When to send an invoice to collections

A practical decision tree for the 90-days-past-due moment — by invoice size, customer relationship, and cost of the next step.

There's a moment in every unpaid-invoice lifecycle where in-house follow-up has run its course and the question becomes: escalate, or let it go? The answer depends on four variables, and most owner-operators guess badly on at least two of them.

This guide walks the decision tree. It's not a universal answer — it's a framework that reduces the decision to four inputs, so the math is at least explicit.

Input one: invoice age

Under 30 days past due, in-house is almost always the right answer. You haven't exhausted polite options, the customer may be genuinely forgetful rather than avoiding, and any escalation now probably damages a relationship you'd want to keep.

Between 30 and 60 days, automated voice follow-up — whether that's your staff calling or a service — has strong recovery odds. Most of the invoices that pay will pay in this window. Escalation here is usually premature.

Past 60 days, recovery odds drop sharply. Past 90, you're in decision-tree territory: agency, attorney, or write-off.

Input two: invoice size vs cost of next step

The four escalation paths differ in economics:

• Collections agency: typically takes 30 to 50 percent of what they recover. Zero upfront cost. Small claims workflows are not their best use — they work best on mid-size commercial balances.
• Attorney demand letter: usually $250 to $1,500 flat, sometimes billed hourly. Adds real pressure. Under $5,000 in invoice value, the math often doesn't work.
• Small-claims court: filing fees vary by state but typically a few hundred dollars, plus your time. Works well for commercial balances under your state's small-claims cap (commonly $5,000 to $10,000).
• Write-off: no direct cost, but a tax and emotional write-off. Sometimes the rational answer.

The right path is the one whose cost is a smaller fraction of expected recovery than the others. For a $500 invoice, write-off is usually right. For a $50,000 invoice, small claims is probably wrong (over the cap) and an attorney is probably right.

Input three: the customer relationship

If this is a customer you'd want to keep — a repeat client, someone in your industry's small world, someone whose referral network matters — escalation is usually the wrong answer regardless of invoice size. Collections agencies and lawsuits end relationships. Calm, persistent in-house follow-up preserves them.

If the customer has ghosted, blocked your calls, or moved to an uncontactable state, the relationship has already ended. Escalation has no relationship cost because there's no relationship left to protect.

Input four: your evidence

Before any escalation, you need documentation: the contract, the invoice, delivery proof, and your full follow-up history. If you have call recordings, SMS threads, or email replies where the customer acknowledged the debt, those are gold.

A good rule: if you can't produce a clean packet for a new party (agency, attorney, small-claims court), the escalation won't work anyway. Spend the hour building the packet first.

Before you escalate: exhaust the low-cost options

Before the 90-day decision is even on the table, the day-3 / day-7 / day-14 / day-30 cadence from the pillar collection guide should already have run its course. A short summary, because skipping any rung of the ladder makes everything later harder:

• Day 3: polite reminder email. Friendly tone, invoice number, payment link. No demand language. Treats the customer as forgetful until proven otherwise. The vast majority of invoices that pay late pay here.
• Day 7: a phone call. A short, polite voice contact recovers invoices that twelve emails won't. Compliant voicemail if you don't reach them.
• Day 14: firmer tone. Switch from reminder to direct ask: "When can we expect payment?" Offer a payment plan if cash flow is the real issue. Document the response in your accounting software.
• Day 30: formal written notice. Email plus certified mail for larger balances. Reference the contract, the late-fee terms (if any), and the escalation path if payment doesn't arrive.
• Day 60: final pre-escalation contact. Calm, direct, deadline-bearing. "If we don't have payment or a written commitment by [date], we'll escalate this account."

Studies typically cite recovery ranges of 35–50 percent for accounts past 90 days, and recovery odds drop sharply with each additional 30 days. If you reach the decision tree with a customer who's been chased once a week for ninety days, you have both better recovery odds and a much stronger evidence packet than if you reach it cold. The Syntharra cadence runs this ladder automatically; the reduce-DSO guide breaks down why each rung matters in operational terms.

Collections agencies — what they do and how they price

A collections agency takes assignment of your past-due account, pursues it under their own brand and license, and remits a percentage of what they recover.

Pricing is almost always contingency: typically 30 to 50 percent of recovered dollars, with the higher end on older or smaller accounts. Some agencies also offer flat-fee or "first-party brand" services where they call as if they were your business; those usually have a different fee structure and different compliance implications.

