Accounts Receivable Collections: From First Reminder to Final Resolution

Accounts receivable collections is the process of recovering money that customers owe your business after invoices go past due. For B2B companies, it's one of the most important operations to get right, and one of the most neglected. Over 55% of B2B invoices are paid late, costing the average company roughly $39,000 per year in follow-up costs alone.

This guide covers the full AR collections lifecycle: what accounts receivable looks like in practice, how the collections process works at each stage, and which approaches give you the best recovery rates.

What are accounts receivable collections?

Accounts receivable (AR) is the money customers owe you for goods or services you've already delivered. Collections is the work of actually getting that money paid. Together, AR collections covers everything from sending the first payment reminder to escalating unpaid invoices through legal channels.

The distinction matters because many businesses treat AR as an accounting function (tracking who owes what) but neglect collections (actually recovering the money). Tracking a $15,000 overdue invoice in your ledger doesn't improve cash flow. Calling the customer and getting a payment commitment does.

In B2B, collections operates differently than consumer debt collection. The amounts are larger, the relationships are ongoing, and the goal isn't just recovery. You want to get paid while keeping the customer.

Accounts receivable examples in B2B

AR shows up across every industry where businesses invoice other businesses. The dynamics vary, but the pattern is consistent.

Construction and trades. A plumbing contractor installs a commercial system for $28,000. The general contractor's payment terms say Net 60, but actual payment arrives at 90 days. The subcontractor is financing someone else's project for three months out of pocket.

Staffing agencies. A staffing firm places five temporary workers at a client site. Weekly invoices of $12,000 go out, but the client batches payments monthly. The agency pays workers from its own cash while waiting 30 to 45 days for reimbursement.

Professional services. An IT consulting firm completes a $45,000 project in three phases. The client disputes the final phase invoice over scope, holding up the entire remaining balance for months.

Wholesale distribution. A food distributor delivers $8,000 in product weekly to a restaurant chain on Net 30 terms. After four weeks, the outstanding balance sits at $32,000, and the chain's AP department processes payments "when they get to it."

In every case, work is done, invoices are sent, and payment lags behind. The longer it lags, the harder collection becomes. Recovery rates drop from roughly 90% at 60 days past due to around 50% at 90 days, and continue declining with every passing week.

The AR collections process, step by step

Effective collections follows a natural escalation from friendly to firm. Each stage serves a different purpose.

Days 1 to 15: Payment reminder

The invoice is freshly overdue. Most of the time, the cause is administrative: the invoice went to the wrong email, AP hasn't processed it yet, or someone forgot. A friendly reminder resolves the majority of these within days.

Days 16 to 30: Follow-up

If the first reminder didn't produce payment, something else is happening. Maybe the customer has cash flow issues, or there's a dispute they haven't raised yet. This is where phone calls become critical. Phone-based follow-up achieves 40 to 60% response rates compared to 15 to 25% for email, making calls roughly three times more effective at surfacing the real issue.

Days 31 to 60: Formal demand

The tone shifts from reminding to requesting. This stage usually involves a formal written demand (sometimes called a dunning letter) that documents the outstanding amount, references previous contact attempts, and outlines what happens next if payment isn't received. In many jurisdictions, this formal notice is a legal prerequisite before you can charge late payment interest or collection costs.

Days 61 to 90: Escalation decision

This is the critical fork. You decide whether to continue handling the account internally, engage a collection agency, or pursue legal action. The right call depends on the amount, the relationship, and how the customer has responded so far. Complete silence after 60 days is a very different signal than "we need two more weeks."

Days 90+: External collection or legal action

Accounts that reach 90 days without resolution typically need professional intervention. Recovery rates at this stage are significantly lower, and agency fees (20 to 35% of whatever they recover) reduce your take further. The average collection agency recovers roughly 20% of the total face value placed with them.

Internal vs external collections: when does each approach work?

Most businesses get this decision wrong. Not because the question is complicated, but because timing makes all the difference.

Internal (first-party) collections

Your team handles follow-up directly. This approach works best in the first 60 days, when response rates are highest and the customer relationship matters most.

