SMS Compliance and GDPR for Shopify Store Owners: What You Must Know

SMS marketing is one of the highest-performing channels available to Shopify stores — but it is also one of the most heavily regulated. Text message marketing carries the potential for significant legal liability if done incorrectly, with fines ranging from $500 to $1,500 per message in the United States under the Telephone Consumer Protection Act (TCPA) to multi-million pound penalties under GDPR in the UK and EU. Understanding the compliance landscape before you launch is not optional — it is foundational to running a sustainable SMS programme.

This guide covers the key regulations you need to know: TCPA in the US, GDPR across the EU and UK, PECR in the UK specifically, and CASL in Canada. It also covers the practical implementation steps your Shopify SMS setup must include to remain compliant across all markets where you have customers.

TCPA Compliance: US Rules for Shopify SMS Marketing

The Telephone Consumer Protection Act is the primary US law governing SMS marketing. Originally passed in 1991 and significantly updated since, the TCPA’s core requirements for marketing SMS are: express written consent before sending any marketing text message, a clear and conspicuous disclosure that the consumer is agreeing to receive marketing texts, an easy opt-out mechanism that must be honoured within a reasonable timeframe, identification of the sender in every message, and restrictions on sending hours (no messages before 8am or after 9pm in the recipient’s local time zone).

Express written consent under TCPA does not require a physical signature — it includes clicking a checkbox, replying to a keyword campaign, or submitting a form specifically requesting to receive SMS. What it does require is that the consent language clearly describes what the subscriber is agreeing to: your brand name, the type of messages they will receive (marketing, promotions, alerts), and the approximate frequency of messages.

The TCPA provides a private right of action — meaning individual consumers can sue you directly for violations, not just the FCC. Class action lawsuits under the TCPA are common and expensive. A single poorly documented consent process or improperly handled opt-out can expose your business to class action risk even if only a small number of messages were sent non-compliantly. This is why working with reputable SMS platforms that maintain detailed consent records is so important — documentation is your defence.

GDPR Compliance for EU Shopify Stores

The General Data Protection Regulation applies to any Shopify store that markets to EU residents, regardless of where the store itself is based. If you have customers in Germany, France, the Netherlands, or any other EU member state, GDPR applies to your SMS marketing activities.

Under GDPR, SMS marketing requires a lawful basis for processing personal data (phone numbers). For direct marketing purposes, the appropriate lawful basis is consent — and GDPR consent requirements are stricter than TCPA. GDPR requires that consent be freely given, specific, informed, and unambiguous. This means: no pre-ticked boxes, no bundled consent (separate consent for email and SMS), clear language about what they are consenting to, and a record of the consent including when it was given and what information was presented.

GDPR also gives EU residents the right to withdraw consent at any time and the right to erasure (“right to be forgotten”). Your SMS programme must have a process for honouring erasure requests — not just suppressing the contact from future sends, but actually deleting their personal data from your SMS platform and any other systems where it is stored. Most major SMS platforms provide GDPR data deletion tools for this purpose.

PECR: UK-Specific Rules Post-Brexit

Since Brexit, the UK’s Privacy and Electronic Communications Regulations (PECR) operate independently from EU GDPR, though they are substantively similar. PECR governs electronic marketing communications including SMS and requires explicit opt-in consent for marketing texts to individual consumers.

One notable area where UK rules differ from EU GDPR is the “soft opt-in” provision. Under PECR, if you have obtained a customer’s phone number in the course of a sale and the customer did not opt out of marketing at the time of purchase, you may be able to market to them by SMS for similar products or services — without a fresh explicit consent — provided you gave them a clear opportunity to opt out at the time of purchase and in every subsequent message. This soft opt-in provision does not exist under GDPR and is UK-specific.

However, the safest and most scalable approach for most Shopify stores is to treat UK customers with the same explicit consent requirement as EU customers, rather than attempting to rely on the soft opt-in provision. Platform compliance tools are built around explicit consent, list management is simpler, and you avoid the grey areas that can arise when the soft opt-in conditions are not perfectly met.

Practical Compliance Checklist for Your Shopify SMS Programme

• Every opt-in point clearly states your brand name and what subscribers will receive
• Consent is never pre-ticked, bundled, or buried in terms of service
• Your SMS platform records a timestamp, source, and consent language version for every subscriber
• STOP opt-outs are processed immediately (within seconds, not hours)
• A clear opt-out instruction (“Reply STOP to unsubscribe”) appears in every marketing message
• Messages are only sent between 8am and 9pm in the recipient’s local time zone
• Every message identifies your brand name clearly
• You have a documented data retention and deletion policy for phone numbers
• Your privacy policy accurately describes your SMS marketing practices and data use
• You have separate consent records for email and SMS marketing

CASL: Canadian Shopify Compliance

Canada’s Anti-Spam Legislation (CASL) applies to commercial electronic messages, including SMS, sent to or from Canadian devices. CASL requires express or implied consent, clear identification of the sender, and an easy unsubscribe mechanism. The implied consent provision under CASL (which allows marketing to existing customers within two years of their last purchase) is similar to PECR’s soft opt-in and can be used carefully for Canadian subscribers — but again, explicit consent is the cleaner and more defensible approach for most stores.

Choosing a Compliant SMS Platform

Your SMS platform is your compliance partner. The best platforms — Postscript, Attentive, SMSBump, Klaviyo SMS — are built with compliance as a foundational feature, not an afterthought. They maintain consent records, process STOP requests automatically and immediately, enforce sending hour restrictions, and provide tools for GDPR data deletion requests. They are also registered with The Campaign Registry (for US 10DLC) and maintain good sender reputations with carriers, which directly impacts deliverability.

When evaluating platforms, specifically ask: how do you record and store consent? What is your process for handling GDPR erasure requests? How quickly are STOP opt-outs processed? Can you generate a compliance report showing consent timestamps and opt-in sources for all subscribers? A reputable platform will answer all of these questions confidently and specifically.

A Note on Compliance as a Competitive Advantage

Compliance is not just a legal obligation — it is a quality signal. A well-managed, consent-based SMS list of 5,000 subscribers is worth more than a purchased or poorly consented list of 50,000. Carriers score sender reputations based on complaint rates, opt-out rates, and message quality. Stores that treat compliance seriously have higher deliverability, better engagement rates, and lower per-subscriber costs over time. Compliance is how you build a sustainable SMS programme, not just a legal programme.

If you need help ensuring your Shopify SMS programme is fully compliant across all the markets you serve, the team at Oneonic can review your current setup and identify any compliance gaps. Contact us for a compliance review, or explore our broader ecommerce marketing services. You can also see how we have helped other Shopify brands build compliant, high-performing SMS programmes in our client portfolio.