Accounts Receivable Collections: From Overdue to Paid

Accounts receivable collections is the process of recovering payment on outstanding invoices after they have passed their due date. In B2B credit, it spans a range from a friendly reminder email on day 31 to a formal demand letter to placing the account with a collections agency. Most of what happens in between is judgment.

Every B2B company has an AR collections process, even if they have never written it down. The question is whether that process is reactive, triggered by an aged invoice, or built to catch deteriorating accounts before the invoice ages in the first place.

What Is Accounts Receivable Collections?

Accounts receivable collections is the set of activities a business takes to collect payment from customers who have not paid on time. It sits at the end of the order-to-cash cycle: goods or services were delivered, an invoice was sent, payment terms passed, and money did not arrive.

The collection effort typically escalates through defined stages: reminder, follow-up, formal notice, demand letter, and (in cases of nonpayment) third-party collections or legal action.

For B2B credit teams, this is not a one-size-fits-all workflow. A customer who pays net 45 instead of net 30 gets a different response than a customer whose DSO has been climbing for six months while their credit file shows deteriorating trade references.

The Five Stages of B2B Collections

Stage 1: Overdue reminder (days 1 to 15 past due)

The first contact is usually a polite reminder. Most late payments at this stage are genuine oversights: AP did not process the invoice, the invoice went to the wrong contact, a check is in the mail. Email is appropriate here. The goal is to confirm receipt and get a commitment. The overdue invoice guide covers specific language and timing.

Stage 2: Follow-up (days 16 to 30 past due)

If a reminder produced no payment and no credible response, a phone call is warranted. The credit rep should speak directly with AP or the contact who signed the contract, confirm the invoice is in their system, and get a specific payment date. Not a commitment to "look into it."

Stage 3: Formal notice (days 31 to 60 past due)

At this point, the situation is no longer routine. The account should go to a credit hold review. A formal written notice goes out citing the amount, the original terms, the current status, and the consequences of continued nonpayment. This is also when you pull a fresh credit picture on the customer. If the customer has an open past-due balance and wants to place a new order, the past due invoice guide has a playbook for handling both tracks without conflating them.

Stage 4: Demand letter (days 61 to 90 past due)

A demand letter is a legal-adjacent document stating that payment is required by a specific date or action will follow. It can be sent by the credit team or escalated to an attorney. The letter should include the exact amount owed, the original invoice dates, payment instructions, and a clear deadline. The demand letter guide covers the full structure.

Stage 5: Third-party collections or legal action (90+ days past due)

At this stage, the relationship is effectively over. A collections agency typically takes 25 to 40 percent of recovered amounts. Legal action takes longer and costs more but gives you a judgment you can enforce. Neither path is free, which is why the goal of a strong AR collections process is to avoid Stage 5 entirely.

Where Most B2B Credit Teams Get It Wrong

The most common failure in AR collections is not the script or the escalation path. It is timing.

By the time an invoice hits 60 days past due, the average B2B company has already missed two or three signals that should have flagged this account weeks earlier. A customer whose invoice is 60 days past due probably had an aging overdue balance on the previous invoice, a declining payment trend over the last two quarters, or a trade reference that came back soft. Most credit teams did not see it because they were not watching.

There is a real difference between collections as a workflow and collections as a symptom. The workflow is necessary: reminder, follow-up, formal notice, demand. But it responds to something that has already gone wrong. A monitoring process that flags accounts before the invoice ages is what prevents the workflow from becoming the main event.

HighRadius and Bectran both build AR automation that accelerates the collections workflow: automated dunning emails, aging reports, promise-to-pay tracking. Those capabilities are real. Neither platform tells you that a customer's Altman Z-score dropped six months ago, or that two of their other suppliers just filed collection notices. That is the signal layer that changes what you do in stage one, before the invoice is even overdue.

The Collections Escalation Framework

A clear escalation policy prevents two failure modes: the credit rep who lets an account drift to 90 days because no one told them to escalate, and the credit manager who goes straight to legal on a $4,000 dispute that a phone call would have resolved.

A reasonable B2B escalation framework by invoice age:

• Days 1 to 15: AR coordinator sends reminder email
• Days 16 to 30: AR coordinator calls AP contact, confirms payment timeline
• Days 31 to 45: Credit rep notifies account manager, places soft hold on new orders, sends formal notice
• Days 46 to 60: Credit manager reviews account file, assesses credit risk update, escalates to senior AR or legal depending on amount
• Days 61 to 90: Demand letter sent; decision on collections agency vs. legal made by credit manager
• 90+: Escalate to outside counsel or agency; write off portion of balance per policy

Dollar thresholds should adjust these timelines. A $400 invoice gets a different process than a $400,000 one.

