1 files changed, 12 insertions, 0 deletions
diff --git a/finance/model.py b/finance/model.py
new file mode 100644
index 0000000..8bf2e3d
--- /dev/null
+++ b/finance/model.py
@@ -0,0 +1,12 @@
+import dataclasses
+import datetime
+import decimal
+
+
+@dataclasses.dataclass(kw_only=True, frozen=True)
+class Flow:
+    """Time-discrete flow of money paid on the first day of a month"""
+
+    amount: decimal.Decimal
+    since: None | datetime.datetime
+    until: None | datetime.datetime