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diff --git a/common/src/Common/Model/Frequency.hs b/common/src/Common/Model/Frequency.hs
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+++ b/common/src/Common/Model/Frequency.hs
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+{-# LANGUAGE DeriveGeneric #-}
+
+module Common.Model.Frequency
+  ( Frequency(..)
+  ) where
+
+import Data.Aeson (FromJSON, ToJSON)
+import GHC.Generics (Generic)
+
+data Frequency =
+  Punctual
+  | Monthly
+  deriving (Eq, Read, Show, Generic)
+
+instance FromJSON Frequency
+instance ToJSON Frequency