diff --git a/deepform/data/add_features.py b/deepform/data/add_features.py
index 7d0e477..b434cb2 100644
--- a/deepform/data/add_features.py
+++ b/deepform/data/add_features.py
@@ -94,6 +94,9 @@ def extend_and_write_docs(
 
     logger.debug(f"Writing document index to {pq_index}...")
     doc_index = pd.DataFrame(doc_results).set_index("slug", drop=True)
+
+    # Avoid mixed dtypes, which can cause errors in pyarrow while exporting to parquet
+    doc_index["gross_amount"] = doc_index.gross_amount.astype(str)
     doc_index.to_parquet(pq_index)
 
 
diff --git a/deepform/util.py b/deepform/util.py
index 3e1ff8b..1f7860c 100644
--- a/deepform/util.py
+++ b/deepform/util.py
@@ -36,7 +36,9 @@ def default_similarity(lhs, rhs):
 
 def is_dollar_amount(s):
     try:
-        return num_digits(s) > 0 and bool(re.match(r"^\$?\d*(,\d\d\d)*(\.\d\d)?$", s))
+        return num_digits(s) > 0 and bool(
+            re.match(r"^\$?\d*(,\d\d\d)*(\.[\d]{1,2})?$", s)
+        )
     except TypeError:
         return False
 
diff --git a/tests/test_util.py b/tests/test_util.py
index bb118ed..d9d23bd 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -25,6 +25,8 @@ def test_is_dollar_amount():
     assert is_dollar_amount("3")
     assert is_dollar_amount("04")
     assert is_dollar_amount("9,000")
+    assert is_dollar_amount("10.0")
+    assert is_dollar_amount("$50.0")
     assert not is_dollar_amount("")
     assert not is_dollar_amount("$")
     assert not is_dollar_amount(",")
@@ -43,6 +45,7 @@ def test_dollar_amount():
     assert dollar_amount("3") == 3
     assert dollar_amount("04") == 4
     assert dollar_amount("9,000") == 9000
+    assert dollar_amount("1,300.0") == 1300.0
     assert dollar_amount("") is None
     assert dollar_amount("C") is None
     assert dollar_amount("$x") is None