SMS Marketing 2026: What to Send, How Often, and the Compliance Rules You Can’t Skip

A founder called me last year, upset about her marketing bill. We opened the billing page together, live. Her store had sent 641,000 campaign emails and 21,000 campaign texts so far that year, and she was paying for 50,000 SMS credits a month, a $450 charge, with usage sitting at 0% for the month. Her first instinct was to turn SMS off. Then we looked at one text her brand had sent for Juneteenth. It had netted $5,200 on its own.

SMS is a lucrative channel that most brands run badly: on the wrong plan, from a separate tool, sent to everyone, about things nobody needed a text for. Run well, it earns a little more than email per message, gets about ten times the clicks, and carries more than its share of the busiest weeks of the year. Run badly, it loses subscribers twice as fast as email and costs money on every send.

This is my department’s playbook: what to send, how often, how to grow the list, and the federal and state compliance rules you can’t skip.

The short answer: treat SMS as a priority channel, not a second inbox. Build it into your flows first (welcome, abandoned cart and checkout, back in stock), then add a small number of high-value campaigns, and keep texts between noon and 8pm in the subscriber’s local time, which keeps you clear of state quiet-hour rules like Texas’s. Klaviyo’s 2026 benchmarks show flows producing 45.2% of SMS revenue from 7.6% of sends. Under the TCPA, marketing texts sent with an autodialer need prior express written consent (treat it as the rule for every marketing text), and Florida, Maryland and Texas add their own limits. The plan is at the end.

Per message, SMS earns a little more than email and gets about ten times the clicks

The most common thing I hear from a new client about SMS is one of two myths. Either “SMS massively outperforms email”, usually from a vendor, or “SMS will cannibalize my email”. Neither matches what we see. Comparing each store’s texts with its own emails, the median store earns 1.19 times as much per SMS recipient as per email recipient, gets 9.8 times the click rate and loses subscribers 2.2 times as fast.

Klaviyo’s 2025 benchmark report found the same near-tie on campaigns: $0.11 per SMS recipient against $0.10 per email recipient. So SMS isn’t a replacement for email. It’s meant to complement your email strategy. The edge is the click: it’s very hard for someone to ignore a text on their phone. The cost is that every send costs money, and every unwanted one loses a subscriber faster than an email would.

That’s why the stand-alone SMS tool is usually the first thing I’d consolidate. A beauty brand with about 15,000 SMS subscribers came to us running texts on a separate platform under a long contract. Because the SMS data never reached the email platform, every text went to everyone, and the owner had been told SMS always beats email. We introduced two-step email and SMS forms, then moved SMS into Klaviyo beside email, live on October 1, 2025. The SMS bill was cut almost in half. Over the holidays, SMS consistently got a higher click-through rate than email, and we increased total sending volume by 20% while deliverability dipped only about five points, a planned, managed dip.

Automated texts earn most of the money, so build SMS into your flows first

If you take one thing from this post, take this: the flows are where SMS pays. Klaviyo’s 2026 SMS benchmarks say flows are 7.6% of SMS sends and 45.2% of SMS revenue. Flow texts get a 9.65% click rate against 5.6% for campaigns, and a 1.9% placed-order rate against 0.27%.

Omnisend’s 2026 SMS report shows the same gap in dollars: $0.75 per automated text against $0.15 per campaign text. Postscript’s benchmarks, which mix campaigns and automations, put the median store at $0.98 per message, with the top tenth at $4.54 or more.

On Klaviyo, the build is simple because SMS steps live inside the same flows as your emails. A conditional split on SMS consent sends texters a text and everyone else an email. The flows where I add a text first:

• Welcome: the opt-in confirmation with the offer, then a message asking new subscribers to save your number as a contact.
• Abandoned checkout and cart: one text, usually as step two. Our abandoned cart email guide covers the timing.
• Back in stock and price drop: the shopper asked to be told, so a text is welcome.
• Replenishment and win-back: as the offer step. When my team tested a replenishment reminder by email against SMS, the text won on clicks and the email won on orders, so I use both: email first, text a few days later for anyone who hasn’t reordered.

138% Increase in SMS click rateLuxury Slipper Brand Grows Email Revenue by 10xSee the case study →=10 Automated email & SMS flows builtCompression Stocking Retailer Cuts Email Spam Complaints by 77%See the case study →

The four kinds of text that earn, and the ones that don’t

My unwritten rule is that SMS should only be used for communications with real value, because it’s such a personal channel. A text should make the subscriber think, “oh, I want to act on that right now. Thank you for texting me.” Four kinds of message pass that test:

1. Offers with a deadline. Sale starts and sale ends (the bookends of a promotion), and the last day to order for holiday delivery.
2. Launches and restocks. New products, limited drops and items coming back.
3. Personal triggers. The cart, the checkout, the replenishment reminder, the back-in-stock alert.
4. VIP and early access. First look for your best customers, which rewards them without a discount.

