diff --git a/python/src/functions/generate_treasury_report.py b/python/src/functions/generate_treasury_report.py
index 1cd4dc0b..b941f050 100644
--- a/python/src/functions/generate_treasury_report.py
+++ b/python/src/functions/generate_treasury_report.py
@@ -14,7 +14,11 @@
 from pydantic import BaseModel
 
 from src.lib.logging import get_logger, reset_contextvars
-from src.lib.s3_helper import download_s3_object, upload_generated_file_to_s3
+from src.lib.s3_helper import (
+    delete_file_from_s3,
+    download_s3_object,
+    upload_generated_file_to_s3,
+)
 from src.lib.treasury_generation_common import (
     OrganizationObj,
     OutputFileType,
@@ -54,6 +58,7 @@ class ProjectLambdaPayload(BaseModel):
     ProjectType: str
     uploadsToAdd: Dict[AgencyId, UploadObj]
     uploadsToRemove: Dict[AgencyId, UploadObj]
+    forceRegenerate: bool = False
 
 
 @reset_contextvars
@@ -132,6 +137,16 @@ def process_event(
 
     organization = payload.organization
 
+    # If we need to force-regenerate the treasury report, we delete the treasury
+    # report from s3 so that it starts with the template file.
+    if payload.forceRegenerate:
+        delete_output_file(
+            s3_client=s3_client,
+            organization=organization,
+            project_use_code=project_use_code,
+            logger=logger,
+        )
+
     # If the treasury report file exists, download it and store the data
     # If it doesn't exist, download the output template
 
@@ -267,6 +282,29 @@ def process_event(
     return {"statusCode": 200, "body": "Success"}
 
 
+def delete_output_file(
+    s3_client: S3Client,
+    organization: OrganizationObj,
+    project_use_code: str,
+    logger: structlog.stdlib.BoundLogger,
+):
+    try:
+        delete_file_from_s3(
+            client=s3_client,
+            bucket=os.environ["REPORTING_DATA_BUCKET_NAME"],
+            key=get_generated_output_file_key(
+                file_type=OutputFileType.XLSX,
+                project=project_use_code,
+                organization=organization,
+            ),
+        )
+    except ClientError as e:
+        error = e.response.get("Error") or {}
+        if error.get("Code") == "404":
+            logger.exception("Expected to find an existing treasury output report")
+            raise
+
+
 def download_output_file(
     s3_client: S3Client,
     output_file: IO[bytes],
diff --git a/python/src/lib/s3_helper.py b/python/src/lib/s3_helper.py
index bca00002..ac8dc95d 100644
--- a/python/src/lib/s3_helper.py
+++ b/python/src/lib/s3_helper.py
@@ -29,6 +29,31 @@ def download_s3_object(
         raise
 
 
+def delete_file_from_s3(client: S3Client, bucket: str, key: str) -> None:
+    """Deletes file from S3.
+
+    Args:
+        client: Client facilitating delete from S3
+        bucket: bucket file should be deleted from
+        key: S3 key for file
+    """
+    logger = get_logger()
+
+    logger = logger.bind(upload={"s3": {"bucket": bucket, "key": key}})
+    try:
+        client.delete_object(
+            Bucket=bucket,
+            Key=unquote_plus(key),
+        )
+    except:
+        logger.exception(
+            f"failed to delete file from S3, bucket {bucket} and key {key}"
+        )
+        raise
+
+    logger.info("successfully deleted file from s3")
+
+
 def upload_generated_file_to_s3(
     client: S3Client,
     bucket: str,
@@ -45,7 +70,7 @@ def upload_generated_file_to_s3(
     """
     logger = get_logger()
 
-    logger = logger.bind(upload={"s3": {"bucket": bucket, "key": key}})
+    logger = logger.bind(delete={"s3": {"bucket": bucket, "key": key}})
     try:
         file.seek(0)
         client.put_object(