How agencies pick which files to work hard on:

• Account size. A $20,000 commercial balance gets attention. A $400 balance gets a letter and a soft pull on the credit file. The math of contingency means agencies follow the dollars.
• Recency. The shorter the elapsed time since last payment activity, the better the recovery odds. Agencies prefer accounts no older than 180 days for a reason.
• Documentation quality. A clean packet — signed contract, delivery proof, and a customer who has acknowledged the debt in writing — converts at much higher rates than an account where the agency has to reconstruct the history themselves.
• Customer locatability. Skip-tracing is part of the agency's job, but if the customer's contact info is current and the address verifies, your file moves to the front of the queue.

A typical agency timeline is 90 to 180 days from assignment to either recovery or return. Most of what's going to recover, recovers in the first 60.

Red flags in agency contracts:

• No reporting cadence. A reputable agency sends weekly or monthly status updates. "Trust us, we'll let you know" is a sign you'll never hear from them again.
• Mandatory exclusivity longer than 180 days. You should be able to pull files back after a defined window if no recovery has occurred.
• Vague compliance representations. Ask in writing for their license number, their FDCPA training program, and their complaint history. A real agency answers all three quickly.
• Demand for advance payment. Legitimate contingency agencies don't charge upfront fees. If they do, they're either a non-traditional outfit (sometimes legitimate, often not) or a scam.

For a fuller side-by-side, see the Syntharra vs. collections agency comparison. For a simple definition you can paste into a process doc, the collections agency glossary entry.

Attorneys and demand letters

A demand letter from an attorney's letterhead lands differently than a fifth email from your bookkeeper. That's almost the entire mechanism: the letter signals that the next step is a lawsuit, and most debtors who can pay would rather pay than litigate.

Pricing is usually one of three structures:

• Flat fee per letter. $250 to $1,500 is the common range, depending on the firm and the complexity. Includes drafting, sending via certified mail, and a brief response window.
• Hourly retainer. For larger or more complex matters where the demand letter is the opening move and not the whole engagement.
• Contingency. Less common for collections, more common when the matter is large and the recovery odds are good. Contingency on collections work is usually 25 to 40 percent and rare under five-figure invoice values.

How to find a small-business-friendly collections attorney:

• Local bar referral service. Most county bars run a referral service that matches you with an attorney for a free or low-cost initial consultation.
• Other small-business owners. A trade association or local Chamber of Commerce will usually have a name or two of attorneys who handle collections work for businesses your size.
• The attorney who already does your business work. Even if they don't do collections themselves, they likely know two or three people who do.

What a demand letter actually contains:

• Identification of the creditor and debtor.
• A clear statement of the debt: amount, invoice or contract reference, date the obligation arose.
• A demand for payment by a specific date, usually 10 to 30 days from the letter's date.
• A statement of the consequence of non-payment: typically suit, but sometimes also referral to credit bureaus, lien recording, or other remedies depending on the underlying contract.
• The attorney's signature and contact information.

Some letters also reference attorney's fees provisions in the contract, statutory interest, or collection costs that may be added to the balance. The demand letter glossary entry has a one-paragraph definition.

A demand letter is not a lawsuit. It's the shot across the bow that says one might be coming. If the customer pays in response, great. If they don't, you have a clean record of a formal demand to use later — and a decision to make about whether the lawsuit is actually worth filing.

Small claims court — the DIY escalation

Small claims is the people's court of debt collection. Filing fees are modest (usually $30 to $200 depending on state and balance), filings are usually fill-in-the-blank forms, and lawyers are often barred or simply not necessary.

State caps vary widely:

• Most states fall in the $5,000 to $10,000 range.
• A few are higher (Tennessee allows up to $25,000; Delaware up to $25,000 in JP Court for some matters).
• A few are lower (Kentucky $2,500; Rhode Island $2,500).

Check your state's specific cap before you file. A claim filed for an amount above the cap either gets dismissed or has to be voluntarily reduced to the cap.

The filing process, in broad strokes:

1. File the complaint with the appropriate court (usually the county or district court covering the debtor's residence or business location).
2. Pay the filing fee.
3. Serve the defendant — usually by sheriff, certified mail, or process server.
4. Show up on the hearing date with your evidence: contract, invoice, delivery proof, follow-up history.
5. The judge issues a ruling, usually the same day.

Likelihood of winning is high if your evidence is clean and the customer has no real defense — most small-claims collection cases are uncontested or easily decided in the creditor's favor.

Likelihood of collecting is the harder question. Winning a judgment is one thing; getting paid on it is another. A judgment against an insolvent debtor — someone with no garnishable wages, no bank accounts you know of, and no leviable property — is a paper trophy. You can attempt to enforce through wage garnishment, bank levy, or property liens (mechanisms vary by state), but each step is more time and sometimes more cost. Some judgments sit on the books for years and are eventually written off as uncollectible despite being legally good.

