paying you only if it collects, Delos buys the claim outright for around 80% of face value and pays you within the week. You transfer the debt, Delos wires the money, and the enforcement risk moves off your books entirely. That is a purchase, not a placement.

The mechanism that makes this work is full litigation automation, not just a faster dialer. Delos handles amicable outreach as the easy first step, then automates the entire litigation path behind it, including small claims filings and lien-related matters. Automating the expensive, labor-heavy parts of litigation is what changes the economics. A $6,000 claim that a contingency agency slow-walks or declines because the recovery does not justify attorney hours becomes worth pursuing when the filing, service, and follow-through run through software rather than billable hours.

That economic shift is why Delos can price a buyout at roughly 80% on sub-$50k claims. Contingency agencies structure their willingness around effort per dollar, which is why smaller balances draw 25% to 50% commissions and older accounts draw more. Recovery odds fall fast with age, from roughly 85% at 60 days past due to about 26% at one year (JSD). Delos absorbs that decline curve itself once it owns the claim, so your payout does not depend on how the case ages. These are Delos's own operating terms rather than independently audited figures, so confirm the exact percentage against your specific claim.

A traditional agency is still the better fit in three situations. If you are placing a large multi-account portfolio, an agency's scale and volume pricing will usually beat piecemeal claim sales. If you are collecting from a customer you intend to keep, an agency's softer, relationship-aware outreach protects that account better than a debt sale. And if a case is already committed to litigation with counsel engaged, you likely do not need Delos to automate a path you have already chosen.

The Delos advantage is speed and certainty on the claims agencies treat as marginal. For a sub-$50k invoice where you want cash now instead of a maybe in three months, buying the claim outright wins on both counts.

ABC-Amega

ABC-Amega runs as a commercial-only shop, meaning it collects business-to-business debt rather than chasing consumers. The Buffalo-based firm lists four service lines in its regulatory filings: third-party commercial debt collection, first-party receivables outsourcing, industry credit group management, and credit and A/R training (privacyshield.gov). Those credit-group and training arms set it apart from agencies that only work placed accounts, since they tie ABC-Amega into the broader credit-management community your finance team may already touch.

Public fee and timeline data on ABC-Amega is thin. Its filings name its services but disclose no contingency percentages, minimum claim size, or recovery-rate figures, and any success rates the firm publishes on its own site should be read as marketing rather than verified benchmarks. For general framing, commercial contingency rates across the industry cluster at 20-35%, with debt age driving the number up (swrecovery.com). Expect ABC-Amega to fall somewhere in that band, but confirm the exact terms and the timeline to first action directly before you place anything.

Best for: businesses that want a dedicated commercial-only agency with established credit-industry ties and value the outsourcing and credit-group services alongside third-party collection, and who are prepared to request fee and timeline specifics directly.

Caine & Weiner

Caine & Weiner has run commercial and consumer collections for more than 95 years, which gives it a longer operating record than most agencies on this list (Consumer Collections). It handles B2B files on a contingency basis, so you pay only when the agency recovers, though it does not publish a specific percentage. Its stated focus is recovering revenue while protecting the client relationship, a priority that fits businesses collecting from customers they intend to keep.

For companies with many small-balance accounts, Caine & Weiner offers ContactMaster, a flat-fee letter program billed on the number of files and letters rather than a cut of what it recovers (Solutions). Flat-fee letters make sense when individual balances are too small to justify a 25 to 33 percent contingency cut but the total volume still warrants professional demand letters.

Caine & Weiner recommends placing accounts between 60 and 120 days past due, and it notes that earlier intervention raises recovery odds (FAQs). That guidance gives you a concrete placement window, and it lines up with the industry pattern where collection odds drop sharply after six months. For businesses selling abroad, its Global Receivable Solutions partnership extends collection into more than 90 countries.

Best for: businesses with large volumes of small-balance accounts or international receivables that need coordinated cross-border recovery.

Cedar Financial

Cedar Financial runs a two-stage recovery model split between first-party and third-party work, which sets it apart from agencies that only take accounts after they turn delinquent. In first-party recovery, Cedar acts as an extension of your own team on early-stage accounts, using email and SMS reminders before a debt hardens. Third-party recovery handles the late-stage and complex accounts through specialist collectors. The company's own materials describe this split, so treat the specifics as marketing rather than verified performance.

Cedar's industry footprint is broad. Its LinkedIn specialties list B2B and commercial collections alongside medical, educational, government, and international work, plus skip tracing and collections litigation. That range suits businesses that want one vendor across several debt types rather than a commercial-only shop.

Independent fee, timeline, and recovery data for Cedar Financial is not publicly available. Its own materials disagree on basic facts like founding date and headcount, so ask for written fee percentages, first-action timing, and claim-size minimums before you sign.

