Implied consent is permission to send commercial email inferred from an existing relationship between a business and a customer, such as a recent purchase, rather than an explicit action like checking a signup box.
The Weaker, More Conditional Form of Consent
Implied consent vs express consent, both referenced briefly under consent elsewhere in this glossary, deserves its own closer look because the two aren’t treated as equally valid across privacy law:
- Express consent is unambiguous: someone actively opted in through a clear, affirmative action, checking an unticked box, submitting a signup form.
- Implied consent is inferred rather than stated, based on the reasoning that a customer who just completed a purchase has implicitly signaled some willingness to hear from that business again.
Regulators generally treat implied consent as weaker footing than express consent, sufficient in narrower circumstances and often with conditions attached that express consent doesn’t carry.
Why Implied Consent Comes With an Expiration Date
Implied consent expiration is the detail that trips up more businesses than any other part of this concept:
- Under CASL, covered in detail elsewhere in this glossary, implied consent from a purchase typically lasts two years from that transaction unless renewed by a further interaction, after which continuing to email that contact on the basis of the original purchase is no longer valid.
- Under GDPR, implied consent is treated even more cautiously, generally requiring something closer to express consent for ongoing marketing regardless of a prior purchase relationship.
A business that captured implied consent correctly at the time of a sale but never tracked when that window closes can end up emailing contacts whose consent has technically lapsed, without any awareness that anything changed.
Implied Consent in Practice
Implied consent email marketing typically shows up around transactional relationships: a customer completes a purchase, and the business sends a small number of related marketing messages afterward without having captured a separate, explicit opt-in first.
This is workable in jurisdictions that recognize it, but it’s a narrower and more time-limited basis than express consent, which is why most of the consent-capture guidance elsewhere in this glossary defaults to recommending express consent as the safer standard, rather than relying on implied consent as the primary strategy.
Why This Distinction Is Worth Getting Right
Getting a clear answer to what is implied consent matters most for businesses operating across multiple regions, since the same customer purchase can carry different legal weight depending on where that customer is located.
A business relying entirely on implied consent from purchases might be perfectly compliant for customers in one jurisdiction while quietly exposed for customers in another, particularly once GDPR or CASL’s stricter standards apply.
Treating implied consent as a fallback rather than a foundation, and defaulting to express consent wherever practical, avoids having to track which legal standard applies to which specific contact based on their location.
Related terms:
Adflipr’s signup forms are built around capturing express consent directly, avoiding the tracking complexity and jurisdictional inconsistency that implied consent carries.
