diff --git a/src/multisafepay/api/shared/cart/cart_item.py b/src/multisafepay/api/shared/cart/cart_item.py
index 0d4984e..5c926ed 100644
--- a/src/multisafepay/api/shared/cart/cart_item.py
+++ b/src/multisafepay/api/shared/cart/cart_item.py
@@ -248,7 +248,7 @@ def add_weight(self: "CartItem", weight: Weight) -> "CartItem":
 
     def add_tax_rate_percentage(
         self: "CartItem",
-        tax_rate_percentage: float,
+        tax_rate_percentage: int,
     ) -> "CartItem":
         """
         Add tax rate percentage to the cart item.
@@ -261,7 +261,7 @@ def add_tax_rate_percentage(
 
         Parameters
         ----------
-        tax_rate_percentage: (float) The tax rate percentage to be added.
+        tax_rate_percentage: (int) The tax rate percentage to be added.
 
         Returns
         -------
@@ -279,7 +279,8 @@ def add_tax_rate_percentage(
             )
 
         try:
-            self.tax_table_selector = str(tax_rate_percentage / 100)
+            rating = tax_rate_percentage / 100
+            self.tax_table_selector = str(rating)
         except (ValueError, TypeError) as e:
             raise InvalidArgumentException(
                 "Tax rate percentage cannot be converted to a string.",
diff --git a/tests/multisafepay/unit/api/shared/cart/test_unit_cart_item.py b/tests/multisafepay/unit/api/shared/cart/test_unit_cart_item.py
index 7b067a3..26a844c 100644
--- a/tests/multisafepay/unit/api/shared/cart/test_unit_cart_item.py
+++ b/tests/multisafepay/unit/api/shared/cart/test_unit_cart_item.py
@@ -231,5 +231,25 @@ def test_add_tax_rate_percentage():
 
     """
     item = CartItem()
-    item.add_tax_rate_percentage(21.0)
+    item.add_tax_rate_percentage(21)
     assert item.tax_table_selector == "0.21"
+
+
+def test_add_tax_rate_percentage():
+    """
+    Test that a 0 tax rate percentage is correctly set as the tax table selector in a CartItem.
+
+    """
+    item = CartItem()
+    item.add_tax_rate_percentage(0)
+    assert item.tax_table_selector == "0.0"
+
+
+def test_add_tax_rate_percentage():
+    """
+    Test that a 0.0 tax rate percentage is correctly set as the tax table selector in a CartItem.
+
+    """
+    item = CartItem()
+    item.add_tax_rate_percentage(0.0)
+    assert item.tax_table_selector == "0.0"