Best for: businesses that want an early-stage first-party outreach layer, applied while invoices are still fresh, before escalating to formal third-party placement.

Collection Bureau of America

Collection Bureau of America operates as a traditional commercial collection shop, but it publishes almost none of the numbers you need to compare it against the others on this list. No contingency percentage, no timeline to first action, and no recovery-rate benchmark appears publicly. Agencies in this category typically run size-based tiers, charging around 20% on claims between $5,000 and $50,000 and dropping toward 10% on claims over $500,000, per the Kaplan Group benchmarks.

Treat that as a starting point for negotiation, not a quote. Before you sign with any agency in this mold, ask three concrete questions. What is the exact contingency rate for your claim size and age, how many days until they attempt first contact, and do they refer accounts to litigation counsel or handle it in-house. A firm that customizes A/R management and litigation referral should answer all three without hesitation.

Best for: businesses that want a traditional, customizable accounts-receivable and litigation-referral partner and are prepared to negotiate fee terms and timelines directly.

How the fee math actually plays out on a $10,000 invoice

Take a single $10,000 invoice, 90 days past due, and run it through both models. A commercial agency in the $3,000 to $10,000 tier typically charges 25% to 35% contingency, which competitor rate cards put in that range. Recover the full amount and you net $6,500 to $7,500, but only after weeks or months of calls and letters, and only if the debtor pays at all. Partial recovery or a no-pay outcome leaves you with less or nothing.

Delos buys the same claim outright at roughly 80% of face value and pays that week, according to the company's own figures. You net about $8,000, immediately, and Delos absorbs the enforcement risk from there. The certainty matters as much as the dollar amount, because contingency leaves you carrying the collection risk while you wait.

Contingency math wins once the numbers get large. On a $500,000 claim, a 10% to 15% rate leaves you $425,000 to $450,000, well above 80% of a smaller balance, and the agency has the volume to justify sustained effort. The upfront buyout advantage holds on sub-$50k claims, where traditional agencies charge the steepest percentages and move the slowest.

Which option fits your claim

Match your choice to claim size, age, and whether you already expect to sue. Delos AI fits sub-$50k claims where you want cash this week rather than a payout that may or may not arrive months later. It also fits matters a contingency agency slow-walks or declines, including small claims and lien-related disputes, because Delos automates the full litigation path and can profit on cases too small for traditional firms to work hard.

A traditional agency earns its place when the economics run the other way. Large multi-account portfolios, aged high-balance debt, and ongoing client relationships you need to preserve all favor an agency's scale and softer touch. On a $500,000 claim, a 10 to 15 percent contingency can net you more than an 80 percent buyout, and a firm with a litigation bench makes sense when court is already the clear next step. Size the claim first, then pick the model.

How we evaluated these agencies

We ranked each agency on four criteria: fee transparency, speed to first action, claim size fit, and service scope. Fee transparency measures whether an agency publishes its contingency percentage or flat-rate structure at all, because most do not. Speed to first action and claim size fit come from published placement guidance or first-party company statements where available.

Where a competitor published no verifiable figure, we marked the field "not publicly disclosed" rather than repeating an estimate as fact. ABC-Amega, Cedar Financial, and Collection Bureau of America disclose no specific contingency percentages, recovery rates, or claim-size thresholds we could independently confirm. General industry ranges from swrecovery.com appear as context only, never attributed to any named agency.

FAQs

What is a typical contingency fee for B2B collections?

Commercial contingency rates commonly run from 10% to 50% of the amount recovered, with the percentage scaling inversely to claim size and directly to claim age (Kaplan Group). A fresh $10,000 invoice might carry a 20% rate, while a $1,000 claim can hit 50%. You only pay when the agency collects, so nothing is guaranteed.

When should I place an account with a collection agency?

The standard recommendation is 60 to 90 days past due, once your own follow-up has stalled (JSD). Place sooner if a previously responsive debtor goes silent or breaks payment promises, since recovery odds drop sharply with age. An account near 60 days is collectible around 85% of the time, falling toward 26% by one year.

Is there a minimum debt amount for collections?

No federal minimum applies to commercial debt, since the Fair Debt Collection Practices Act governs consumer collections only. Most agencies still prefer accounts of $100 or more, because automated administrative costs eat the return on anything smaller.

How does claim purchase differ from contingency collection?

A contingency agency works your invoice for a commission and pays you only if it recovers. Delos instead buys the claim outright at roughly 80% of face value and pays you the same week, per its own company terms. Delos then carries the enforcement and litigation risk itself, so your recovery no longer depends on the outcome.