diff --git a/singer_sdk/_singerlib/schema.py b/singer_sdk/_singerlib/schema.py
index 9ef615e0d..41dd8104b 100644
--- a/singer_sdk/_singerlib/schema.py
+++ b/singer_sdk/_singerlib/schema.py
@@ -21,6 +21,7 @@
     "minLength",
     "format",
     "type",
+    "default",
     "required",
     "enum",
     "pattern",
@@ -47,6 +48,7 @@ class Schema:
     """
 
     type: str | list[str] | None = None  # noqa: A003
+    default: t.Any | None = None
     properties: dict | None = None
     items: t.Any | None = None
     description: str | None = None
diff --git a/tests/_singerlib/test_schema.py b/tests/_singerlib/test_schema.py
index 07589f431..4fa72c5a8 100644
--- a/tests/_singerlib/test_schema.py
+++ b/tests/_singerlib/test_schema.py
@@ -4,10 +4,10 @@
 
 from singer_sdk._singerlib import Schema, resolve_schema_references
 
-STRING_SCHEMA = Schema(type="string", maxLength=32)
-STRING_DICT = {"type": "string", "maxLength": 32}
-INTEGER_SCHEMA = Schema(type="integer", maximum=1000000)
-INTEGER_DICT = {"type": "integer", "maximum": 1000000}
+STRING_SCHEMA = Schema(type="string", maxLength=32, default="")
+STRING_DICT = {"type": "string", "maxLength": 32, "default": ""}
+INTEGER_SCHEMA = Schema(type="integer", maximum=1000000, default=0)
+INTEGER_DICT = {"type": "integer", "maximum": 1000000, "default": 0}
 ARRAY_SCHEMA = Schema(type="array", items=INTEGER_SCHEMA)
 ARRAY_DICT = {"type": "array", "items": INTEGER_DICT}
 OBJECT_SCHEMA = Schema(