diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4dcf248d0..39e90632e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the Imperative package will be documented in this file.
 
+## Recent Changes
+
+- Enhancement: Added `inSchema` property for ProfileInfo to indicate if argument is a known schema argument [#899](https://github.com/zowe/imperative/issues/899)
+
 ## `5.16.0`
 
 - Enhancement: Handled unique cookie identifier in the form of dynamic token types. [#966](https://github.com/zowe/imperative/pull/996)
diff --git a/packages/config/__tests__/ProfileInfo.TeamConfig.test.ts b/packages/config/__tests__/ProfileInfo.TeamConfig.test.ts
index bbb33f7b5..cd05cc12a 100644
--- a/packages/config/__tests__/ProfileInfo.TeamConfig.test.ts
+++ b/packages/config/__tests__/ProfileInfo.TeamConfig.test.ts
@@ -308,20 +308,20 @@ describe("TeamConfig ProfileInfo tests", () => {
 
     describe("getAllProfiles", () => {
         it("should return all profiles if no type is specified", async () => {
-            const length = 7;
             const expectedDefaultProfiles = 4;
             const expectedDefaultProfileNameZosmf = "LPAR1";
             const expectedDefaultProfileNameTso = "LPAR1.tsoProfName";
             const expectedDefaultProfileNameBase = "base_glob";
             const expectedDefaultProfileNameDummy = "LPAR4";
             let actualDefaultProfiles = 0;
-            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3", "LPAR1.tsoProfName", "LPAR1.tsoProfName.tsoSubProfName", "base_glob", "LPAR4"];
+            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3", "LPAR1.tsoProfName", "LPAR1.tsoProfName.tsoSubProfName",
+                "base_glob", "LPAR4", "LPAR5"];
 
             const profInfo = createNewProfInfo(teamProjDir);
             await profInfo.readProfilesFromDisk();
             const profAttrs = profInfo.getAllProfiles();
 
-            expect(profAttrs.length).toEqual(length);
+            expect(profAttrs.length).toEqual(expectedProfileNames.length);
             for (const prof of profAttrs) {
                 if (prof.isDefaultProfile) {
                     let expectedName = "";
@@ -355,7 +355,7 @@ describe("TeamConfig ProfileInfo tests", () => {
             const desiredProfType = "zosmf";
             const expectedName = "LPAR1";
             const expectedDefaultProfiles = 1;
-            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3", "LPAR2_home"];
+            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3", "LPAR2_home", "LPAR5"];
             let actualDefaultProfiles = 0;
 
             const profInfo = createNewProfInfo(teamProjDir);
@@ -389,7 +389,7 @@ describe("TeamConfig ProfileInfo tests", () => {
             const desiredProfType = "zosmf";
             const expectedName = "LPAR1";
             const expectedDefaultProfiles = 1;
-            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3"];
+            let expectedProfileNames = ["LPAR1", "LPAR2", "LPAR3", "LPAR5"];
             let actualDefaultProfiles = 0;
 
             const profInfo = createNewProfInfo(teamProjDir);
@@ -753,6 +753,28 @@ describe("TeamConfig ProfileInfo tests", () => {
             }
         });
 
