Automate Tax Compliance for Gmail Invoices with n8n Workflow

Revolutionize Your Tax Compliance Process with Automated Gmail Invoice Workflows

Eliminate manual tax compliance checks and ensure accuracy with our n8n workflow that automates the entire process. Specifically designed to monitor Gmail for PDF invoices, this workflow leverages advanced extraction and validation techniques to streamline your tax compliance tasks, while keeping your team informed and compliant every step of the way.

What this workflow does

• Triggers every minute upon the arrival of a new email in Gmail and downloads the attached PDF invoice for further processing.
• Utilizes Groq (Llama 3.3) to extract and parse invoice fields into a structured JSON schema, ensuring SEZ/LUT detection is included.
• Cross-references the Purchase Order number in Google Sheets and fetches corresponding tax rules from a Notion database.
• Validates the invoice against the Purchase Order (existence, approval status, currency, and total amount) and against the tax rules from Notion (SEZ/import/domestic matching and GST expectations).
• Logs the compliance outcome along with the matched rule and any violations to a Notion “Compliance Audit Log” database.
• For compliant invoices, sends an approval notification to Slack and archives the PDF in a Google Drive folder.
• If non-compliant, alerts are sent in Slack, and a rejection notice detailing violations is emailed to the supplier.

Use cases

• Ideal for businesses seeking to automate their invoice tax compliance procedures, reducing manual workload and potential errors.
• Perfect for organizations managing a high volume of international invoices where SEZ/LUT detection and specific tax rules are crucial.
• Valuable for finance teams relying on a seamless integration between Google Workspace tools and Notion for streamlined workflows.

Technical details

• This workflow employs a combination of n8n nodes: if, set, code, Gmail, merge, and Slack for flawless operation.
• Integrates with Groq for advanced invoice field extraction, Google Sheets for PO validations, Notion for tax rules, Slack for notifications, and Google Drive for document archiving.

Optimize your tax compliance with this powerful, automated workflow and keep your operations running efficiently and effectively.