The baseline: what most service businesses spend on manual collections
Before calculating ROI, establish the baseline cost of manual collections. For most small service businesses, this includes: 2-5 hours per week of office manager or owner time making calls and sending follow-up emails, a 2-4% bad debt rate (invoices that never get collected and eventually get written off), and the opportunity cost of cash that's sitting in AR instead of in the bank earning interest or funding growth.
For a business doing $1M annually with a 3% bad debt rate, the write-offs alone are $30,000 per year. Add 150 hours per year of manual follow-up time at $30/hour, and the total cost of manual collections is $34,500 annually — before factoring in the cash flow cost of slow payment.
The automation ROI calculation
An automated collection system with Surety costs 12% of what Remi collects (free to start), or flat $149/month after 10 customers. For a business collecting $10,000/month in AR that would otherwise be uncollected, the fee at 12% is $1,200/month. But if the alternative is writing it off, the net recovery is $8,800/month — and you've saved the staff time as well.
More realistically: a business doing $100K/month in invoices with a 5% overdue rate has $5,000/month in at-risk AR. If automation recovers 80% of that (vs. 50% manually), the incremental recovery is $1,500/month. At $149/month flat fee, that's a 10x ROI.
How to measure your actual ROI
The most honest way to measure AR automation ROI is through A/B comparison. Surety's attribution dashboard does this automatically: it tracks payment velocity for invoices where Remi made contact vs. invoices where no contact was made. The gap between those two groups is the automation's causal contribution — not a correlation, but a direct comparison.
Most Surety customers see called invoices resolving 15-25 days faster than uncalled invoices on identical aging. For a business with 30-day average payment cycle, cutting 20 days off the cycle on 20% of invoices represents a real, measurable improvement in working capital.
What automation cannot fix
AR automation accelerates collection of invoices that customers intend to pay eventually. It cannot collect from customers who have genuinely decided not to pay, who dispute the work, or who have no ability to pay. For those situations, legal escalation or write-off is the right path.
The realistic expectation for automation: it resolves 70-85% of the invoices that fall into the 'would pay eventually if followed up' bucket faster and at lower cost than manual follow-up. The other 15-30% require human judgment — either escalation or write-off. Automation handles the easy cases so you can focus on the hard ones.