Big Cartel offers a Sales Tax Autopilot feature on all plans that automatically calculates and remits the correct sales tax rate for purchases made by customers in the United States. Sellers outside the US must set tax rates manually.

Big Cartel's pricing page confirms that Sales Tax Autopilot is included on all plans, including the free tier. Big Cartel's own help documentation names TaxJar as the integration it uses to automatically collect and remit US sales tax on orders shipping to the US and Puerto Rico when sellers transact in US dollars. The feature applies jurisdiction-specific tax rates automatically; Big Cartel does not describe it as AI-powered in its documentation, and it is best characterized as rule-based automation rather than machine-learning-based AI.