What doesn’t pass: blog content, newsletters by text, “happy holidays” with nothing to act on, and anything sent when you wouldn’t want to receive it. A client once wanted to text their list on Thanksgiving. I asked whether they’d want to receive a text on Thanksgiving, and they said no. So we sent an email instead, because you can ignore an email.

Keep the copy short. Attentive’s 2026 research found texts over 240 characters convert 8.5% worse, and it recommends 75 to 115. Plain text is cheaper, too: under Klaviyo’s legacy credit pricing a US MMS uses three credits to a plain text’s one, and a single segment holds 160 characters, or 70 with an emoji. Three examples:

• “[Brand]: Our spring sale starts now. 20% off everything through Sunday. Shop: [link] Reply STOP to opt out”
• “[Brand]: The [product] you asked about is back in stock. Grab yours before it sells out again: [link]”
• “[Brand]: Last day to order for delivery by Dec 24 with standard shipping. Shop gifts: [link]”

Name the brand in every text, include the opt-out language, and link to exactly one place.

How often to text: less than email, and concentrated where it counts

Klaviyo’s SMS best-practice guidance suggests one or two texts a week, and on the stores we manage the median store sends about five or six SMS campaigns a month. Opt-outs are the brake: a text loses subscribers about twice as fast as an email, so every extra send has to earn its place. Segment SMS the way you segment email. Even brands with sophisticated email segmentation often still batch and blast their SMS list, and it’s a huge mistake.

SMS is also the most seasonal channel we run. On a fixed set of stores we manage, 44.7% of the past year’s SMS campaign revenue (September 2025 to August 2026) came in the fourth quarter, against 33.8% for email campaigns.

Black Friday week is where SMS pulls its weight: our stores sent about 2.8 times their normal weekly texts and earned about 3.4 times their normal weekly SMS revenue. The industry saw the same thing at scale; Attentive reported nearly $2 billion in revenue from 5.7 billion messages over Cyber Week 2025. Save your texting budget for those moments.

Timing has a hard edge, too. Keep texts between noon and 8pm in the subscriber’s local time, which keeps you clear of state quiet-hour rules like Texas’s. Since Texas Senate Bill 140 took effect on September 1, 2025, the state treats marketing texts as telemarketing: no texts before 9am or after 9pm Monday through Saturday, or before noon on Sunday. Noon to 8pm sits inside that and the other rules below, and it matches when people actually want to hear from a brand.

Grow the SMS list from your email list first

The cheapest SMS subscribers you will ever get are the people already on your email list. On our stores, the best requests for SMS sent to existing email subscribers converted more than 20% of the people who saw them, and the median SMS sign-up form converted 5.8%. Use a two-step form on the site: email on step one, phone number on step two, one action per step, so a visitor can give one without the other. Then ask again inside the welcome flow, and build an SMS-only form for email subscribers who skipped step two the first time.

The most common mistake I see is collecting a phone number without text message consent. A number in a checkout field, or a “phone” box on a contact form, isn’t permission to text. The consent language has to be on the form, next to the field, and your platform has to record it.

Two more steps protect the list you build. Apple’s iOS 26 filter moves texts from unknown senders out of the main messages inbox, and Attentive’s 2025 lookback found filtered messages lost 30 to 40% of their clicks and conversions, so ask new subscribers to save your contact card. And watch the traffic it produces: across the SmartSites client roster, GA4 sessions from SMS rose 39% year over year in May to August 2026, and 80% among ecommerce stores, while email sessions fell.

SMS compliance in 2026: consent is the rule that matters most

The biggest compliance risk in SMS is the lack of proper consent, not registration. I tell my team that consent has to be explicit, never inferred, recorded with a digital timestamp, and it can’t be shared across brands: if a client rebrands or opens a new company, the SMS subscribers don’t move with them. A medical prospect we spoke with had collected thousands of numbers through a form that didn’t link to a privacy policy, and none of them were usable. Here is what the federal rules say, as of September 2026. This is a marketer’s summary, not legal advice; check your program with counsel.

