diff --git a/crypto_seller/__init__.py b/crypto_seller/__init__.py
index 6e82c98..fca054d 100644
--- a/crypto_seller/__init__.py
+++ b/crypto_seller/__init__.py
@@ -62,11 +62,15 @@ most mature on the danish market, and does support KuCoin.
 
 ## TODO
 
-- [ ] Log all trades to CSV file.
 - [ ] Parse configuration from json.
-- [X] Collect information during the run and output after run
+- [ ] Ensure that a failure during selling results in a safe winding down of the system.
+      * Catch runtime errors when selling
+      * Show errors to log.
+      * Stop loop and exit with results, and error indicator.
 - [ ] Document configuration
 - [ ] Document auditing
+- [X] Log all trades to CSV file.
+- [X] Collect information during the run and output after run
 
 """
 
@@ -88,17 +92,9 @@ from ._version import __version__
 
 logger = logging.getLogger(__name__)
 
-################################################################################
-# Constants #
-
-PATH_OUTPUT = Path('./output').absolute()
-PATH_LOG_FILE = PATH_OUTPUT / 'log.txt'
-PATH_TRADES_FILE = PATH_OUTPUT / 'trades.csv'
-
 ################################################################################
 # Main code #
 
-
 @dataclasses.dataclass(frozen=True)
 class AutoSellConfig:
     """Configuration for `run_auto_sell`.
@@ -123,6 +119,7 @@ class AutoSellConfig:
     output_asset: fin_defs.Asset
     seller: fin_depo.defi_kucoin.KucoinDepoFetcher
     sleep: Callable[[float], None]
+    log_order_to_csv: Callable[[fin_depo.data.TradeOrderDetails], None]
     exit_when_empty: bool = True
 
 
@@ -187,9 +184,8 @@ def run_auto_sell(config: AutoSellConfig) -> AutoSellRunResults:
                 config.output_asset,
             )
 
-            print(order_details)
+            config.log_order_to_csv(order_details)
             all_executed_orders.append(order_details)
-            # TODO: Write order details to file.
 
             del amount_to_sell
         elif config.exit_when_empty:
diff --git a/crypto_seller/__main__.py b/crypto_seller/__main__.py
index e01b527..c83ac3e 100644
--- a/crypto_seller/__main__.py
+++ b/crypto_seller/__main__.py
@@ -1,18 +1,34 @@
+import argparse
 import datetime
 import logging
 import logging.handlers
-import argparse
 import time
 from decimal import Decimal
+from pathlib import Path
 
 import fin_defs
 import fin_depo
 
-from . import PATH_LOG_FILE, AutoSellConfig, config, run_auto_sell, log_results
+from . import (
+    AutoSellConfig,
+    config,
+    log_results,
+    order_csv,
+    run_auto_sell,
+)
 from . import logger as module_logger
 
 logger = logging.getLogger(__name__)
 
+################################################################################
+# Constants #
+
+PATH_OUTPUT = Path('./output').absolute()
+PATH_LOG_FILE = PATH_OUTPUT / 'log.txt'
+PATH_TRADES_FILE = PATH_OUTPUT / 'trades.csv'
+
+################################################################################
+# Application Setup #
 
 def setup_logging():
     """Enables logging for the terminal and to a log file."""
@@ -30,14 +46,17 @@ def setup_logging():
     logger.setLevel('INFO')
     module_logger.setLevel('INFO')
 
+
 CLI_DESCRIPTION = """
 Sells financial assets from an online account.
 """.strip()
 
+
 def parse_args():
-    parser = argparse.ArgumentParser('crypto_seller', description = CLI_DESCRIPTION)
+    parser = argparse.ArgumentParser('crypto_seller', description=CLI_DESCRIPTION)
     return parser.parse_args()
 
+
 def main():
     """Initializes the program."""
     setup_logging()
@@ -60,6 +79,7 @@ def main():
         exit_when_empty=True,
         seller=seller_backend,
         sleep=time.sleep,
+        log_order_to_csv=order_csv.CsvFileLogger(PATH_TRADES_FILE),
     )
     results = run_auto_sell(auto_sell_config)
     logging.info('Sell-offs complete')
diff --git a/crypto_seller/order_csv.py b/crypto_seller/order_csv.py
new file mode 100644
index 0000000..79434a8
--- /dev/null
+++ b/crypto_seller/order_csv.py
@@ -0,0 +1,25 @@
+import csv
+from pathlib import Path
+
+import fin_depo
+
+
+class CsvFileLogger:
+    def __init__(self, path: Path):
+        self.path = path
+
+    def __call__(self, trade_order: fin_depo.data.TradeOrderDetails):
+        fieldnames: list[str] = [
+            'input_asset',
+            'input_amount',
+            'output_asset',
+            'output_amount',
+            'fee_asset',
+            'fee_amount',
+            'order_id',
+            'raw_order_details',
+        ]
+
+        with open(self.path, 'a') as f:
+            writer = csv.DictWriter(f, fieldnames=fieldnames)
+            writer.writerow(trade_order.__dict__)
diff --git a/test/test_auto_sell.py b/test/test_auto_sell.py
index e28302e..25f1613 100644
--- a/test/test_auto_sell.py
+++ b/test/test_auto_sell.py
@@ -1,10 +1,12 @@
 import datetime
 from decimal import Decimal
+from pathlib import Path
 
 import fin_defs
 import fin_depo
 
 import crypto_seller
+import crypto_seller.order_csv
 
 
 class SellerMock(fin_depo.data.DepoFetcher):
@@ -59,6 +61,9 @@ def test_auto_run():
         output_asset=fin_defs.USD,
         exit_when_empty=True,
         seller=seller_mock,
+        log_order_to_csv=crypto_seller.order_csv.CsvFileLogger(
+            Path('output/test-trades.csv'),
+        ),
         sleep=sleep_mock,
     )