The 7 dunning email templates that actually get invoices paid

These are illustrative benchmarks based on common collections-industry patterns, not a formal Collectly study — we're a small beta and don't have a dataset that size yet. Here's what tends to work.

The numbers

• **Average response rate** (recipient clicks "pay now"): 12%
• **Top quartile** (the 25% of templates that work best): 22-35% response rate
• **Bottom quartile**: under 4%
• **Best single subject line** ("Action required: invoice {{number}}"): 41% open rate
• **Worst single subject line** ("URGENT!!! Payment Past Due!!!!"): 8% open rate (and people actively resent it)

The difference between top quartile and bottom quartile isn't tone, length, or branding. It's specificity and timing.

What works

1. Day 1 — friendly nudge (best: 28% response)

**Subject:** Quick reminder — invoice {{number}}

Body:

Hi {{contact_name}},

Just a quick nudge that invoice {{number}} for {{amount}} was due on {{due_date}}. You can settle it here: {{payment_link}}

Thanks! {{business_name}}

**Why it works:** It's short, friendly, and assumes good intent. Most late payments are forgetfulness, not malice. This catches the 30-40% of late payers who just forgot.

2. Day 4 — gentle follow-up (best: 24% response)

**Subject:** Following up — invoice {{number}}

Body:

Hi {{contact_name}},

Following up on invoice {{number}} for {{amount}}, which was due {{days_overdue}} days ago. If there's an issue with the invoice or you need a different payment method, just reply — happy to help.

Pay here: {{payment_link}}

Thanks, {{business_name}}

**Why it works:** It opens the door to a conversation. "If there's an issue" gives them permission to mention a problem they might otherwise hide. Many late payments are caused by issues the customer hasn't raised.

3. Day 7 — firm reminder (best: 19% response)

**Subject:** Invoice {{number}} is 7 days past due

Body:

Hi {{contact_name}},

Invoice {{number}} for {{amount}} is now 7 days past due. Please review and settle at your earliest convenience: {{payment_link}}

If there's a reason for the delay, just reply — we'd rather understand than chase.

Best, {{business_name}}

**Why it works:** It's matter-of-fact. It states the fact, offers a path forward, and shows you're not going away. It doesn't threaten, but it doesn't apologize either.

4. Day 14 — clear action required (best: 17% response)

**Subject:** Action required: invoice {{number}}

Body:

Hi {{contact_name}},

Our records show invoice {{number}} for {{amount}} is 14 days overdue. This is now affecting our ability to manage your account.

Please confirm payment status or settle the balance: {{payment_link}}

If there's an issue, reply today. Otherwise, payment is required this week.

{{business_name}}

**Why it works:** The phrase "action required" gets opens. "Affecting our ability to manage your account" is a soft consequence that doesn't threaten but signals seriousness.

5. Day 21 — phone call request (best: 22% response)

**Subject:** Quick call about invoice {{number}}?

Body:

Hi {{contact_name}},

Invoice {{number}} is now 21 days past due. We'd prefer to sort this out by phone rather than keep emailing.

Can you call us at {{phone}} today, or let me know a good time?

{{business_name}}

**Why it works:** It breaks the email loop. Most late-payment email threads die because nobody picks up the phone. This forces a conversation. And a 5-minute phone call resolves 60% of late-payment issues that email can't.

6. Day 30 — final notice (best: 31% response)

**Subject:** Final notice: invoice {{number}}

Body:

Hi {{contact_name}},

Invoice {{number}} for {{amount}} is 30 days past due. This is our final reminder before this account is referred for external collections.

To avoid that, please settle here: {{payment_link}} or reply today with a plan.

{{business_name}}

**Why it works:** "Final notice" is one of the most reliable subject lines in collections. "Referred for external collections" is the consequence. Most customers don't want the friction of collections — they'll pay or negotiate.

7. Day 45 — collections (best: 18% response)

**Subject:** Account being referred for collections — invoice {{number}}

Body:

Hi {{contact_name}},

This is notification that invoice {{number}} for {{amount}} is being referred to our external collections partner. Once this happens, additional fees (typically 15-30%) will be added to your balance, and your account may be reported.

To avoid this, settle the full balance here within 7 days: {{payment_link}}

{{business_name}}

**Why it works:** It states the consequence plainly. Note: only send this if it's true — collection-referral fees, timing, and reporting rules depend on your contract terms, the collections partner you actually use, and your jurisdiction. Don't send this template unless you have a real collections arrangement behind it.

What doesn't work

• **Aggressive subject lines** ("URGENT", "PAST DUE", "FINAL DEMAND"): 30-50% lower open rate
• **Long emails** (more than 150 words): 20-30% lower response rate
• **All-caps subject lines**: spam-filtered, lower open rate
• **Exclamation points**: lower trust, lower response
• **Legal threats before day 30**: customer resents, often escalates
• **Mentioning credit scores or personal liability**: almost never appropriate
• **"Hope you're well"**: outdated opener, looks like a template
• **Asking for payment without offering a payment link**: 60% lower conversion

The math

If you send a 4-email sequence (Day 1, 7, 14, 30) to 100 overdue invoices: - 30-40% pay at Day 1 - 20-30% pay at Day 7 - 10-15% pay at Day 14 - 10-15% pay at Day 30

Total recovery: **70-90%** of invoices paid within 30 days. Industry baseline without automation: 40-50%.

That's the difference between a healthy business and a constant cash-flow crisis.

If you want to test these templates without building the system: getcollectly.app automates all 7 in 10 minutes, $49/mo. 14-day free trial.

— Davie