• Prior express written consent. Under the FCC’s TCPA rules (47 CFR 64.1200), marketing texts sent with an autodialer need prior express written consent: a signed agreement, and an electronic signature counts, that clearly authorizes marketing messages to that number. The disclosure must say that agreeing is not a condition of purchase. Courts have narrowed what counts as an autodialer, but state laws reach further and every reputable SMS platform requires written consent anyway, so treat it as the rule for every marketing text.
• Penalties. The TCPA lets recipients sue for $500 per message, up to $1,500 when the violation is willful or knowing, which is why class actions over texts are common.
• Quiet hours. The federal rule bars telephone solicitations before 8am or after 9pm at the recipient’s location, and the FCC applies its do-not-call rules to texts sent to mobile numbers. Klaviyo’s own best-practice guidance is stricter: nothing before 9am or after 8pm.
• Opt-outs. Since April 11, 2025, a person can revoke consent by any reasonable means, including replying STOP or similar words, and you must honor it within ten business days. The FCC has delayed its broader “revoke all” provision to January 31, 2027, and in September 2026 it put a proposed revision on the agenda for its September 30 meeting that would let senders designate the opt-out methods they accept. As of this writing that revision is a proposal, not an adopted rule, and under the draft one opt-out from marketing messages would still cover all of a sender’s marketing texts. Process STOP immediately and you are covered either way.
• Carrier rules. Mobile carriers require business texting from local numbers to be registered (A2P 10DLC) and toll-free numbers to be verified, and unregistered traffic is blocked. They also restrict content: my team works from the SHAFT list (sex, hate, alcohol, firearms and tobacco) and checks before promoting anything near it.

If you have only ever texted through Klaviyo, you already meet much of this by default, because Klaviyo does not let you switch off its consent collection. The one thing I’d double-check is the quiet-hours setting in your account.

State rules: Florida, Maryland and Texas set the tighter limits

Several states have their own telemarketing laws, often called mini-TCPAs, and they apply based on where your subscriber lives, not where your business is. Three matter most for ecommerce senders right now:

• Florida. The Florida Telephone Solicitation Act (section 501.059 of the Florida Statutes) requires prior express written consent for automated sales calls and texts and lets recipients sue for $500 per violation, tripled if willful. Before suing over texts, a recipient must reply STOP, and the sender has 15 days to stop. A separate section (501.616) bars commercial solicitation calls before 8am or after 8pm and more than three in 24 hours on the same subject. That window is written for calls; texts are treated the same way by most senders, and a noon-to-8pm window sits inside it either way.
• Maryland. The Stop the Spam Calls Act of 2023, in force since January 1, 2024, applies to telephone solicitations by call, text message or voicemail. It requires prior express written consent for automated solicitations and bars them between 8pm and 8am in the recipient’s time zone, and more than three times in 24 hours on the same subject.
• Texas. Senate Bill 140 took effect on September 1, 2025 and brought text messages into the state’s telephone-solicitation law (chapter 302 of the Business and Commerce Code), which requires registration with the Texas Secretary of State. After a federal lawsuit by ecommerce groups was dismissed in November 2025, the Secretary of State’s guidance now says businesses sending texts with prior consumer consent don’t need to register. That guidance isn’t binding precedent, and private claims over texts sent without consent continue, so documented consent is your protection. Texas law separately limits telephone solicitations to 9am to 9pm, and noon to 9pm on Sundays. I covered the Texas change in detail in our post on the Texas SMS rules.

Put the federal and state rules together and a simple standard covers all of them: documented written consent with a timestamp, one marketing text a day at most, nothing before noon or after 8pm in the subscriber’s time zone, and opt-outs processed immediately. That’s the standard my team runs for every client.

The SMS marketing plan for 2026, in order

1. Audit consent first. Check every form that collects phone numbers for SMS consent language and a privacy-policy link, and confirm your platform records the timestamp.
2. Consolidate SMS with email. One platform, one customer profile, one set of segments.
3. Check your plan and credits. Match the credit tier to what you actually send, and prefer plain text to MMS unless the image earns its cost.
4. Build SMS into your flows. Welcome, abandoned checkout and cart, back in stock, then replenishment and win-back offers.
5. Grow the list from your email subscribers. Two-step forms, an SMS request inside the welcome flow and an SMS-only form for email subscribers.
6. Set a safe send window. Noon to 8pm in the subscriber’s local time keeps you clear of state quiet hours like Texas’s. One marketing text a day at most.
7. Send fewer, better campaigns. Deadlines, launches, restocks and VIP access, segmented like your email, with most of the budget saved for Q4.
8. Report SMS on revenue per recipient and opt-outs. Next to email, without double-counting the sales both channels claim.

If you’re paying for an SMS tool you barely use, start with step three this week; it took the founder and me a few minutes on her billing page to find the problem. If you’d like my team to set up or consolidate SMS alongside your email, that’s what our SMS marketing service does, and as Klaviyo experts we build the flows it runs on. Want a second set of eyes on your current setup first? Our email and SMS team offers a free account audit. We’ll look at your flows, campaigns, list growth and deliverability, and show you where the biggest revenue opportunity is.

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