Automate Journal Entries with Python

If you’re manually keying journal entries every month, you’re wasting hours on something a script can do in seconds.

I used to key 200+ routine entries every close. Same accounts, same structure, different numbers. It took two days. Now it takes 30 seconds.

Here’s how.

What You Need

Python 3.10+
Your ERP’s API credentials (ask IT — most modern systems have a REST API)
A CSV of your journal entries

The Script

import csv
from erp_client import connect

client = connect("netsuite", env="production")

with open("entries.csv") as f:
    entries = list(csv.DictReader(f))
    for row in entries:
        client.post_entry(
            debit=float(row["debit"]),
            credit=float(row["credit"]),
            account=row["account_code"],
            memo=f"Auto: {row['description']}"
        )

print(f"Posted {len(entries)} entries")

That’s it. 20 lines.

The CSV Format

Your CSV needs four columns:

account_code	description	debit	credit
4000	Revenue accrual	0	125000
1200	Accounts receivable	125000	0
5100	Rent expense	15000	0
2000	Accrued liabilities	0	15000

⚡ Heads Up

This example uses a generic erp_client library. Your actual import will depend on your ERP — NetSuite, SAP, QuickBooks, etc. The pattern is the same.

What Changes

Before: 2 days of manual entry, ~15 errors per month, constant interruptions.

After: 30 seconds, zero errors, you move on to actual analysis.

✓ Result

After running this on my team's close process, we recovered 16 hours per month. That time went to variance analysis — work that actually requires judgment.

Common Mistakes

⚠ Common Mistake

Never hardcode your ERP credentials in the script. Use environment variables or a secrets manager. Credentials in source code will eventually leak.

ℹ Note

You'll need API access to your ERP. Most systems support this — NetSuite, SAP, Sage, and QuickBooks Online all have REST APIs. Ask your IT team for credentials and rate limits.

Next Steps

This script handles the simplest case: flat CSV → journal entries. In the next post, we’ll handle multi-line entries, validation, and dry-run mode so you can preview before posting.

The point isn’t the code. The point is: stop doing the same thing manually every month.