diff --git a/model/enums.go b/model/enums.go
index 1e8faf4..18eb8fe 100644
--- a/model/enums.go
+++ b/model/enums.go
@@ -67,3 +67,17 @@ const (
 	RETRY_INTERVAL_ALGORITHM_TRIPLE_LINEAR_BACKOFF
 	RETRY_INTERVAL_ALGORITHM_FIXED
 )
+
+const (
+	TAX_METHOD_INCLUSIVE int16 = iota
+	TAX_METHOD_EXCLUSIVE
+)
+
+const (
+	REPORT_CALCULATE_TASK_STATUS_PENDING int16 = iota
+	REPORT_CALCULATE_TASK_STATUS_SUCCESS
+	REPORT_CALCULATE_TASK_STATUS_INSUFICIENT_DATA
+	REPORT_CALCULATE_TASK_STATUS_SUSPENDED
+	REPORT_CALCULATE_TASK_STATUS_UNKNOWN_ERROR
+	REPORT_CALCULATE_TASK_STATUS_UNEXISTS = 99
+)