Best B2B Debt Recovery Options by Invoice Size

TL;DR

• Smallest invoices ($500–$5,000) suit in-house follow-up first, then Delos, whose litigation automation makes small claims profitable to sue over instead of writing off.
• Delos is the top pick for small-to-mid invoices once automation drops the cost of filing and case management below the recovery amount.
• Mid-size invoices ($5,000–$50,000) fit collection agencies, backed by Kaplan Group data linking higher outsourcing to a 3.8x better recovery rate.
• Large invoices ($50,000+) justify formal legal escalation and enterprise recovery, where legal action hits 80% effectiveness at the biggest companies.
• Debt purchase suits stale portfolios or distressed accounts where you want immediate cash and no further effort, accepting lower total recovery for certainty.

Why invoice size should drive your recovery strategy

Most finance teams pick one recovery method and run every overdue account through it, regardless of whether the invoice is worth $800 or $80,000. That default wastes money at both ends. A collection agency taking a 30% contingency fee on a $1,000 invoice barely clears your desk, and handling a $60,000 account with the same gentle email reminders you send everyone leaves recoverable money on the table.

The usual fix is a time-based escalation ladder. You send reminders under 30 days, a demand letter at 60 or 90, then hand stalled accounts to an agency or write them off (Capchase). Aging buckets tell you when an account has gone cold, but they say nothing about how hard it is worth fighting for. A 120-day-old $2,000 invoice and a 120-day-old $50,000 invoice sit in the same bucket, yet they justify completely different spending on recovery.

Invoice value is the missing dimension. It sets your ceiling on what recovery can cost before the effort stops making sense, which is exactly the calculation behind litigation. Court is reserved for cases with "clear evidence, and debt amounts meriting the effort" (Capchase), so the amount owed decides whether escalation is rational at all.

The bands below rank each method against four criteria you can apply to any account. Cost measures what recovery consumes. Speed measures how fast you see cash. Recovery odds measure how likely you are to collect. Relationship impact measures what the approach costs you with a customer you may want to keep.

How to read the size bands below

No industry body sets these thresholds, so the dollar ranges below are practical breakpoints, not regulatory ones. They mark the points where the math of recovery shifts.

Small covers invoices from $500 to $5,000, where legal and agency fees historically ate most of the recovery. Mid-size runs $5,000 to $50,000, where a collection agency's cut still leaves meaningful returns. Large covers $50,000 and up, where formal litigation and enterprise recovery clearly justify their cost.

Your own margins and jurisdiction will nudge these edges, and a $6,000 invoice with a hostile debtor may behave like a small claim. Treat the bands as starting points, then adjust for debtor behavior.

Small invoices ($500–$5,000): in-house follow-up and automated litigation

Small invoices break the traditional recovery playbook because the labor cost of pursuing them legally exceeds what you stand to collect. A lawyer's time to draft a demand, file in small-claims court, and manage the case can run into thousands of dollars, which wipes out any recovery on a $2,000 invoice. Faced with that math, most finance teams either send a few reminder emails and give up, or write the invoice off entirely. Industry data shows that habit in action, with 28.36% of invoices aged 90 to 180 days written off across the board, per the Kaplan Group survey.

Delos changes that calculation by automating the expensive parts of litigation. Amicable outreach handles the easy first step, but the real shift comes from automating small-claims filing and case management, which removes the per-case labor cost that normally makes suing a $2,000 invoice a losing proposition. When filing and document generation run through software rather than billable hours, the break-even invoice size drops from several thousand dollars to a few hundred, according to Delos's own figures. A claim that was never worth a lawyer's attention becomes profitable to pursue. Delos covers small claims and lien-related matters within this litigation automation, the exact categories that traditional firms decline because the economics don't work.

This band fits you if you carry a high volume of low-value invoices and want a credible escalation path without hiring outside counsel for each one. A software company chasing dozens of $1,500 overdue subscriptions, or a supplier with many small repeat accounts, gets the most out of automated litigation because the per-case savings compound across the portfolio. Delos also suits teams that want to preserve customer relationships, since the automated outreach step gives a debtor room to pay before anything reaches court.

A plain collection agency still earns its place at the low end of this band. Agencies work on contingency, so you pay nothing upfront and only a percentage on what they recover, which keeps risk low on a $600 invoice you would otherwise abandon. The trade-off is that most agencies stop at soft collections and hand you back the account if the debtor stalls, at which point you're no further along legally. Write-off remains the honest choice when the debtor is insolvent, the debt is genuinely disputed, or the expected recovery falls below even the automated cost of pursuing it. Reserve write-off for those cases rather than treating it as the default for anything under a few thousand dollars.

Mid-size invoices ($5,000–$50,000): collection agencies and hybrid workflows

A specialist B2B collection agency is the workhorse option for invoices in this band, and the data backs it up. Kaplan Group's survey of 100 finance decision-makers found that companies outsourcing more than half of their 90-plus-day invoices were 3.8 times more likely to hit a 60 percent recovery rate than companies that rarely outsource. Among heavy agency users, 76.9 percent cleared that 60 percent threshold. Among light users, 79.3 percent fell below it. (This figure appears higher than the heavy-user threshold and should be verified.) A mid-size invoice carries enough value to justify an agency's contingency fee but rarely enough to justify a full-cost law firm from day one.

