diff --git a/.changeset/pos-device-fiscal-device-identifier.md b/.changeset/pos-device-fiscal-device-identifier.md
new file mode 100644
index 0000000000..df143c51ae
--- /dev/null
+++ b/.changeset/pos-device-fiscal-device-identifier.md
@@ -0,0 +1,5 @@
+---
+'@shopify/ui-extensions': minor
+---
+
+Add `fiscalDeviceIdentifier` to the POS Device API. `shopify.device.fiscalDeviceIdentifier` is the Shopify-assigned fiscal register identifier for the device (such as Sweden's manufacturing number), matching the `fiscalDeviceIdentifier` field on the `PointOfSaleDevice` object in the GraphQL Admin API. It's `undefined` when the device's location doesn't require fiscal device registration.
diff --git a/packages/ui-extensions/src/surfaces/point-of-sale/api/device-api/device-api.ts b/packages/ui-extensions/src/surfaces/point-of-sale/api/device-api/device-api.ts
index 7219339e3a..2dc3b7de7a 100644
--- a/packages/ui-extensions/src/surfaces/point-of-sale/api/device-api/device-api.ts
+++ b/packages/ui-extensions/src/surfaces/point-of-sale/api/device-api/device-api.ts
@@ -11,6 +11,10 @@ export interface DeviceApiContent {
    * A short, unique identifier for the device, assigned by Shopify.
    */
   registerName: string;
+  /**
+   * The Shopify-assigned fiscal register identifier for the device, such as Sweden's manufacturing number (tillverkningsnummer). It's the same value as the `fiscalDeviceIdentifier` field on `PointOfSaleDevice`.
+   */
+  fiscalDeviceIdentifier?: string;
   /**
    * Retrieves the unique string identifier for the device. Returns a promise that resolves to the device ID. Use for device-specific data storage, analytics tracking, or implementing device-based permissions and configurations.
    * Note: While Shopify POS attempts to maintain a stable identifier, it is not guaranteed to be permanent and may change.