Advantages: You keep the relationship. You have the full context on the account (project details, prior conversations, any disputes). And you keep 100% of recovered funds.

Limitations: It takes real time. Small businesses report spending hours each week on payment follow-up. Many business owners find collection calls uncomfortable, so the calls don't happen, and invoices age quietly in the background.

External (third-party) collections

A collection agency handles follow-up on your behalf, typically on contingency (20 to 35% of what they collect).

Advantages: Professional persistence, legal expertise, and skip-tracing for customers who've gone completely silent. Agencies are most useful for accounts over 90 days old where your own efforts have stalled.

Limitations: You give up a significant portion of recovered funds. The customer relationship is effectively over. And overall recovery rates for external agencies average 20 to 30% across all placed accounts.

The practical answer: both, timed correctly

The data supports a layered approach. Handle everything under 60 to 90 days internally or with automation. Escalate to an agency only after exhausting your own efforts on accounts that have gone fully silent. The worst outcome is doing nothing for 90 days and then handing the account to an agency when recovery odds are already low.

Best practices for accounts receivable management

Strong AR collections isn't about being aggressive. It's about being consistent and starting early. These practices separate businesses with healthy cash flow from those constantly chasing payments.

Set clear terms before work begins. Payment terms, late fees, and your escalation process should be in the contract and on every invoice. Ambiguity works in the slow payer's favor.

Follow up on day one. The best-performing AR teams send a reminder the day an invoice becomes overdue. Companies that automate this step reduce DSO by an average of 23 days.

Pick up the phone. Email works for the first nudge. After that, phone calls are roughly three times more effective. If your team can't make the calls, find a way to automate them.

Log every interaction. Every email, call, and promise-to-pay should be documented. This protects you legally and makes escalation smoother when the time comes.

Segment by behavior, not just by age. A reliable customer who's 15 days late is different from a new customer who's 15 days late and ignoring calls. Prioritize based on risk signals, not only the calendar.

Offer payment plans early. A customer who can't pay $20,000 today might manage $5,000 per week. Partial payment beats no payment, and it keeps the door open for future business.

How AI-powered collection software is changing AR

The biggest gap in most AR collections processes isn't the strategy. It's execution. 77% of AR teams report they can't keep up with their invoice volume. Businesses know they should call on day 7 and follow up on day 14, but there aren't enough hours.

This is where accounts receivable automation is having the largest impact. Rather than replacing the collections process, automation tools fill the execution gap and make sure every overdue invoice gets consistent follow-up at every stage.

AI voice agents represent the newest development in this space. They handle the follow-up calls that most businesses skip entirely: calling on schedule, adapting tone based on how long the invoice has been overdue, capturing payment commitments and dispute details, and sending payment links via SMS during the conversation. It's the same proven escalation process, executed consistently across every account without requiring your team's time.

The AR automation market reached $3.4 billion in 2025 and is projected to hit $5.95 billion by 2030. Meanwhile, 72% of finance leaders now report using AI tools in their function, up from 34% just a year earlier. The shift from email-only AR automation toward voice-capable collection software reflects what the data has shown for years: the phone call is the most effective collection channel, and it's also the hardest to scale.

Dunwise is built around this idea. The agent handles the full collection sequence from friendly reminders through formal follow-up, sending invoices and payment links during the call and routing disputes to your team. You keep the relationship and 100% of recovered funds.

Key takeaways

• Accounts receivable collections covers the full cycle from overdue invoice to resolution. Over 55% of B2B invoices are paid late, costing the average company nearly $40,000 per year.
• Phone calls are roughly three times more effective than email for collections, yet most businesses don't make them consistently.
• Handle the first 60 days internally. Recovery rates are highest in this window, and the customer relationship still matters.
• External agencies make sense only for accounts past 90 days that have gone completely silent. Expect to pay 20 to 35% of whatever they recover.
• AI-powered AR automation fills the biggest gap in most collection processes: consistent, on-schedule follow-up across every account.