Dunning Email ROI Calculator
See exactly how much additional revenue a dunning email sequence can recover from your failed payments.
Dunning emails are automated messages sent to customers after a payment fails, prompting them to update their payment method. This calculator shows the revenue impact of improving your dunning email recovery rate. Since email sending costs are essentially zero when you use your own SMTP (like with Rezoki), the ROI is nearly infinite.
Your Numbers
Total number of payment failures per month.
Average dollar amount of each failed invoice.
What percentage of failed payments do your current emails recover? 0% if you have no dunning emails.
Expected recovery rate with an optimized email sequence. Good sequences achieve 35-50%.
Results
Monthly Revenue at Risk
$6,500
Current Monthly Recovery
$975
Target Monthly Recovery
$2,600
Additional Revenue/Month
$1,625
Annual Additional Revenue
$19,500
Email Sending Cost
$0
Formula
Additional Revenue = Failed Payments x Avg Invoice x (Target Rate - Current Rate)
The calculator multiplies the number of monthly failed payments by the average invoice value to get total revenue at risk. It then applies both your current and target recovery rates to find the gap — that gap is the additional revenue you would recover each month. Since Rezoki uses your own SMTP for sending (zero marginal cost), the net gain equals the gross gain. Annual projections simply multiply by 12.
How to Interpret Your Results
Under $500/mo additional
The absolute number is small, but dunning emails cost nothing to send. Free revenue is still worth capturing.
$500-$3,000/mo additional
This is real money. A well-crafted 4-email sequence could fund a significant portion of your tool stack.
$3,000-$15,000/mo additional
Your dunning emails could be recovering the equivalent of several new customers worth of revenue each month.
Over $15,000/mo additional
The revenue impact of optimized dunning is massive for your business. This warrants dedicated attention.
Industry Benchmarks
| Segment | Benchmark | Context |
|---|---|---|
| No dunning emails | 0-5% email recovery | Relying solely on payment retries. Customers never know their payment failed. |
| Single dunning email | 10-15% email recovery | One email helps but many customers miss it or procrastinate. |
| Multi-email sequence (3-5 emails) | 25-40% email recovery | A proper sequence with escalating urgency recovers significantly more. |
| Multi-channel (email + voice + in-app) | 50-70% total recovery | Adding voice calls and in-app notifications to email sequences maximizes recovery. |
How Rezoki Can Improve These Numbers
Rezoki is an AI-powered revenue recovery platform purpose-built for SaaS. It combines smart payment retries (timed for maximum approval rates), personalized dunning email sequences, and AI voice calls to recover failed payments before they become permanent churn.
- ✓Average 70% recovery rate across all customers
- ✓5-minute integration with Stripe — no engineering needed
- ✓Uses your own SMTP for zero-cost email delivery
- ✓AI voice calls for high-value invoices that need a personal touch
Related Tools
Failed Payment Revenue Loss Calculator
Calculate annual revenue lost to failed payments and how much is recoverable.
Revenue Recovery ROI Calculator
See the ROI of automated payment recovery for your SaaS.
Payment Retry Savings Calculator
See how smart payment retries recover more revenue than basic retries.
Involuntary Churn Cost Calculator
Find out how much involuntary churn from payment failures really costs.