Automated Overdue Invoice Reminder System

This n8n workflow automates the process of managing overdue invoices by daily scanning a Google Sheet for unpaid and overdue invoices, calculating how many days they are overdue (DPD), and sending personalized email reminders. The process begins with a cron trigger set to run every morning at 6 AM, then loads invoice data from Google Sheets, filters for unpaid and overdue invoices, calculates the days past due, and generates tailored reminder messages depending on how overdue each invoice is. The workflow concludes by emailing these reminders to clients, helping businesses improve collections efficiently. This setup is ideal for freelancers, agencies, and finance teams looking to automate their payment follow-up processes, ensure timely payments, and reduce manual tracking efforts.