---
title: "Dunning SMS — Retention Growth Tactic"
description: "Add SMS to the dunning sequence—a failed payment is time-boxed, and a text reaches the subscriber inside the window in a way email increasingly does not, with the gap widest at consumer membership orgs."
canonical: "https://churnkey.co/growth/library/dunning-sms"
category: "growth"
related:
  - /growth/library/index.html.md
  - /growth/library/methodology.html.md
  - /feature/payment-recovery/dunning-campaigns/index.html.md
last_updated: "2026-06-09"
---

# Dunning SMS

Add SMS to the dunning sequence—a failed payment is time-boxed, and a text reaches the subscriber inside the window in a way email increasingly does not, with the gap widest at consumer membership orgs.

- **Stage:** Retention
- **Evidence grade:** strong (large, consistent correlation)
- **Evidence:** SMS-plus-email recovery outperforms email-only, widest at consumer membership orgs
- **Trigger type:** Scheduled
- **Channels:** SMS, email

## What is it?

A failed payment is a race against the clock: the retry schedule runs out, the grace period closes, and the subscription cancels whether or not the subscriber ever saw the message. Email is the default channel for that message, and email is increasingly the channel the subscriber checks last. SMS puts the recovery notice on the device the subscriber actually looks at, inside the window that matters.

The tactic slots one or two text messages into the existing dunning schedule, each carrying the same no-login payment link the emails carry. It matters most for consumer membership subscriptions, where email open rates lag and the relationship already lives on the phone—the subscriber signed up there, uses the product there, and fixes the card there.

## What the evidence shows

Recovery campaigns that pair SMS with email outperform email-only sequences across the platform. The lift is consistent in direction, and it is widest at consumer membership orgs—the audiences whose inboxes are most crowded and whose phones are most present.

The channel-isolated effect varies by audience, which is the honest caveat: a B2B org whose subscribers live in email will see less from SMS than a fitness membership whose subscribers have not opened a marketing email in months. The sequence-level outcome, not the per-message open rate, is the number to watch.

## How it runs

SMS messages are scheduled steps in the dunning campaign, placed alongside the email steps rather than replacing them. Each text states the failure plainly and carries the no-login payment link, so the fix is one tap from the lock screen.

Consent is the gate. SMS only goes to subscribers who opted in at signup or checkout, message volume is capped per failure episode, and sends respect quiet hours in the subscriber’s timezone. The channel earns its lift by being present, not by being loud.

## Run it with the Churnkey MCP

This tactic runs via the Churnkey MCP. Connect it to your favorite AI agent and it reads your own usage and billing data, then recommends and runs the plays most likely to move your LTV — starting with whether this one fits.

**Trigger:** A scheduled dunning step fires for a subscriber with an open failed-payment episode and valid SMS consent on file.

**Surface:** SMS messages interleaved with the email steps of the dunning sequence, each carrying the no-login payment link.

**Guardrails:**

- Consent: SMS only to subscribers who have opted in to receive messages—verify the consent requirements that apply in your jurisdiction before enabling the channel.
- Volume: cap message count per failure episode (at most two SMS), so the channel never becomes the reason a subscriber leaves.
- Actionability: every SMS carries the no-login payment link and an opt-out—no message that informs without offering the fix.
- Timing: respect quiet hours in the subscriber’s timezone; a 3am dunning text recovers nothing and burns the channel.

**Evidence:** Recovery campaigns that pair SMS with email outperform email-only sequences, with the gap widest at consumer membership orgs. The multichannel lift is consistent in direction across orgs running multichannel dunning; the channel-isolated effect varies by audience.

**How to run it:**

1. Capture SMS consent at signup or checkout and store it as a hard precondition on the channel.
2. Add one to two SMS steps to the dunning schedule, placed where email engagement historically drops off.
3. Compose each message around the no-login payment link, with the failure stated plainly and an opt-out included.
4. Gate sends on quiet hours in the subscriber’s timezone and on the per-episode message cap.
5. Measure sequence-level recovery rate against the email-only baseline, segmented by audience type, and keep SMS only where it earns its lift.

Install the MCP server:

```bash
npm install -g @churnkey/mcp
```

The full reference is in the [Churnkey MCP docs](https://docs.churnkey.co/data-integrations/mcp).

## Related

- [Growth Tactics Library](/growth/library/index.html.md) — The full register of graded growth plays.
- [How Tactics Are Graded](/growth/library/methodology.html.md) — The four-grade evidence ladder behind this grade.
- [Dunning Campaigns](/feature/payment-recovery/dunning-campaigns/index.html.md) — The Churnkey feature this tactic maps to in production.