What this integration does — and what it deliberately does not
TaxJar can play two different roles in a commerce stack, and VeloCMS uses exactly one of them. Stripe Tax calculates and collects sales tax at the moment of checkout — that calculation never changes because TaxJar is connected. What the TaxJar connector does is report: after an order is completed, it sends the buyer's destination address, the order total, shipping, and the sales tax Stripe already collected to your TaxJar transaction list, so your sales-tax returns reflect real sales. If an order's tax amount is genuinely unknowable — for example a checkout that did not record it — VeloCMS skips filing that order rather than reporting a false zero, and flags it so you know it needs a manual look.