Is SMS marketing worth it for Shopify? Do this maths before you pay per text

Is SMS marketing worth it for Shopify? Here's the short answer, before the vendors get to you. Texting pays when it's automated and triggered by intent. It usually burns money when it's a daily blast to a small list.

That's not opinion. Klaviyo's 2026 SMS benchmarks, built on data from more than 183,000 customers, show SMS flows make up just 7.6% of sends but drive 45.2% of SMS revenue. Flow texts earn about 8× the revenue per recipient of campaign texts.

So the real question isn't “SMS, yes or no?” It's “which texts, to whom, at what cost per message?” Below are the tricks first, then the cost, the break-even formula and a 30-day test you can run.

6 tricks that decide whether SMS pays

1. Start with flows, not campaigns

Klaviyo's data puts the average SMS order rate at 1.9% for flows and just 0.27% for campaigns. Same channel, about seven times the conversion. Build abandoned cart, welcome and back-in-stock texts first. Campaigns come later, if ever.

2. Lead with the cart

Klaviyo's 2026 abandoned cart report found cart texts average $4.48 revenue per recipient and a 10.3% click rate, the highest revenue per recipient of any SMS flow. If one text earns its keep, it's this one. Our Klaviyo abandoned cart flow guide shows where to slot it.

3. Write for one segment

Carriers bill by segment. Klaviyo's character guide says one plain-text segment holds 160 characters, but a single emoji or special character switches the whole message to a format that holds 70, and only 67 per segment once it splits. Shopify's SMS billing page confirms a message split in two is charged as two. Cut the emoji, cut the bill.

4. Cap the frequency hard

Klaviyo's US compliance guide says more than 1–2 texts a day, or 4–5 a week, is likely too many and risks opt-outs. Texts feel personal. A brand that texts like a friend who won't stop gets blocked like one.

5. Build the list properly, from day one

Email consent is not SMS consent. Klaviyo is blunt: a phone number from checkout or an email form does not mean someone agreed to marketing texts. Add a clear SMS step to your pop-up and checkout. A list that's small but real beats a big one that gets you sued.

6. Use a holdout, not the dashboard

Attributed revenue is not extra revenue. Some texted buyers would have bought from an email anyway. Hold back a random 10–20% of new SMS subscribers for a month and compare their spend with the texted group. That gap is what SMS really adds.

What SMS actually costs a Shopify store

Four cost lines, and most people only budget the first one:

1. Per-message fees. Priced per segment, and they vary a lot by country and platform.
2. Automated message fees. Shopify's billing page lists charges for subscriber confirmations, double opt-in messages and replies to keywords like HELP and INFO.
3. Number fees. Shopify Messaging charges $2.15 a month per toll-free number for the US and Canada.
4. Your time. Copy, testing and compliance checks. Shopify's SMS analytics guide counts creative support in SMS cost too.

For scale, here is one published rate card, from Shopify Messaging as listed in October 2026. Klaviyo, Postscript and Attentive price differently, so check your own plan before you trust any number.

Notice the spread. A UK text costs five times a US one on this card. That alone can flip the answer. Model your own volume in the SMS pricing calculator.

The break-even formula

You don't need a vendor's case study. You need one number: how much revenue each text must bring in to cover its cost.

That ROI line is the basic version. For the profit and holdout versions that stop discounts from flattering the result, see my SMS marketing ROI formula breakdown.

The second line is the ROI formula from Shopify's SMS analytics guide. Use gross margin in the first, not revenue. A text that brings in $1 of sales on a 50% margin product only earns you $0.50.

What SMS earns: the 2026 benchmarks

From Klaviyo's 2026 SMS benchmarks (183,000+ customers):

Revenue per recipient by industry, same source:

For comparison, Klaviyo's 2026 email benchmarks put the average email campaign click rate at 1.69%. Texts get clicked. The question is always whether the click is worth the price.

One more number worth knowing: Klaviyo says 64.4% of SMS flow revenue comes from new buyers. Welcome and cart texts help turn visitors into first-time customers, not just nudge your regulars.

So, is SMS marketing worth it for Shopify stores? A quick checklist

Probably yes if:

• You already run solid email flows and want more from cart, welcome and reorder moments.
• You sell consumables or drops where timing matters (restocks, launches, limited runs).
• Most of your list is in a country with low per-message rates.
• You have steady traffic to grow an opted-in phone list.

Probably not yet if:

• Your email flows aren't built. Fix the cheaper channel first. Our guide to what share of revenue should come from email shows where you stand, and the email revenue calculator puts a number on it.
• You'd only send discount blasts. That trains people to wait for codes and opt out.
• Your margins are thin and most customers are in high-rate countries.
• Nobody owns compliance.

The compliance cost nobody budgets

This is where SMS can get expensive fast in the US. Klaviyo's compliance guide notes that TCPA lawsuits can seek $500 in statutory damages per violation, up to three times that for knowing or willful violations. Klaviyo says it can't give legal advice, so get your own counsel to review your setup. The basics it lists:

• Get express written consent (a form or keyword opt-in) with the required disclosures. Klaviyo recommends double opt-in.
• Give a clear opt-out (reply STOP) and honour requests from any channel quickly.
• Respect quiet hours. Federal rules block texts before 8 a.m. and after 9 p.m. in the recipient's time zone, and some states are stricter.
• Never text bought, borrowed or affiliate lists.

A 30-day SMS test plan

1. Week 1: add an SMS step to your sign-up form and checkout with proper consent. Turn on one abandoned cart text and one welcome text.
2. Week 2: add back-in-stock or a reorder text. For timing ideas, see our Klaviyo post-purchase flow examples.
3. Week 3: send one campaign to engaged SMS subscribers only. Keep it to one segment.
4. Week 4: compare revenue per recipient, opt-out rate and holdout spend against your break-even. Then decide: scale, fix or stop.

And if your Klaviyo bill is already climbing, read how to lower your Klaviyo bill before you add a second channel to it, and check your plan in the Klaviyo pricing calculator.

FAQ

Keep reading