- Accounts Receivable (AR)
- Money your customers owe you for goods or services already delivered. It's a current asset on your balance sheet.
- Days Sales Outstanding (DSO)
- Average number of days it takes to collect cash after invoicing. Lower is better. Calculated as (AR / Revenue) × Days in period.
- Aging buckets
- AR grouped by age: current (0-30 days), 31-60, 61-90, and 90+. Older buckets are riskier and may need write-offs.
- Healthy DSO
- Varies by industry. SaaS often 30-45 days. Professional services 30-60 days. Construction or government can run 60-90+.
- Why it matters
- AR locks up cash. A growing AR balance with no growth in revenue means collection is slowing, often the first sign of cash trouble.
What AR is and how it works
When you deliver a service or product and invoice a client, you've earned revenue. If they haven't paid yet, that amount sits in accounts receivable, it's an asset on your balance sheet representing money owed to you. When they pay, cash goes up and AR goes down. The total AR balance at any point tells you how much outstanding revenue you're still waiting to collect.
AR represents money customers owe you for work already delivered. The day you invoice a client, AR goes up. The day they pay, AR goes down and cash goes up. In between, the amount sits as a current asset on your balance sheet. The size and aging of AR tells you a lot about customer behavior and your collection effectiveness.
For a healthy services business, AR typically represents 30-60 days of revenue. If your monthly revenue is $500K and AR is $750K, you have about 45 days outstanding, not great, not terrible. If AR is $2M on $500K monthly revenue, you have a collection problem that is tying up $1.5M of working capital that should be cash.
The AR aging report
The most useful AR tool is the aging report, which breaks your outstanding invoices down by how long they've been unpaid: current (not yet due), 1-30 days past due, 31-60 days, 61-90 days, and 90+ days. The older the invoice, the less likely it is to be collected. A large 90+ day bucket is a warning sign, either your collection process is broken or you have clients who aren't going to pay.
The AR aging report groups outstanding invoices by how long they have been unpaid. Current (not yet due), 1-30 days past due, 31-60 days, 61-90 days, 90+ days. Each bucket tells a different story. Current is normal. 1-30 is slight delay. 31-60 needs attention. 61-90 needs active collection. 90+ is a warning sign and often requires a write-off decision.
The shape of the aging report matters. A company with 80% current and 20% aged has a normal collection pattern. A company with 40% current and 60% aged has either collection problems or a structural issue with their customer base. Tracking the aging mix over time reveals whether your collection is improving or deteriorating.
Getting paid faster
The single biggest lever on AR is payment terms. Net-30 is standard, but many businesses can negotiate shorter terms, Net-15 or even payment on delivery, especially for new clients or smaller engagements. Upfront deposits for project work eliminate AR risk entirely on that portion. Automated payment reminders, online payment links, and auto-pay arrangements all reduce the friction of getting paid.
Getting paid faster starts with invoicing quickly. Invoicing on the day of delivery instead of waiting for month-end shaves 15 days off your collection cycle immediately. Automated payment reminders at day 5, 15, and 30 past due collect 10-15% faster than manual follow-up. Accepting ACH and credit card payments reduces the friction for customers who want to pay promptly.
Early-payment discounts can work but have to be sized carefully. A 1% discount for net-10 (vs net-30) sounds small but is effectively a 12% annualized return. If your cost of capital is lower than that, the discount pays off. For most growth-stage companies, the discount is worth it because cash in hand is more valuable than the 1% saved.
When AR becomes a problem
AR becomes a cash flow problem when it's growing faster than revenue, meaning clients are paying more slowly, or when a significant balance is concentrated in one or two clients who are past due. Both situations require active management, not just monitoring. The best AR management is proactive: clear terms upfront, systematic follow-up, and early escalation when payments are late.
AR becomes a problem in three ways. First, it grows faster than revenue, a sign that collection is deteriorating. Second, the aged buckets grow, a sign that specific customers are becoming delinquent. Third, individual customers represent more than 15-20% of AR, a sign of concentration risk. Any of these should trigger action.
The action depends on which problem. For slow collection generally, tighten the process (faster invoicing, more aggressive reminders). For specific delinquent customers, direct conversation with the specific customer. For concentration, diversify the customer base. Ignoring AR problems usually leads to write-offs, which are essentially losses that were preventable.
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