Automate corporate tax filing for SMEs with GPT-5.2-Pro, Gmail, and Google Drive

by Cheng Siong Chin ✓ · 136 views · created 2025-12-22 · Document Extraction, AI Summarization

What this workflow does

This AI workflow has 15 nodes and runs on a schedule (every month at 09:00). Along the way it connects OpenAI Chat Model, Gmail and Google Drive.

How it runs

Trigger: On a schedule (every month at 09:00).

1. Workflow Configuration (Edit Fields (Set)): sets 6 fields: accountingApiUrl, accountingApiKey, taxAgentEmail…
2. Fetch Financial Data from Accounting Software (HTTP Request): calls an HTTP API
3. Tax Calculation Agent (AI Agent): runs an AI agent, with model: OpenAI Chat Model; 1 tool (Calculator); output parser: Tax Report Output Parser
4. Format Pre-Filing Report (Edit Fields (Set)): sets 4 fields: reportTitle, companyName, reportDate…
5. Submission Coordinator Agent (AI Agent): runs an AI agent, with model: OpenAI Chat Model; 2 tools (Gmail Send Tool, Google Drive Archive Tool)
6. Check for Feedback (If): checks a condition and branches into true / false
7. Process Feedback and Corrections (Code): runs custom JavaScript code
8. Finalize Submission Data (Edit Fields (Set)): sets 4 fields: submissionStatus, finalizedDate, submittedBy…

Services it uses

OpenAI Chat ModelGmailGoogle Drive

Before you upgrade to n8n 3.0

Nodes used (11)

• Schedule Triggern8n-nodes-base.scheduleTrigger
• Edit Fields (Set)n8n-nodes-base.set
• AI Agent@n8n/n8n-nodes-langchain.agent
• OpenAI Chat Model@n8n/n8n-nodes-langchain.lmChatOpenAi
• Calculator@n8n/n8n-nodes-langchain.toolCalculator
• Structured Output Parser@n8n/n8n-nodes-langchain.outputParserStructured
• Gmail Tooln8n-nodes-base.gmailTool
• Google Drive Tooln8n-nodes-base.googleDriveTool
• Ifn8n-nodes-base.if
• Coden8n-nodes-base.code
• HTTP Requestn8n-nodes-base.httpRequest

From the author

How It Works This workflow automates monthly tax filing processes by retrieving financial data, performing AI-driven tax calculations, coordinating pre-filing reviews with key stakeholders, incorporating feedback, and managing overall submission readiness. It…

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