diff --git a/packages/google-cloud-kms/helperMethods.ts.tmpl b/packages/google-cloud-kms/helperMethods.ts.tmpl
deleted file mode 100644
index 773675cf9f4..00000000000
--- a/packages/google-cloud-kms/helperMethods.ts.tmpl
+++ /dev/null
@@ -1,33 +0,0 @@
-  /**
-   * This part will be added into src/v1/key_management_service_client.ts by synth.py.
-   * KMS service requires IAM client for [setIamPolicy, getIamPolicy, testIamPerssion] methods.
-   * But we don't support it now in micro-generators for rerouting one service to another and mix them in.
-   * New feature request link: [https://github.com/googleapis/gapic-generator-typescript/issues/315]
-   *
-   * So this is manually written for providing methods to the KMS client.
-   * IamClient is created for KMS client in the constructor using src/helper.ts.
-   * [setIamPolicy, getIamPolicy, testIamPerssion] methods are created which is calling the corresponding methods from IamClient in `helper.ts`.
-   */
-
-  getIamPolicy(
-    request: protos.google.iam.v1.GetIamPolicyRequest,
-    options: gax.CallOptions,
-    callback: protos.google.iam.v1.IAMPolicy.GetIamPolicyCallback
-  ) {
-    return this._iamClient.getIamPolicy(request, options, callback);
-  }
-  setIamPolicy(
-    request: protos.google.iam.v1.SetIamPolicyRequest,
-    options: gax.CallOptions,
-    callback: protos.google.iam.v1.IAMPolicy.SetIamPolicyCallback
-  ) {
-    return this._iamClient.setIamPolicy(request, options, callback);
-  }
-  testIamPermissions(
-    request: protos.google.iam.v1.TestIamPermissionsRequest,
-    options: gax.CallOptions,
-    callback?: protos.google.iam.v1.IAMPolicy.TestIamPermissionsCallback
-  ) {
-    return this._iamClient.testIamPermissions(request, options, callback);
-  }
-}