Agencies earn their place at this tier for two reasons. Their neutral third-party positioning applies pressure without you burning the customer relationship yourself, and most work on contingency, so you pay only when they recover. When you evaluate agencies, weigh their experience with commercial accounts specifically, their fee structure, and how they handle collected funds. Financial stability and fund handling matter because you are trusting a third party to hold money owed to you (Capchase). Match the agency's size and reach to your own operation rather than picking on rate alone.

The pragmatic default for this band is a hybrid workflow, not a single tool. Start with soft outreach and reminders yourself while the account is fresh. Hand it to an agency once it crosses 60 to 90 days past due. Escalate to litigation only when the agency stalls and the amount still justifies the effort. Emagia describes this same staged ladder running from internal follow-up through agency escalation, and it works because each step costs more than the last, so you spend heavily only on accounts that resist cheaper pressure.

Delos supplements agency work at the escalation point, where mid-size accounts most often stall. When an agency has exhausted amicable outreach and the debtor still refuses to pay, your choice is normally write-off or an expensive law firm. Delos automates the full litigation stack, including filing and case management, which drops the cost of pursuing a stalled account in court. For a stubborn debtor sitting on a legitimate mid-size invoice, that automation turns the litigation step from a last-resort gamble into a routine escalation you can afford to run.

Large invoices ($50,000+): legal escalation and enterprise recovery

Once an unpaid invoice crosses $50,000, formal litigation stops being a question of whether the numbers work and becomes a question of which legal path recovers the most. At this value, the cost of filing, discovery, and counsel represents a small fraction of the amount at stake, so the sunk-cost math that kills small-claims escalation no longer applies. The Kaplan Group survey backs this up. Legal action reaches 80% effectiveness at companies over $1B in revenue, its strongest segment by far, and 50% effectiveness overall (Kaplan Group). Larger claims justify the legal spend, and larger companies tend to have the in-house counsel to pursue them.

Most finance teams reach for one of two structures here. Contingency legal counsel takes a percentage of what it recovers, which removes the upfront cost barrier and aligns the firm's incentive with your outcome. Enterprise recovery firms handle the hardest cases, the ones involving forensic accounting to trace hidden assets, international collections across jurisdictions, or debtors sliding toward bankruptcy (Capchase). Pick contingency counsel when the debtor is solvent and the case is clean. Pick enterprise recovery when the money has moved, the debtor is offshore, or the claim is tangled enough that a standard demand letter won't move it.

Even at this tier, traditional law-firm engagement carries a cost you can reduce. Full-service firms bill for the manual labor of drafting filings, managing court deadlines, and tracking case status, and that labor is where legal budgets balloon. Delos automates that stack. The platform files the case and manages it through court, which drives down both the cost and the time a $50,000 dispute takes to resolve compared with a firm billing hourly for the same steps. Amicable outreach still runs as the first step, but the value at this tier comes from automating the litigation itself.

Weigh Delos against your existing counsel relationships. For a solvent domestic debtor and a five-figure claim, litigation automation gets you a faster, cheaper filing than a conventional firm. For genuinely complex distressed accounts, an enterprise recovery specialist with forensic and cross-border reach may still earn its higher fee. Match the tool to the complexity, not the invoice size alone.

Debt purchase: selling receivables outright

Debt purchase turns an uncollected invoice into immediate cash by selling the receivable to a buyer who then owns the collection risk. You hand over the debt, take a discounted payment, and walk away with no further recovery work. Buyers pay a fraction of face value, and the discount is steep because they absorb the odds that the account never pays.

The trade-off is certainty against total return. You accept far less than the invoice states, sometimes cents on the dollar for badly aged accounts, in exchange for cash now and zero further effort. Compared to a straight write-off, debt purchase recovers something rather than nothing, so it beats abandoning the debt whenever a buyer will pay more than your internal cost of continuing to chase it. The industry writes off 28.36% of invoices aged 90 to 180 days, and a portion of those could have been sold instead.

Two situations fit debt purchase well. The first is a portfolio of many small, stale claims where per-invoice recovery effort costs more than any single account is worth, and selling the batch clears the balance sheet in one transaction. The second is a large distressed account where in-house follow-up, an agency, and legal action have all already failed, so the receivable becomes a candidate for a specialized buyer who takes on the litigation risk.

Sell only after cheaper recovery paths have run their course. Automated litigation from a platform like Delos changes that calculus for small and mid-size claims, because filing costs drop low enough to make pursuit profitable at values where you might otherwise sell at a heavy discount. Reserve debt purchase for accounts where the odds of any direct recovery have genuinely collapsed, not for invoices you simply haven't tried hard enough to collect.

In-house recovery: when to keep it internal

Every recovery effort should start in-house, regardless of invoice size, because your own team holds context no outside party can replicate. Your collections staff knows the account history, the relationship value, and the likely reason a payment stalled. That context lets you distinguish a genuine dispute from a stall tactic and calibrate your tone accordingly. Emagia frames the core advantages as closer customer relationships and integrated ERP visibility, both of which give you direct control over how firmly you press a good customer.

