Money you've earned means nothing if it sits uncollected on someone else's desk. Aged accounts receivable (AR) tracks how long your firm's invoices have gone unpaid, and that number tells you more about financial health than almost any other metric on the balance sheet.

Here's the core idea: every invoice your firm sends gets stamped with a date. As days pass without payment, that invoice moves through aging buckets. The standard buckets are Current (0-30 days), 31-60 days, 61-90 days, and 90+ days. The further an invoice drifts down that ladder, the less likely you are to collect it. Industry data consistently shows that once an invoice passes 90 days, the probability of full collection drops sharply.

Why does this matter for practice management? Because AR aging is the bridge between profitability on paper and actual cash in the bank. A firm can show strong revenue on its income statement while slowly drowning because clients aren't paying. Cash flow projections become unreliable when a large chunk of receivables sits in the 60+ day buckets. You can't make payroll, cover rent, or invest in growth with unpaid invoices.

The ARE expects you to evaluate AR aging data, calculate metrics like Days Sales Outstanding (DSO) and collection ratios, and make strategic decisions about when to escalate collection efforts or write off bad debt. You'll need to connect aging patterns to broader firm health indicators like the current ratio, working capital, and overhead coverage.

Think of aged AR as a vital sign. A healthy firm keeps most receivables in the Current bucket, monitors DSO monthly, and has clear policies for when invoices slip past 60 or 90 days. A struggling firm ignores aging reports and wonders why it can't cover expenses despite booking strong project fees.