Preserving the Customer Relationship During Collections

The goal of collections is payment. The secondary goal is preserving the relationship if the account is worth keeping. Those two things are often in tension, and the credit team is usually holding both simultaneously.

Keep the account manager in the loop before, not after. If you are placing a credit hold on a customer, the sales rep should know before the customer finds out they cannot order. Surprises in credit are almost always avoidable and almost always create friction that did not need to exist.

Separate the overdue conversation from the new-business conversation. When a customer has an open past-due balance and is trying to place a new order, do not conflate the two tracks. Handle collections on its own track and the new order on its own. Mixing them creates leverage dynamics that nobody wins.

Know your customer's situation before you call. A credit manager who calls about an overdue invoice without knowing that the customer is in the middle of a merger, has a new CFO, or just took a large vendor dispute is going to have a harder conversation than necessary. Pull what you can before you pick up the phone.

When to Send a Dunning Letter vs. a Demand Letter

Both dunning letters and demand letters are written notices requesting payment. The distinction is tone and legal weight.

A dunning letter is a progressively escalating series of reminders, from gentle to firm, used to prompt payment before the situation becomes adversarial. Dunning letters live in stages 1 through 3 of the collections process.

A demand letter is a formal document used in stages 4 and 5. It names a specific deadline and specifies consequences. It can be drafted by the credit team but is often reviewed by legal before sending.

If you are at stage 3 with a customer and have not gotten a response, a demand letter is usually the right call, not another dunning reminder.

Tracking AR Collections Performance

The primary metric for collections effectiveness is days sales outstanding (DSO). A rising DSO is the first signal that collections is failing somewhere: in the process, the escalation policy, or the credit decisions made upstream.

Other metrics worth tracking:

• Collections effectiveness index (CEI): Measures how much of the collectible AR was actually collected in a given period. A CEI below 85 percent typically means the collections process has a structural problem, not just a one-off difficult customer.
• Average days to collect by customer segment: Shows whether collections issues are concentrated in a particular customer tier, a sales channel, or a payment method.
• DSO by industry benchmark: If your DSO is 58 days in an industry where the median is 42, that is a collections and credit terms problem. The DSO by industry benchmarks covers 2025 data across 30+ sectors.

If your AR turnover ratio is declining quarter over quarter, that is a leading indicator worth watching before DSO moves. The accounts receivable turnover ratio guide has the formula and what the benchmark ranges mean.

Collections as a Signal, Not Just a Workflow

AR collections does not operate in isolation. For credit teams running customer portfolio monitoring, the collection stage is a lagging indicator. It tells you what is already broken.

The credit event that matters is the one three or four months before the first missed invoice: the customer whose payment patterns slowed, whose credit file updated, whose industry started showing stress. Monitoring those signals is covered in the B2B credit risk monitoring guide. The collections process picks up from there.

Past-due invoices are the receipt. The transaction happened months earlier.

Frequently Asked Questions

What is accounts receivable collections?

Accounts receivable collections is the process a business uses to recover payment from customers who have not paid their invoices by the due date. It typically escalates from reminders to formal notices to demand letters and, in some cases, third-party collections or legal action.

How long should you wait before sending an account to collections?

Most B2B credit policies escalate to formal collections actions between 60 and 90 days past due. The right timeline depends on invoice size, customer history, and whether the customer is communicating. A $400,000 account with no response after 45 days warrants faster escalation than a $3,000 account with a credible promise to pay.

What is the difference between dunning and collections?

Dunning refers to the series of reminders sent before an account is considered delinquent, typically days 1 through 45 past due. Collections is the formal process of recovering payment once standard reminders have failed, often involving demand letters, payment arrangements, or third-party agencies.

Does sending an account to collections hurt the customer relationship?

Almost always. A third-party collections referral effectively ends the business relationship. Demand letters create adversarial dynamics. This is why the goal of a strong collections process is to resolve the situation before it escalates, through monitoring, early escalation, and clear internal policies.

What metrics should B2B teams use to evaluate collections performance?

DSO, collections effectiveness index (CEI), and average days to collect by customer segment are the three most useful. A CEI below 85 percent typically signals a process problem. Rising DSO without a corresponding revenue increase signals collections failure.