A computer-implemented method for encouraging the renewal of security-software subscriptions may comprise: 1) determining that a security-software subscription for a computing system has expired, 2) after determining that the security-software subscription has expired, continuing to at least periodically retrieve vendor-supplied security updates and to monitor the computing system for potential security threats, 3) detecting at least one security threat to the computing system, 4) notifying a user of the computing system of the security threat, and then 5) prompting the user to renew the security-software subscription. Corresponding systems and computer-readable media are also disclosed.