+        it("should find correct inSchema args", async () => {
+            const profInfo = createNewProfInfo(teamProjDir);
+            await profInfo.readProfilesFromDisk();
+            const profAttrs = profInfo.getAllProfiles()[7] as IProfAttrs;
+            const mergedArgs = profInfo.mergeArgsForProfile(profAttrs);
+
+            const expectedArgs = [
+                { argName: "host", inSchema: true },
+                { argName: "port", inSchema: true },
+                { argName: "responseFormatHeader", inSchema: false },
+                { argName: "fakeOffSchemaArg", inSchema: false },
+                { argName: "user", inSchema: true },
+                { argName: "password", inSchema: true },
+                { argName: "rejectUnauthorized", inSchema: true },
+            ];
+
+            expect(mergedArgs.knownArgs.length).toBe(expectedArgs.length);
+            for (const [idx, arg] of mergedArgs.knownArgs.entries()) {
+                expect(arg.inSchema).toEqual(expectedArgs[idx].inSchema);
+            }
+        });
+
         it("should throw if schema fails to load", async () => {
             const profInfo = createNewProfInfo(teamProjDir);
             await profInfo.readProfilesFromDisk();
diff --git a/packages/config/__tests__/__resources__/ProfInfoApp_team_config_proj/ProfInfoApp.config.json b/packages/config/__tests__/__resources__/ProfInfoApp_team_config_proj/ProfInfoApp.config.json
index 9d85bf752..9eea51ef1 100644
--- a/packages/config/__tests__/__resources__/ProfInfoApp_team_config_proj/ProfInfoApp.config.json
+++ b/packages/config/__tests__/__resources__/ProfInfoApp_team_config_proj/ProfInfoApp.config.json
@@ -60,6 +60,15 @@
                 "host": "LPAR4.your.domain.net",
                 "responseFormatHeader": true
             }
+        },
+        "LPAR5": {
+            "type": "zosmf",
+            "properties": {
+                "host": "LPAR4.your.domain.net",
+                "port": 1234,
+                "responseFormatHeader": true,
+                "fakeOffSchemaArg": "fakeArg"
+            }
         }
     },
     "defaults": {
diff --git a/packages/config/src/ProfileInfo.ts b/packages/config/src/ProfileInfo.ts
index e85ad1038..0e1f3a197 100644
--- a/packages/config/src/ProfileInfo.ts
+++ b/packages/config/src/ProfileInfo.ts
@@ -623,7 +623,8 @@ export class ProfileInfo {
                         dataType: this.argDataType(typeof propVal),  // TODO Is using `typeof` bad for "null" values that may be int or bool?
                         argValue: propVal,
                         argLoc,
-                        secure
+                        secure,
+                        inSchema: false
                     });
                 }
             }
@@ -654,7 +655,8 @@ export class ProfileInfo {
                             dataType: this.argDataType(typeof propVal),
                             argValue: propVal,
                             argLoc,
-                            secure
+                            secure,
+                            inSchema: false
                         });
                     }
                 }
@@ -746,6 +748,7 @@ export class ProfileInfo {
                                 dataType: this.argDataType(propInfoInSchema.type),
                                 argValue: (propInfoInSchema as ICommandProfileProperty).optionDefinition?.defaultValue,
                                 argLoc,
+                                inSchema: true,
                                 // See https://github.com/zowe/imperative/issues/739
                                 secure: foundInSecureArray || propInfoInSchema.secure
                             };
@@ -760,6 +763,7 @@ export class ProfileInfo {
                     if (!argFound) {
                         mergedArgs.missingArgs.push({
                             argName: propName,
+                            inSchema: true,
                             dataType: this.argDataType(propInfoInSchema.type),
                             argValue: (propInfoInSchema as ICommandProfileProperty).optionDefinition?.defaultValue,
                             argLoc: { locType: ProfLocType.DEFAULT },
@@ -767,6 +771,7 @@ export class ProfileInfo {
                         });
                     }
                 } else {
+                    knownArg.inSchema = true;
                     knownArg.secure = knownArg.secure ?? propInfoInSchema.secure;
                     if (knownArg.secure) {
                         delete knownArg.argValue;
diff --git a/packages/config/src/doc/IProfArgAttrs.ts b/packages/config/src/doc/IProfArgAttrs.ts
index f227b2bed..70c80512a 100644
--- a/packages/config/src/doc/IProfArgAttrs.ts
+++ b/packages/config/src/doc/IProfArgAttrs.ts
@@ -35,4 +35,7 @@ export interface IProfArgAttrs {
 
     /** Whether the argument value is stored securely */
     secure?: boolean;
+
+    /** Whether the argument value is defined in the schema file */
+    inSchema?: boolean;
 }