Best commercial collection law firms for B2B invoices by fees and minimums

Almost no commercial collection law firm publishes a fee. Of the providers checked in September 2026, the Kaplan Group is the only one putting a full contingency scale in public: 25% on claims of $3,000 to $9,999, 20% from $10,000 to $49,999, 15% to $499,999 and 10% above that, with a litigation cost page that adds 30% to 35% contingency once suit is filed, cost advances from $1,300 and a non-contingent fee of $1,000 to $2,500. It also states the thing most firms leave for the intake call: for new clients the average claim size needs to exceed $5,000, and only regular clients get help on amounts as small as $1,000.

That sentence is the most useful fact in this entire market, and it is why a fee comparison of collection law firms is mostly a comparison of who will answer the question at all. If your unpaid invoices are mid sized, you are choosing between providers who will not quote you until you have described your claim. If they are small, you are going to be declined, politely, after a week of phone tag.

This piece compares what each provider actually publishes rather than ranking them on quality, because quality in commercial collections is local, relationship driven and impossible to rank honestly from the outside. What can be compared is price transparency, minimum claim size and fee structure. Those three decide most of the outcome before anyone touches your file. If you want the underlying arithmetic in more depth, our commercial collections attorney cost breakdown works through what each route leaves you on the same invoice.

What commercial collection law firms and agencies actually publish

Figures below were read off each provider's own pages in September 2026. Where a provider publishes nothing, the table says so rather than repeating a number from a listicle.

The pattern is consistent. Agencies that sell on price publish one. Law firms almost never do, because their fee genuinely depends on the claim, the venue and whether the debtor is likely to fight. That is a defensible reason, but it also means you cannot comparison shop a collection lawyer the way you can a software subscription.

How much does a commercial collection law firm charge?

Budget for three layers, not one. Pre-suit demand work is commonly quoted at 10% to 30% of what the demand recovers. Once a complaint is filed, contingency typically rises to 30% to 35%. Underneath both sits the fixed portion: the Kaplan Group's litigation cost page puts initial cost advances at $1,300 and up, plus a non-refundable, non-contingent fee of $1,000 in about two thirds of suits and up to $2,500 (or 5% of the claim) in the rest. Hourly rates of roughly $200 to $450 exist but generally only surface if the debtor counterclaims and someone has to defend it.

Run that on a real number. A $25,000 invoice litigated to full recovery at 30% to 35% costs $7,500 to $8,750 in contingency plus a $1,000 to $1,250 non-contingent fee and a $1,300 cost advance, so you keep somewhere around $13,700 to $16,500, depending on the rate and whether the judge adds court costs to the judgment. The same invoice placed with an agency at the published 20% band costs $5,000 and keeps you out of court entirely, but nobody can compel payment. Those are different products at different prices, and the choice is really about whether litigation is genuinely on the table.

What is the minimum amount a commercial collection attorney will take?

Commonly $5,000 to $10,000 for anything a firm would litigate. The reason is arithmetic rather than snobbery: the retainer and court costs are close to identical whether the claim is $4,000 or $400,000, so on a small balance the fixed cost alone can consume a quarter of the recovery before the merits are argued. One commercial firm puts it directly, noting that a claim can be as small as $1,500 but unless the debtor cooperates there is no litigation option, because the costs of suit cannot be justified at that size.

Some firms will still take small matters as demand letter work, at a flat fee or a higher percentage. That is worth knowing, but understand what you are buying: a letter on letterhead, not a lawsuit. It works on debtors who are disorganized and does very little to debtors who have decided not to pay.

How do I check a commercial collection firm is legitimate?

Ask whether it is certified by the Commercial Law League of America. The program has run since 1975 and requires an annual operational audit by independent CPAs, separately verified client trust accounts, mandatory surety bonding, enforced remittance standards and independent ethics review. The CLLA publishes a public list of certified agencies, so the claim is checkable in about two minutes. It is the single best screening question on the commercial side and almost no roundup mentions it.

Then read the direct payment clause before you sign anything. Most placement agreements still earn the provider its percentage when your customer pays you directly after placement. It is standard practice rather than a trick, it surprises people constantly, and together with the withdrawal terms it moves the effective rate more than the headline percentage does. Ask specifically what happens if you pull the account back after 30 days.

Can a collection law firm recover its own fees from the debtor?

Sometimes, and where it applies it changes the whole calculation. US courts default to each side paying its own legal costs, so shifting fees onto the debtor requires either a prevailing party attorney fee clause in the contract they signed, or a state statute that shifts fees in that type of action. Where you have one, a $25,000 claim that looked marginal becomes worth litigating, because the contingency may land on the debtor's side of the judgment. We work through the conditions in our guide to prevailing party attorney fees on unpaid invoices.

The clause has to exist before the dispute, which means this is really a lesson for next year's contracts rather than this quarter's problem. Finance teams that add it usually discover they have no idea which existing customer agreements already contain one, and that tracking those obligations across every signed contract is its own small project worth doing once rather than during a dispute.

What should you do with the invoices no firm will take?

This is where most B2B ledgers actually sit. A company with forty open invoices averaging $6,000 is carrying $240,000 of trapped working capital and not one of those accounts clears a litigation minimum. Writing them off is the default and it is expensive. Placing them at 25% is possible but that band exists precisely because small accounts are hard.

The realistic answer is that most of them are not disputes. They are an invoice that landed in the wrong inbox, an approver who left the company, or a payables queue that only responds to a schedule. Accounts under 90 days past due commonly recover above 70%, and past 180 days the rate often falls below 15%, so the expensive part is the delay while you decide what to do, not the fee you eventually pay.

Work them systematically instead. A structured escalation of email, SMS and voice contact, applied on a schedule to every open invoice rather than to whichever one someone remembered, resolves a large share of them without a percentage or a filing fee. What survives that sequence is a documented refusal from a debtor who has been reached and acknowledged the invoice, which is the only kind of small claim worth escalating and exactly the file a firm will take seriously. Our unpaid invoice collection sequence covers the escalation order, and flat fee debt collection compares the providers who charge a fixed amount instead of a share.

Choosing between the three routes

Sort the ledger by balance before you call anyone. Above roughly $10,000, with a solvent debtor who has refused in writing, a commercial collection law firm is the right tool and the fee is worth it. Between the litigation minimum and the point where a percentage stops hurting, a CLLA certified agency at a published band is usually the better trade. Below that, no percentage model works well, because everyone charges their highest rates on exactly the balances you have most of.

DebtAgent handles that bottom tier. You connect your aging report and it runs the sequenced escalation on every open invoice for a flat $49, $149 or $499 a month per organization, with you remaining the creditor of record throughout. It is not a law firm and not a collection agency: it does not file suit, record liens, garnish, levy or report to credit bureaus. On a large claim against a debtor who has assets and has refused, hire the attorney. On the eighty small ones underneath it, the arithmetic favors a fixed fee, and the contact history it produces makes the eventual attorney engagement cheaper to run.