Why most SMB collections are broken.
Two failure modes dominate. The first is silence: the invoice goes out, the customer does not pay, nothing happens for 45 days, then the owner makes an angry phone call. The customer is offended (they were going to pay) and either pays slowly out of resentment or churns. The second failure mode is over-personal: a single AR person sends every reminder manually, so the cadence is inconsistent and politeness varies with their mood.
The fix is automation with a tone ladder. The system sends predictable, on-cadence reminders that escalate gradually in firmness. The human only steps in for the genuinely difficult cases. Customers prefer this because it is predictable and impersonal in the early stages, which removes the social awkwardness.
The 5-stage tone ladder.
Stage 1 at +1 day past due: friendly nudge. "Just a reminder, invoice X is now due. Click here to pay." Tone: helpful. Stage 2 at +7 days: gentle reminder with a copy of the invoice. "We noticed invoice X is 7 days overdue. Please let us know if there is an issue." Tone: concerned but warm. Stage 3 at +21 days: firmer. "Invoice X is now 3 weeks overdue and is impacting our cash flow. Please prioritize." Tone: factual, slightly firm.
Stage 4 at +45 days: serious. "Invoice X is significantly overdue. We need payment within 7 days to avoid escalation." Tone: serious, clear consequence. Stage 5 at +60 days: final notice with manager involvement and stop-supply trigger. "Account on hold pending payment. Please contact our finance manager." Tone: formal, action-required. Beyond stage 5, the case moves to manual handling: legal letter, write-off decision, or relationship reset conversation.
- Stage 1 (+1 day): friendly nudge
- Stage 2 (+7 days): gentle reminder with invoice
- Stage 3 (+21 days): firmer, mention cash flow impact
- Stage 4 (+45 days): serious, 7-day deadline
- Stage 5 (+60 days): formal hold, manager contact
Channel mix: WhatsApp, email, SMS, phone.
Channels vary by market. In LATAM, India, much of southern Europe, and the Middle East, WhatsApp is the dominant business channel and read rates are very high. In the US and most of UK B2B, email remains the formal channel of record. SMS works well in Australia and parts of Europe for short notifications. Phone calls cross all markets but are reserved for escalation. Use email for stage 1 (formal record), WhatsApp / SMS for stages 2 and 3 (read receipts and reply-friendly in markets where they dominate), and phone for stages 4 and 5 (escalation requires voice). The combination has materially better collection rates than email-only in every market we have tested.
Worked example. A Sydney-based B2B distributor with A$5.8M annual revenue. Pre-automation, average days-sales-outstanding was 64 days. After 4 months on a WhatsApp + email + SMS tone ladder via Nonari dunning automation, DSO dropped to 41 days. The A$340,000 cash freed up paid for two new sales hires and a delivery van.
When to override the automation.
The system should let you suppress dunning for specific customers. Common cases: the customer is in a confirmed payment plan, there is a disputed line item under review, or the customer is a strategic account where the owner wants to handle directly. Suppression should be time-bounded (auto-resume after 30 days unless renewed) and logged in the audit trail.
The override discipline matters. SMBs that suppress too easily end up back where they started. A useful rule: only the AR lead and the owner can suppress, suppression requires a reason note, and suppressions are reviewed monthly. Most stay-the-course customers should be on the automation, full stop.
Tone matters more than frequency.
A common mistake is to make every reminder identical except for "this is now X days overdue." Customers stop reading after the second one. The tone ladder works because each stage has a different message, frame, and call to action. Stage 1 is a nudge, stage 3 names the impact on you, stage 5 is a clear consequence. Each one earns a re-read because it is genuinely different.
A second tone principle: never threaten what you will not do. If stage 4 says "we will stop supply," then stop supply when stage 5 hits. Customers who learn that your warnings are empty stop responding to them. A clean reputation for following through is the most valuable asset in collections.
How Nonari automates this.
AR aging buckets feed the trigger engine. Every overnight batch checks which customers are at +1, +7, +21, +45, +60 days. Templates per stage are pre-written and customizable. WhatsApp Business API integration sends messages automatically in WhatsApp-dominant markets; SMS goes through Twilio or local SMS providers; email goes via SMTP. Replies route to the AR inbox for human handling. Suppression is one click with a reason field. The audit log records every send.
The owner sees a single dashboard: open AR by aging bucket, dunning activity by stage, and customer-level history of every reminder. The AR lead sees the queue of replies and exception cases. Most days nobody needs to do anything. The system runs.