The latest development update released by Composr CMS indicates that the team has started implementing more eCommerce oriented features. In future Composr CMS will have tax system support feature for online commerce in EU and the US. They have partnered with TaxCloud to implement the system to calculate sales tax for destination states.
The highlight of this feature is that when released, this is available as free addon for Composr CMS.
You can read about the development update at Composr official website.
Composr CMS is strengthening its eCommerce functionality