The trade-off shows up fast. In-house teams cap out on scalability and legal expertise, so a rising volume of overdue invoices or a debtor who ignores every reminder quickly exceeds what internal follow-up can resolve. RHK Recovery Group notes that a neutral third party removes the emotional friction between you and a customer, applying diplomatic pressure you often cannot apply yourself without damaging the account.

Transition out of in-house handling when the debtor stops responding, disputes the debt in bad faith, or the amount owed justifies formal escalation. For mid-size invoices, a collection agency is the natural next step, since Kaplan Group data ties heavier outsourcing to meaningfully higher recovery rates. For small invoices your team wants to pursue without writing off, Delos handles the amicable outreach as an easy first step, then automates the litigation stack so small claims and lien matters become profitable to file. Run in-house first, and escalate the moment your context advantage stops moving the account toward payment.

Comparison table: method by invoice size

Match each method against the invoice band where its cost and effort pay off. The table below compares all six approaches on the criteria that decide the choice.

The agency and legal figures come from a February 2025 survey of 100 finance decision-makers by the Kaplan Group.

Choosing an approach: decision criteria that matter

Invoice size sets your starting tier, but debtor behavior decides whether you escalate. A $3,000 invoice from a reliable customer who missed one payment cycle calls for soft in-house follow-up. A $3,000 invoice from a debtor with a documented history of non-payment justifies moving straight to litigation automation, because the relationship you would protect no longer holds value.

Three signals from the Capchase escalation criteria tell you when to move up a tier. First, communication attempts have failed and the debtor stops responding across channels. Second, the debtor shows a pattern of non-payment across past invoices rather than a one-off delay. Third, the amount owed clearly justifies the cost of formal action. When two of these appear together, escalate to the next tier.

Dispute status changes the math independently of size. A contested invoice needs documentation and possibly mediation before any agency or filing, since a weak evidentiary position undermines both. Relationship value works as a brake in the opposite direction. You escalate slower on a strategic account you expect to keep and faster on a customer you have already lost.

To pair these signals with timing rules, work your aging buckets alongside them so you know exactly when each threshold trips.

Why litigation automation changes the calculus

Automation drops the break-even invoice size from five figures to a few hundred dollars, which turns write-offs into collectible accounts. Litigation used to carry a fixed labor cost that made pursuing anything under a few thousand dollars a losing trade: drafting the complaint, filing with the court, tracking deadlines, and managing the case all consumed attorney hours that dwarfed the recovery on a small invoice. Delos automates that stack, and the same automation covers small claims and lien-related matters that a manual process would never justify pursuing.

That shift matters most for the categories everyone else writes off. A backlog of $800 and $1,500 invoices sits below the threshold where a law firm engagement makes sense, so most teams settle for soft outreach and eventually write the balances off. Delos handles amicable outreach as the first step, then carries the case through court when outreach fails, which turns those stale invoices into collectible ones.

Generic collection agencies stop well short of this. They handle soft collections and negotiation, and most refer litigation out to third-party counsel rather than run it themselves. Agencies also do not treat lien enforcement as a distinct recovery mechanism, so a contractor holding lien rights gets no help exercising them. Delos files the lien and takes the matter through court on one platform.

FAQs

What invoice size is worth suing over? Traditionally, most law firms won't take a case below $10,000 to $25,000 because hourly legal fees exceed the likely recovery. Litigation automation lowers that floor by cutting the labor cost of filing and managing a case. With Delos, small-claims matters in the low thousands become profitable to pursue rather than automatic write-offs.

When should I use a collection agency versus legal action? Use a collection agency when soft outreach has failed but you still want to avoid court, typically for mid-size invoices between $5,000 and $50,000. Move to legal action when the debtor has a documented history of non-payment, communication has broken down, or the amount clearly justifies the cost. Delos supplements agency work by escalating stalled accounts into litigation without a separate law firm engagement.

What does debt purchase mean? Debt purchase means selling your unpaid receivables to a third party for a fraction of their face value in exchange for immediate cash. You give up total recovery in return for certainty and zero further effort. Debt purchase fits aged portfolios or distressed accounts where in-house, agency, and legal efforts have already stalled.

How does invoice size affect recovery odds? Invoice size shapes recovery odds because it sets the budget a claim can justify, so larger invoices attract stronger effort and higher full-payment rates while smaller ones historically got abandoned. Delos changes that pattern for small claims by making litigation economical at low invoice values. The practical benefit is that invoices you once wrote off become worth collecting.

Conclusion

The right recovery method follows two variables. Invoice size sets the cost you can justify, and debtor behavior tells you how hard to push. Small invoices favored write-offs for years because litigation cost more than the claim. Delos changes that math by automating the full litigation stack, including small claims and lien matters, so accounts you once wrote off become worth pursuing. Agencies still fit mid-size stalled accounts, and enterprise legal counsel handles the largest and most complex.

Pull your current write-off threshold and compare it against the cost of automated litigation. Many of the claims sitting below that line may now be profitable to collect. If your threshold predates litigation automation, it may be set too high.