August 24. If you sell across borders through Shopify, that is a date with consequences, not another notice in the dashboard.
Fact
The facts: on August 11 Shopify announced that Managed Markets is ending support for delivered duty unpaid in all markets where the delivered duty paid scheme works. The change takes effect on August 24, 2026. A merchant who takes no action switches automatically to payment at checkout. To keep payment on delivery, Managed Markets must be turned off before that date. The stated reason is predictable shopping without unexpected costs.
In plain terms: until now the customer saw a lower price on screen and then paid duties to the courier. From here on the whole bill sits at checkout.
The displayed price will look higher and somebody will panic about that. Do the other side of the arithmetic, though. A parcel returned because of a surprise at the door costs you the goods, the shipping both ways and the customer.
A surprise at the door is the most expensive way to lose a buyer.
Open the dashboard today and see where you stand. Until the 24th you decide. After that the setting decides.
Official primary sources
Shopify Changelog - Managed Markets is ending DDU supportThe visual is generated code-art, no third-party images.