diff --git a/phosphor-regulators/src/config_file_parser.cpp b/phosphor-regulators/src/config_file_parser.cpp
index e458ba7..5f0181e 100644
--- a/phosphor-regulators/src/config_file_parser.cpp
+++ b/phosphor-regulators/src/config_file_parser.cpp
@@ -120,9 +120,8 @@
     }
     else if (element.contains("not"))
     {
-        // TODO: Not implemented yet
-        // action = parseNot(element["not"]);
-        // ++propertyCount;
+        action = parseNot(element["not"]);
+        ++propertyCount;
     }
     else if (element.contains("or"))
     {
@@ -576,6 +575,14 @@
     return std::make_unique<I2CWriteBytesAction>(reg, values, masks);
 }
 
+std::unique_ptr<NotAction> parseNot(const json& element)
+{
+    // Required action to execute
+    std::unique_ptr<Action> action = parseAction(element);
+
+    return std::make_unique<NotAction>(std::move(action));
+}
+
 std::unique_ptr<PMBusWriteVoutCommandAction>
     parsePMBusWriteVoutCommand(const json& element)
 {
diff --git a/phosphor-regulators/src/config_file_parser.hpp b/phosphor-regulators/src/config_file_parser.hpp
index d81e403..e2476a2 100644
--- a/phosphor-regulators/src/config_file_parser.hpp
+++ b/phosphor-regulators/src/config_file_parser.hpp
@@ -27,6 +27,7 @@
 #include "i2c_write_bit_action.hpp"
 #include "i2c_write_byte_action.hpp"
 #include "i2c_write_bytes_action.hpp"
+#include "not_action.hpp"
 #include "pmbus_write_vout_command_action.hpp"
 #include "presence_detection.hpp"
 #include "rail.hpp"
@@ -440,6 +441,18 @@
 }
 
 /**
+ * Parses a JSON element containing a not action.
+ *
+ * Returns the corresponding C++ NotAction object.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return NotAction object
+ */
+std::unique_ptr<NotAction> parseNot(const nlohmann::json& element);
+
+/**
  * Parses a JSON element containing a pmbus_write_vout_command action.
  *
  * Returns the corresponding C++ PMBusWriteVoutCommandAction object.
diff --git a/phosphor-regulators/test/config_file_parser_tests.cpp b/phosphor-regulators/test/config_file_parser_tests.cpp
index ed3c271..4dfc45e 100644
--- a/phosphor-regulators/test/config_file_parser_tests.cpp
+++ b/phosphor-regulators/test/config_file_parser_tests.cpp
@@ -27,6 +27,7 @@
 #include "i2c_write_bit_action.hpp"
 #include "i2c_write_byte_action.hpp"
 #include "i2c_write_bytes_action.hpp"
+#include "not_action.hpp"
 #include "pmbus_utils.hpp"
 #include "pmbus_write_vout_command_action.hpp"
 #include "presence_detection.hpp"
@@ -350,7 +351,16 @@
     // TODO: Not implemented yet
 
     // Test where works: not action type specified
-    // TODO: Not implemented yet
+    {
+        const json element = R"(
+            {
+              "not":
+              { "i2c_compare_byte": { "register": "0xA0", "value": "0xFF" } }
+            }
+        )"_json;
+        std::unique_ptr<Action> action = parseAction(element);
+        EXPECT_NE(action.get(), nullptr);
+    }
 
     // Test where works: or action type specified
     // TODO: Not implemented yet
@@ -2547,6 +2557,30 @@
     }
 }
 
+TEST(ConfigFileParserTests, ParseNot)
+{
+    // Test where works
+    {
+        const json element = R"(
+            { "i2c_compare_byte": { "register": "0xA0", "value": "0x00" } }
+        )"_json;
+        std::unique_ptr<NotAction> action = parseNot(element);
+        EXPECT_NE(action->getAction().get(), nullptr);
+    }
+
+    // Test where fails: Element is not an object
+    try
+    {
+        const json element = R"( [ "0xFF", "0x01" ] )"_json;
+        parseNot(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not an object");
+    }
+}
+
 TEST(ConfigFileParserTests, ParsePMBusWriteVoutCommand)
 {
     // Test where works: Only required properties specified