The honest framing: small claims is worth the filing fee when the debtor is solvent and the dollar amount fits under the cap. It's not worth it when the debtor has nothing, regardless of the underlying dispute. Winning is not the same as getting paid.

Factoring vs collections

A worth-mentioning aside for owner-operators with cash-flow pressure: invoice factoring and AR financing are not collections strategies. They are financing strategies — a way to get cash today against invoices you expect to be paid eventually.

• Factoring sells the invoice to a factor at a discount (commonly 1 to 5 percent of face value, depending on terms and customer credit). The factor takes over collection. You get cash now; the factor takes the credit risk and the recovery work. Recourse vs. non-recourse factoring is the key term-sheet question — see the invoice factoring glossary entry.
• AR financing uses the invoice as collateral for a line of credit, but you keep title to the receivable and stay responsible for collection. Cheaper than factoring usually, more administrative work. The AR financing glossary entry has the definition.

Neither solves the problem of an invoice that's already 90 days past due. Factors and AR financiers underwrite based on customer credit and invoice age; nobody wants to buy your hairiest receivables. Factoring belongs in the cash-flow-management toolkit, not the collections toolkit. Bring it up here only because owner-operators sometimes confuse the two.

The write-off — tax and emotional

A write-off is the formal acknowledgment that a debt is uncollectible and the corresponding accounting entry that removes it from active receivables.

Mechanics differ by accounting method:

• Accrual method. You recognized revenue when the invoice was issued; you now write off the receivable as bad debt. The expense partially offsets the revenue you recognized. There's a real tax effect, and your accountant will handle the entry.
• Cash method. You only recognize revenue when cash is received. You never recognized the unpaid invoice as income, so you don't get a bad-debt deduction for it — you simply never had the income. Cash-method businesses can't write off bad debt because there was never income to write off.

Most small businesses operate on the cash method, which means a $5,000 unpaid invoice represents $5,000 of forgone potential income with no tax offset. The cash math is harsh, which is part of why writing off should be a deliberate decision, not a reflex.

Recordkeeping after a write-off:

• Keep the original contract, invoice, and follow-up history for at least seven years. The IRS standard is generally three years for routine returns and seven years for bad-debt claims, and many state statutes of limitations on contract debts run four to six years (see the statute of limitations glossary entry).
• Note the write-off date and reason in your records. If the customer ever resurfaces and pays, that's a recovery on a previously written-off debt — booked differently than a current-year sale.
• The bad-debt glossary entry and the charge-off glossary entry cover the related vocabulary.

The emotional write-off matters too. An invoice that's been on your aging report for nine months is a daily small drain on attention. Sometimes the right move is to write it off, free up the mental real estate, and put the energy into work that's going to pay.

A write-off is not a permanent waiver of the debt. The underlying obligation persists until the statute of limitations runs. If the customer reappears and offers payment, you can absolutely accept it. The write-off is an accounting acknowledgment, not a legal release.

Hybrid strategies — Syntharra first, agency later

A common pattern that out-performs sending everything to an agency at 90:

1. Days 0 to 90 — automated voice follow-up at scale. Recover the easy majority. Past-due customers who can pay and just need the nudge generally pay during this window. Recovery rates for in-house or AI-driven automated outreach in this window are typically the highest you'll see anywhere.
2. Day 90 — sort the survivors. Of the accounts that haven't paid in 90 days, a fraction are genuinely stuck: customer disputes the invoice, customer is insolvent, customer is uncontactable. Triage them.
3. Days 90 to 180 — escalate the stuck ones individually. Send the disputable accounts to an attorney (demand letter or filing). Send the contactable-but-non-paying accounts to an agency. Write off the insolvent ones.

The math on this sequence usually beats a "send everything to the agency at 90" policy by a meaningful margin. The agency takes 30 to 50 percent on the recovered dollars; the automated phase takes a much smaller cut and recovers a higher fraction of the easy accounts. Sending everything to the agency at 90 means you pay agency contingency on accounts that would have paid you cleanly with one more polite call.

Syntharra's voice cadence is built to be the first phase of this hybrid: it runs through 90 days, hands the survivors back to your team with a recommendation, and lets you pick the path. The Syntharra vs. collections agency comparison has the side-by-side, and the Syntharra vs. doing nothing comparison has the math against the alternative of just sitting on the past-due AR.

A worked example

To make the framework concrete: an HVAC company finishes an $8,000 emergency commercial service call in early January. Net 30 invoice. By mid-February the invoice is 14 days past due. By mid-April it's 90 days past due. The customer — a small property management firm — has stopped responding to email and the office number rolls to voicemail. The owner is trying to decide what to do next.

