diff --git a/singer_sdk/streams/sql.py b/singer_sdk/streams/sql.py
index 3d3de5bbe..7a3fe3886 100644
--- a/singer_sdk/streams/sql.py
+++ b/singer_sdk/streams/sql.py
@@ -20,6 +20,7 @@ class SQLStream(Stream, metaclass=abc.ABCMeta):
     """Base class for SQLAlchemy-based streams."""
 
     connector_class = SQLConnector
+    _cached_schema: dict | None = None
 
     def __init__(
         self,
@@ -74,7 +75,7 @@ def metadata(self) -> MetadataMapping:
         """
         return self._singer_catalog_entry.metadata
 
-    @property
+    @property  # TODO: Investigate @cached_property after py > 3.7
     def schema(self) -> dict:
         """Return metadata object (dict) as specified in the Singer spec.
 
@@ -83,7 +84,13 @@ def schema(self) -> dict:
         Returns:
             The schema object.
         """
-        return t.cast(dict, self._singer_catalog_entry.schema.to_dict())
+        if not self._cached_schema:
+            self._cached_schema = t.cast(
+                dict,
+                self._singer_catalog_entry.schema.to_dict(),
+            )
+
+        return self._cached_schema
 
     @property
     def tap_stream_id(self) -> str: