Most small businesses do not fail because they're unprofitable. They fail because they run out of cash while waiting to be paid for work they've already delivered. Accounts receivable — the money customers owe you — is where this drama plays out. Manage it well and you have a self-funding business. Manage it badly and you spend half your time chasing invoices while your operating account drains.
This guide covers everything that matters: how to read an aging report, the formula and benchmarks for days sales outstanding (DSO), how to design a credit policy, what a real collections workflow looks like, when to write off bad debt, and the concrete tactics that reliably cut late payments.
What Accounts Receivable Actually Is
Accounts receivable (AR) is a current asset on your balance sheet representing money customers have committed to pay but have not yet paid. It only exists if you extend credit — that is, if you deliver goods or services before collecting payment. Cash-on-delivery businesses (most retail, most consumer SaaS) have very little AR. B2B businesses, professional services, and any business invoicing for net-terms work all carry significant AR.
AR is not revenue — revenue is recognised when you earn it (in most accounting standards). AR is the bridge between earning revenue and actually banking cash. A $50,000 invoice issued today increases AR by $50,000 today and reduces it to zero only when the customer pays.
The AR Aging Report
If you only learn one AR concept, learn this one. The aging report buckets every unpaid invoice by how overdue it is:
| Aging bucket | What it means | Typical action | Collection probability |
|---|---|---|---|
| Current (not yet due) | Within payment terms | No action; one reminder 3 days before due | ~98% |
| 1–30 days past due | First slip | Friendly reminder + statement | ~92% |
| 31–60 days past due | Material lateness | Phone call + formal email | ~75% |
| 61–90 days past due | Real risk | Demand letter; pause new work | ~50% |
| 91+ days past due | Likely bad debt | Final demand or third-party collection | ~20% |
The collection probability column is roughly stable across small-business studies and is the reason aging matters so much: an invoice you let slip from 30 days to 90 days has lost about 75% of its expected value. The single best thing you can do for cash flow is keep AR out of the right-hand columns.
Days Sales Outstanding (DSO)
DSO answers one question: on average, how many days does it take you to convert a sale into cash?
DSO = (Accounts Receivable / Total Credit Sales) × Days in PeriodWorked example. Your AR balance at the end of Q1 is $90,000. Your credit sales for Q1 were $300,000. DSO = (90,000 / 300,000) × 90 = 27 days. That's healthy.
Benchmarks vary by industry — construction and professional services often run 45–70 days, IT services 30–45, retail B2B 25–40. The right comparison is not industry but trend. A DSO trending up by 4–5 days per quarter is a leading indicator of cash trouble even if your P&L looks fine. Watch the trend more than the absolute number.
Building a Credit Policy
A credit policy is a written rulebook for when you extend credit, on what terms, and how you escalate when it goes wrong. For a small business it can be one page. The components:
- Who gets credit. Default terms, plus thresholds for credit checks (e.g. any first-time customer over $5,000 requires a credit reference or trade reference).
- Standard terms. Your default — Net 14, Net 30, 50% deposit + balance on delivery, etc. Pick the shortest that customers will accept; longer is not a competitive advantage, it's a working-capital tax.
- Credit limits. Maximum unpaid balance per customer. A customer at their limit gets a polite "we can't ship more until the current invoice is paid."
- Discounts and penalties. Early-pay discount (e.g. 2/10 Net 30 — 2% off if paid within 10 days). Late-payment fees (commonly 1.5% per month) clearly stated on the invoice.
- Escalation ladder. The exact sequence of actions and timing for unpaid invoices (see below).
A Collections Workflow That Actually Works
The best collections process is boring, scheduled, and automated. Drama is for amateurs.
- Day −3 (before due): Friendly reminder. "Just a heads up — invoice #1042 is due Friday." Optional but reduces accidental lateness by ~30%.
- Day +1 (one day late): Polite first-late reminder with a copy of the invoice and a payment link.
- Day +7: Second reminder. Slightly firmer tone. Phone call if the customer is significant.
- Day +14: Formal email from a senior person (you, the owner) acknowledging the lateness and asking when payment will be made.
- Day +30: Pause new work or shipments. Send formal demand letter referencing late-payment terms.
- Day +60: Final demand. State that the next step is third-party collections or legal action.
- Day +90: Either turn over to a collections agency or write off and pursue tax relief.
Automating steps 1–3 with your accounting tool is the single highest-ROI change most small businesses can make. It removes awkwardness and makes the schedule the bad guy rather than you.
Bad Debt and the Allowance for Doubtful Accounts
Some receivables become uncollectible — customer bankruptcy, dispute, disappearance. There are two ways to handle this in your books:
- Direct write-off. When a specific invoice is confirmed uncollectible, expense it. Simple but lumpy — your P&L takes the full hit in one period.
- Allowance method. Estimate bad debt as a percentage of credit sales (typically 0.5–3% depending on industry) and book a provision each period. Write-offs are then charged against the allowance, not the P&L. Smoother and required under most accounting standards (US GAAP, IFRS).
Cash-basis sole proprietors can usually skip the allowance and just write off. Anything more formal (LLC with investors, anything VC-backed, anything audited) typically uses the allowance method.
The Five Tactics That Most Reduce Late Payments
- Invoice same-day. Don't batch invoices weekly. The clock starts when you send.
- Shorten terms. Net 14 beats Net 30 unless your customer specifically requires Net 30. Don't volunteer longer terms.
- Offer 2/10 Net 30. A small early-pay discount converts a meaningful share of customers to payment in 10 days. The "cost" of the discount is almost always less than the cost of working capital.
- Automate reminders. Pre-due, due, +7, +14. Removes the awkwardness and makes it consistent.
- Frictionless payment. Card, ACH, bank transfer, instant-payment rail (Faster Payments / FedNow). Anything that makes the customer hunt for a way to pay you is a tax on your DSO.
When AR Gets Big Enough to Need Help
Past about $250K in AR or 100 active customers, a spreadsheet starts to break. Signals it's time for a real AR tool: invoices going out late, customers calling about invoices you didn't realise were issued, no clear monthly aging report, write-offs you didn't see coming. At that point a basic AR module in QuickBooks, Xero, FreshBooks, Wave, or a dedicated tool (Chaser, Upflow, GoCardless's invoice features) pays for itself in weeks.
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