diff --git a/test/intl402/NumberFormat/prototype/toStringTag/initial-value.js b/test/intl402/NumberFormat/prototype/toStringTag/initial-value.js
new file mode 100644
index 0000000000000000000000000000000000000000..71a99695a498426bbc6f7f435215b049fa5ecccd
--- /dev/null
+++ b/test/intl402/NumberFormat/prototype/toStringTag/initial-value.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2018 Ujjwal Sharma. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.numberformat.prototype-@@tostringtag
+description: >
+  Initial value of Intl.NumberFormat.prototype[@@toStringTag] is "Object".
+---*/
+
+assert.sameValue(Intl.NumberFormat.prototype[Symbol.toStringTag], 'Object');
+assert.sameValue(
+  Object.prototype.toString.call(new Intl.NumberFormat()),
+  '[object Object]'
+);
diff --git a/test/intl402/NumberFormat/prototype/toStringTag/prop-desc.js b/test/intl402/NumberFormat/prototype/toStringTag/prop-desc.js
new file mode 100644
index 0000000000000000000000000000000000000000..fdba7a30eb7aca94db99ea7f80a1fcd4151474f9
--- /dev/null
+++ b/test/intl402/NumberFormat/prototype/toStringTag/prop-desc.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2018 Ujjwal Sharma. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.numberformat.prototype-@@tostringtag
+description: >
+  Tests that Intl.NumberFormat.prototype[@@toStringTag] has the required attributes.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(Intl.NumberFormat, Symbol.toStringTag, {
+  writable: false,
+  enumerable: false,
+  configurable: true
+});