diff --git a/src/actions/ebs-sync/ebs.js b/src/actions/ebs-sync/ebs.js
index 24ba124..f2f466b 100644
--- a/src/actions/ebs-sync/ebs.js
+++ b/src/actions/ebs-sync/ebs.js
@@ -798,13 +798,35 @@ function resolvePaymentTerms() {
   return 'Immediate';
 }
 
+/**
+ * True when an item's custom.categories include a 'Commercial' category.
+ * categories should be string[] | { name, url_key }[], but custom is
+ * untrusted, so we defensively guard the array, the entry types, and the
+ * property access before comparing.
+ */
+function hasCommercialCategory(item) {
+  const categories = item.custom?.categories;
+  if (!Array.isArray(categories)) return false;
+  return categories.some((category) => {
+    if (typeof category === 'string') {
+      return category.toLowerCase() === 'commercial';
+    }
+    if (category && typeof category === 'object') {
+      return typeof category.name === 'string'
+        && category.name.toLowerCase() === 'commercial';
+    }
+    return false;
+  });
+}
+
 /**
  * 'Commercial' when any item in the order is flagged as commercial
- * (item.custom.isCommercial === true), otherwise 'Household'.
+ * (item.custom.isCommercial === true) or belongs to a 'Commercial'
+ * category, otherwise 'Household'.
  */
 function resolveOrderType(order) {
   const hasCommercial = (order.items || []).some(
-    (item) => item.custom?.isCommercial === true,
+    (item) => item.custom?.isCommercial === true || hasCommercialCategory(item),
   );
   return hasCommercial ? 'Commercial' : 'Household';
 }
diff --git a/test/ebs-sync/ebs-e2e.test.js b/test/ebs-sync/ebs-e2e.test.js
index 29600cf..4c94739 100644
--- a/test/ebs-sync/ebs-e2e.test.js
+++ b/test/ebs-sync/ebs-e2e.test.js
@@ -758,6 +758,53 @@ describe('ebs-sync e2e', () => {
       await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, ccJournal);
       expect(capturedXml).toMatch(/Type="Commercial"/);
     });
+
+    test('string "Commercial" category produces Type="Commercial"', async () => {
+      const order = structuredClone(PP_BUNDLE_WARRANTY_ORDER);
+      order.items[0].custom = { categories: ['Kitchen', 'Commercial'] };
+      await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, journal);
+      expect(capturedXml).toMatch(/Type="Commercial"/);
+    });
+
+    test('object "Commercial" category (name/url_key) produces Type="Commercial"', async () => {
+      const order = structuredClone(PP_BUNDLE_WARRANTY_ORDER);
+      order.items[0].custom = {
+        categories: [
+          { name: 'Kitchen', url_key: 'kitchen' },
+          { name: 'Commercial', url_key: 'commercial' },
+        ],
+      };
+      await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, journal);
+      expect(capturedXml).toMatch(/Type="Commercial"/);
+    });
+
+    test('"Commercial" category match is case-insensitive', async () => {
+      const order = structuredClone(PP_BUNDLE_WARRANTY_ORDER);
+      order.items[0].custom = { categories: ['commercial'] };
+      order.items[1].custom = { categories: [{ name: 'COMMERCIAL', url_key: 'commercial' }] };
+      await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, journal);
+      expect(capturedXml).toMatch(/Type="Commercial"/);
+    });
+
+    test('non-commercial categories leave Type="Household"', async () => {
+      const order = structuredClone(PP_BUNDLE_WARRANTY_ORDER);
+      order.items[0].custom = {
+        categories: ['Kitchen', { name: 'Household', url_key: 'household' }],
+      };
+      await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, journal);
+      expect(capturedXml).toMatch(/Type="Household"/);
+    });
+
+    test('malformed categories are ignored and leave Type="Household"', async () => {
+      const order = structuredClone(PP_BUNDLE_WARRANTY_ORDER);
+      // categories not an array, plus null/non-object/missing-name entries
+      order.items[0].custom = { categories: 'Commercial' };
+      order.items[1].custom = {
+        categories: [null, 42, { url_key: 'commercial' }, {}],
+      };
+      await syncOrderToEbs(MOCK_CTX, MOCK_PARAMS, order, journal);
+      expect(capturedXml).toMatch(/Type="Household"/);
+    });
   });
 
   // ── Gift message ──────────────────────────────────────────────────────