Run the four inputs:

• Age: 90 days. Past the easy-recovery window. Decision-tree territory.
• Size: $8,000. Above the small-claims cap in some states, under it in others. Above the breakeven for an attorney letter ($250–$1,500). Above the floor where a collections agency will work the file seriously.
• Relationship: the customer ghosted. No future business expected. No relationship cost to escalation.
• Evidence: the work order, the signed service agreement, the invoice, two emails the property manager sent acknowledging the work was completed satisfactorily before they went dark. Strong packet.

Map the options:

• Collections agency. $8,000 is in their sweet spot. At a 35 percent contingency, a successful recovery nets $5,200. Cost is the time to assemble the file (couple of hours).
• Attorney demand letter. A $750 demand letter has a reasonable chance of triggering payment without further action; if it doesn't, the attorney can file suit. Total cost likely $750 to $2,000 if it goes past the letter; recovery if successful is the full $8,000 minus fees.
• Small claims. If the customer's location is in a state with a $10,000 cap, this works. Filing fee around $100, plus the time for service and a hearing. If you win and the customer is solvent, you get paid; if they're not, you have a paper judgment.
• Write-off. $8,000 of forgone revenue, plus the cost of delivering the work (equipment, labor, truck time). Real loss probably $4,500 to $6,000 depending on margin.

In this scenario the hybrid play is usually best: send the demand letter first because the cost is bounded and the trigger rate is reasonable. If no response in 30 days, file in small claims (if the cap allows) or assign to an agency. Don't go straight to write-off — the evidence is too clean and the dollar amount is too large.

The decision is different if the dollar amount changes. At $800, the demand letter math is borderline and the agency takes too much; write-off may be right. At $80,000, the demand letter is a setup for litigation that you should engage a lawyer to walk through end-to-end.

The point is that the framework gives you the inputs; the outputs depend on the specific numbers.

The relationship question

The hardest call in collections is the one between recovering the dollar and ending the relationship.

Some heuristics:

• If the customer is a one-time buyer who's gone dark, escalate. No relationship to protect. The math is purely about expected recovery.
• If the customer is a repeat buyer who's hit a rough patch, work with them. Offer a payment plan (the payment plan generator tool builds them in two minutes). A repeat customer in temporary distress is often more valuable five years from now than the disputed invoice is today.
• If the customer is a strategic account whose referrals you depend on, the answer is almost never "send to agency." It's "owner picks up the phone for an honest conversation." Even if you write off the dollar, the relationship may carry the future business that more than makes up for it.
• If the customer is in your industry's small world, careful. A collections action on a peer in the same trade circulates faster than you'd expect. Sometimes that's appropriate (it deters non-payment from the people watching). Sometimes it's a self-inflicted wound to your reputation.

Two scripts for the two ends of the spectrum:

• Soft, when relationship matters: "We're 90 days out on this one and we want to work with you. Can we set up a conversation this week? If cash flow is the issue, let's talk about a payment plan that works on your timeline."
• Firm, when relationship is gone: "We've made repeated attempts to reach you about invoice [number] for the work completed on [date]. If we don't have payment or a payment commitment in writing by [date], we'll escalate this account to outside collection on [date plus seven]. We'd prefer not to."

The firm version usually triggers either payment or a final answer; either is better than ambiguity. The soft version preserves optionality and signals that you'd rather solve than fight. Use whichever fits the customer.

Pick one path, don't straddle

A common mistake: dabbling with an agency while still sending your own letters. Customers who see conflicting outreach from two parties sometimes respond by disputing everything, which weakens both paths. Pick one, commit to it, give it a defined window, and then reassess.

A workable rhythm: assign to the agency, give them 90 to 120 days exclusively, then pull the file back if no recovery. Don't second-guess them mid-window with side calls. If the first agency doesn't recover, the second has worse odds — accept that and reassess whether the file belongs in litigation, write-off, or one more attempt.

What "write-off" actually costs

A write-off on a $2,000 invoice isn't just $2,000 off the books — it's your cost to deliver that work, plus the bookkeeping to charge it off, plus the tax treatment your accountant walks you through. For many service businesses, the real loss on a written-off invoice is 50 to 70 percent of invoice value, because most of the cost was delivering the work itself. Don't write off reflexively; model the actual loss first.

The good news is that the same arithmetic that makes a write-off expensive also makes recovery valuable. Every dollar recovered on a past-due invoice is, after you net out the small marginal cost of collection, almost pure margin. That's why the hybrid strategy beats the all-agency strategy — the extra recovery you capture in the automated phase is cheap dollars.

The four-input framework, the cadence ladder, the hybrid sequence, and the honest math on each escalation path together let you make this decision with your eyes open. There is no universal right answer. There is a right answer for each invoice, given its size, its age, its customer, and its evidence. The work is to do the math instead of guessing.