diff --git a/conservancy_beancount/pdfforms/fields.py b/conservancy_beancount/pdfforms/fields.py
index 8a49567a6492c5078066ef4d840a3a217f81673c..23ebd6eff7fc997433e6c944ea4152a29801107f 100644
--- a/conservancy_beancount/pdfforms/fields.py
+++ b/conservancy_beancount/pdfforms/fields.py
@@ -8,6 +8,10 @@
 import enum
 import functools
 
+from decimal import Decimal
+
+import babel.numbers  # type:ignore[import]
+
 from pdfminer.pdftypes import resolve1  # type:ignore[import]
 from pdfminer import psparser  # type:ignore[import]
 from . import utils as pdfutils
@@ -22,6 +26,7 @@ from typing import (
     Sequence,
     Tuple,
     Union,
+    cast,
 )
 
 FieldSource = MutableMapping[str, Any]
@@ -238,7 +243,9 @@ class TextField(FormField):
     def value(self) -> Optional[str]:
         return self._decode(super().value())
 
-    def set_value(self, value: Optional[str]) -> None:
+    def set_value(self, value: Union[str, Decimal, float, int, None]) -> None:
+        if isinstance(value, (Decimal, float, int)):
+            value = cast(str, babel.numbers.format_decimal(value))
         super().set_value(None if value is None else pdfutils.encode_text(value))
 
     def fill_value(self) -> Optional[str]: