diff --git a/.changeset/cash-rounding-transaction-complete.md b/.changeset/cash-rounding-transaction-complete.md
new file mode 100644
index 0000000000..25a308c722
--- /dev/null
+++ b/.changeset/cash-rounding-transaction-complete.md
@@ -0,0 +1,5 @@
+---
+'@shopify/ui-extensions': patch
+---
+
+Add optional `cashRoundingAdjustment` money data to POS transaction-complete payload types.
diff --git a/packages/ui-extensions/src/surfaces/point-of-sale/events/transaction-complete-event.ts b/packages/ui-extensions/src/surfaces/point-of-sale/events/transaction-complete-event.ts
index 25d17de671..aa0e3b7ea4 100644
--- a/packages/ui-extensions/src/surfaces/point-of-sale/events/transaction-complete-event.ts
+++ b/packages/ui-extensions/src/surfaces/point-of-sale/events/transaction-complete-event.ts
@@ -61,6 +61,10 @@ interface BaseTransactionCompleteEvent extends Event {
    * The tip amount added to this transaction as a `Money` object. This represents the gratuity the customer chose to add on top of the grand total, typically for service-based businesses or hospitality transactions. Tipping can be enabled through POS settings and may be added as a percentage or fixed amount. Returns `undefined` when no tip was added or when tipping is not enabled for the transaction.
    */
   readonly tipAmount?: Money;
+  /**
+   * The cash rounding adjustment applied to this transaction as a `Money` object. Returns `undefined` when no cash rounding adjustment was applied.
+   */
+  readonly cashRoundingAdjustment?: Money;
 }
 
 /**
diff --git a/packages/ui-extensions/src/surfaces/point-of-sale/types/base-transaction-complete.ts b/packages/ui-extensions/src/surfaces/point-of-sale/types/base-transaction-complete.ts
index 0e03cac569..66d08358c4 100644
--- a/packages/ui-extensions/src/surfaces/point-of-sale/types/base-transaction-complete.ts
+++ b/packages/ui-extensions/src/surfaces/point-of-sale/types/base-transaction-complete.ts
@@ -62,4 +62,8 @@ export interface BaseTransactionComplete {
    * The tip amount added to this transaction as a `Money` object. This represents the gratuity the customer chose to add on top of the grand total, typically for service-based businesses or hospitality transactions. Tipping can be enabled through POS settings and may be added as a percentage or fixed amount. Returns `undefined` when no tip was added or when tipping is not enabled for the transaction.
    */
   tipAmount?: Money;
+  /**
+   * The cash rounding adjustment applied to this transaction as a `Money` object. Returns `undefined` when no cash rounding adjustment was applied.
+   */
+  cashRoundingAdjustment?: Money;
 }