How to Collect Accounts Receivable: A Step-by-Step AR Collection System

Accounts receivable (AR) collection is the process of recovering money owed to your business for work already delivered or goods already sold. When you raise an invoice, the amount immediately becomes an account receivable — an asset on your books. AR collection is the work of converting that asset into actual cash in your account.

AR collection is distinct from invoicing. Invoicing is creating and sending the invoice. AR collection is everything that happens afterward when the invoice is not paid by the due date. It includes reminders, follow-up calls, formal notices, dispute resolution, late fee enforcement, and — when all else fails — referral to collections or legal action.

For most small businesses and freelancers, AR collection is reactive and inconsistent. An invoice goes past due, they remember to send a chaser a few weeks later, maybe a second one after that, and then the invoice quietly ages toward uncollectable status. The problem is not bad luck or bad clients — it is the absence of a system.

A structured AR collection process — with defined stages, timing, and escalation triggers — typically improves collection rates by 10–20 percentage points over informal ad hoc follow-up. For a business with £50,000 in annual receivables, that is £5,000–£10,000 in recovered revenue.

See also: how to prioritize which overdue invoices to chase first for the complementary guide on AR prioritization.

Effective AR collection moves through five stages, each with a distinct tone, timing, and action. The key discipline is advancing through stages on schedule — not staying in stage 1 indefinitely because confrontation feels uncomfortable.

When you have multiple overdue invoices, you need a system for deciding which to chase first. The most effective approach is a two-factor priority score: invoice amount multiplied by days overdue. The highest scores demand the most immediate attention.

Below is a collection priority matrix showing how invoice age and amount combine into a priority tier. Use this to triage your outstanding AR at your weekly review.

COLLECTION PRIORITY MATRIX
Invoice Amount × Days Overdue → Priority Tier

                  1–15 days    16–30 days   31–60 days   60+ days
                  overdue      overdue      overdue      overdue
─────────────────────────────────────────────────────────────────
Over £10,000   │  MEDIUM   │  HIGH      │  URGENT    │  CRITICAL
£2,000–£9,999  │  LOW      │  MEDIUM    │  HIGH      │  URGENT
£500–£1,999    │  LOW      │  LOW       │  MEDIUM    │  HIGH
Under £500     │  MONITOR  │  LOW       │  LOW       │  MEDIUM
─────────────────────────────────────────────────────────────────

CRITICAL  → Escalate now. Consider formal notice + legal consult.
URGENT    → Formal notice sent. Demand specific payment date.
HIGH      → Firm follow-up. Reference late fees. Set deadline.
MEDIUM    → Second reminder. Shift tone to firm.
LOW       → Friendly reminder. Assume admin delay.
MONITOR   → Note in system. One gentle nudge.

This matrix is a starting point. Adjust thresholds for your business: a freelance designer working with individual clients may treat a £500 invoice at 60 days differently than an agency with a net-30 corporate client.

For a fully calculated view of your outstanding AR grouped by aging bucket, use the AR aging report tool. It shows your total exposure at each risk level and which invoices need action this week.

1. 1. Set clear payment terms before work begins. Net 30 is standard, but Net 14 or Net 7 is appropriate for smaller projects or new clients. Include payment terms in your contract, on your invoice, and in your project kick-off communication. Clients who agreed to specific terms are significantly easier to collect from than those operating on vague expectations.

2. 2. Invoice immediately upon delivery. The faster you invoice, the faster your payment clock starts. Businesses that batch invoices monthly or delay invoicing until reminded typically have DSOs 15–25 days higher than businesses that invoice on the day of delivery.

3. 3. Follow up on schedule, not on impulse. Set your reminder cadence and stick to it — regardless of how you feel about the client or how busy you are. Ad hoc follow-up produces ad hoc results. A consistent cadence signals professionalism and makes non-payment more awkward for the client, not less.

4. 4. Always ask for a specific payment date. “When can you pay?” invites indefinite delay. “Can you confirm payment by [date]?” forces a commitment. If they miss the committed date, you have additional grounds for escalation.

5. 5. Apply late fees consistently. A late fee policy that is never enforced teaches clients your terms are optional. Apply late fees at the threshold stated in your contract, calculate the exact amount, and include it in your formal notice. Credit them only in exceptional circumstances, and document every exception.

6. 6. Keep a contact log for every invoice. Record every email sent, every call made, every client response, and every payment promise. This log is your evidence trail if the matter escalates to legal action. It also prevents the embarrassing situation of chasing a client who already paid but whose payment has not yet been reconciled in your records.

7. 7. Do not let collection drag past 90 days. After 90 days, recovery rates drop sharply. If your internal process has not worked in three months, escalate — even if you feel awkward about it. An invoice that reaches 120 days with no action is very likely to become a write-off.

You cannot improve what you do not measure. These four metrics tell you whether your AR collection process is working — and where it is breaking down.

Escalation is not failure — it is the appropriate next step when internal collection has been exhausted. Knowing when and how to escalate is part of having a complete AR collection system.

A repeatable AR collection system has four components working together: a defined follow-up cadence, a prioritization method, a tracking tool, and escalation triggers.