Accounts receivable aging is a report that categorizes outstanding customer invoices by how long they've been unpaid, typically in 30-day buckets, to identify collection risks.
Definition
Accounts receivable (AR) aging is a financial report that sorts all unpaid customer invoices into time-based categories — current (0-30 days), 31-60 days, 61-90 days, and 90+ days past due. The report shows exactly how much money is owed to your company, by whom, and for how long. For service businesses, AR aging is the primary tool for cash flow management and collection prioritization. The longer an invoice goes unpaid, the less likely you are to collect it. Industry data shows that invoices at 30 days past due have a 95% collection probability. At 60 days, it drops to 85%. At 90 days, 72%. At 120+ days, you're looking at 50% or less. For a service company with $150,000 in receivables, having $30,000 in the 90+ day bucket means $15,000 of that may never be collected. Most specialty trade companies have AR problems they don't fully recognize because they look at total receivables without examining the aging distribution. A company with $200,000 in total receivables might feel fine until they realize $65,000 of it is over 60 days and deteriorating. Proactive AR management — following up at 7, 14, and 30 days — prevents invoices from aging into the danger zone.
Why It Matters for Your Business
Cash flow kills more service businesses than lack of work. You can be fully booked with $500,000 in backlog and still go bankrupt if customers aren't paying on time. AR aging reveals the health of your cash flow in real time. A company with 85% of receivables under 30 days is healthy. A company with 40% over 60 days has a collection crisis whether they know it or not. Every week an invoice ages past 30 days, the cost of collection increases and the probability of payment decreases.
How Accounts Receivable Aging Works Across Industries
Fire sprinkler companies doing commercial work deal with property management companies and general contractors who are notorious slow payers. Net-30 terms routinely stretch to net-60 or net-90. A company with 200 commercial accounts might have $80,000-$150,000 in receivables at any given time. Without active aging management, 15-25% of that sits past 60 days. Automated invoice reminders at 7, 21, and 35 days dramatically reduce aging past 30 days.
HVAC companies face different AR dynamics by customer type. Residential customers on credit card pay immediately. Commercial customers on net terms average 38 days. Property management companies average 52 days. A company that doesn't segment AR aging by customer type treats all receivables the same and misses the pattern: their PM accounts need earlier follow-up and stricter terms.
Crane invoices are large — $5,000-$50,000 per job. A single unpaid crane invoice can represent a significant cash flow problem. General contractors on large projects sometimes hold crane payments as leverage for project disputes. Crane companies that require progress payments, deposits, and lien waivers before releasing equipment protect their AR from aging into the danger zone.
Before & After AI
Real-World Examples
A fire sprinkler company had $142,000 in receivables with $48,000 (34%) over 60 days. They implemented AI-automated payment reminders and personalized follow-up sequences. Within 90 days, 60+ day receivables dropped to $20,000 (14%). Cash flow improved by $28,000/month, eliminating the need for the line of credit they'd been using to cover payroll.
A commercial HVAC company had $32,000 in invoices over 120 days that they'd mentally written off. AI sent a structured collection sequence to each account with payment plan options. $21,000 was collected within 45 days, including several accounts that simply hadn't been followed up on. The $32K wasn't uncollectable — it was just unfollowed-up.
A crane service company analyzed AR aging by customer type and found that first-time customers accounted for 72% of invoices over 90 days. They implemented a 50% deposit requirement for new customers. AR over 90 days dropped from $68,000 to $12,000 within two quarters, and the deposit policy became a standard qualification tool.
Key Metrics
Frequently Asked Questions About Accounts Receivable Aging
At least 70-80%. If less than 70% of your receivables are current, you have a collection problem. Best-in-class service companies keep 85-90% of AR under 30 days. If your percentage is lower, start with automated reminders at 7 and 14 days — most people pay when reminded.
Day 1 after the due date. A friendly reminder at day 7, a firmer reminder at day 14, a phone call at day 28, and escalation to the owner at day 45. The companies that wait until day 60 to start following up are already in the danger zone. Early, consistent follow-up prevents most aging problems.
Yes, but disclose them upfront in your service agreement. A 1.5% monthly late fee on a $5,000 invoice is $75/month. More importantly, the existence of the fee motivates timely payment. Most customers who know about the fee pay on time. The ones who don't pay on time despite the fee have cash flow problems that require a conversation.
AI sends reminders with the right tone at the right time. Early reminders are friendly and helpful: 'Just a reminder that invoice #1234 is due next week.' Later reminders are firmer but professional. The consistency matters more than the tone. Most customers appreciate the reminder because they simply forgot. The awkward personal phone call from the owner is reserved for genuine collection problems, not routine follow-up.
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