diff --git a/unit/models/codecs.py b/unit/models/codecs.py
index aed24b2..788f90d 100644
--- a/unit/models/codecs.py
+++ b/unit/models/codecs.py
@@ -372,6 +372,9 @@
 
         "receivedPayment.created": lambda _id, _type, attributes, relationships:
         ReceivedPaymentCreatedEvent.from_json_api(_id, _type, attributes, relationships),
+
+        "writeOffTransaction": lambda _id, _type, attributes, relationships:
+        WriteOffTransactionDTO.from_json_api(_id, _type, attributes, relationships),
 }
 
 
diff --git a/unit/models/transaction.py b/unit/models/transaction.py
index 4f5ed86..6fa0a88 100644
--- a/unit/models/transaction.py
+++ b/unit/models/transaction.py
@@ -463,6 +463,18 @@ def from_json_api(_id, _type, attributes, relationships):
         return NegativeBalanceCoverageTransactionDTO(
             _id, date_utils.to_datetime(attributes["createdAt"]), attributes["amount"], attributes["direction"], attributes["balance"], attributes["summary"], attributes.get("tags"), relationships)
 
+class WriteOffTransactionDTO(BaseTransactionDTO):
+    def __init__(self, id: str, created_at: datetime, amount: int, direction: str,
+                 balance: int, summary: str, tags: Optional[Dict[str, str]], relationships: Optional[Dict[str, Relationship]]):
+        BaseTransactionDTO.__init__(self, id, created_at, direction, amount, balance, summary, tags, relationships)
+        self.type = 'writeOffTransaction'
+
+    @staticmethod
+    def from_json_api(_id, _type, attributes, relationships):
+        return WriteOffTransactionDTO(
+            _id, date_utils.to_datetime(attributes["createdAt"]), attributes["amount"], attributes["direction"], attributes["balance"], attributes["summary"], attributes.get("tags"), relationships)
+
+
 TransactionDTO = Union[OriginatedAchTransactionDTO, ReceivedAchTransactionDTO, ReturnedAchTransactionDTO,
                        ReturnedReceivedAchTransactionDTO, DishonoredAchTransactionDTO, BookTransactionDTO,
                        PurchaseTransactionDTO, AtmTransactionDTO, FeeTransactionDTO, CardTransactionDTO,