Multi-Source Tax & Cash Flow Forecasting with GPT-4, Gmail and Google Sheets

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Built by Cheng Siong Chin Cheng Siong Chin
Created on June 05, 2026

Description

How It Works
Automates monthly revenue aggregation from multiple sources with intelligent tax forecasting using GPT-4 structured analysis. Fetches revenue data from up to three distinct sources, consolidates datasets into unified records, applies OpenAI GPT-4 model for predictive tax obligation forecasting with context awareness. System generates formatted reports with structured forecast outputs and automatically sends comprehensive tax projections to agents via Gmail, storing results in Google Sheets for audit trails. Designed for tax professionals, accounting firms, and finance teams requiring accurate predictive tax planning, cash flow forecasting, and proactive compliance strategy without manual calculations.

Setup Steps
Configure OpenAI API key for GPT-4 model access
Connect three revenue data sources with appropriate credentials
Map data aggregation logic for multi-source consolidation
Define structured output schema for forecast results
Set up Gmail for automated agent notification
Configure Google Sheets destination
Prerequisites
OpenAI API key with GPT-4 access, Gmail account, Google Sheets, three revenue data source credentials

Use Cases
Monthly tax liability projections, quarterly estimated tax planning

Customization
Adjust forecast model parameters, add additional revenue sources, modify email templates

Benefits
Eliminates manual tax calculations, enables proactive tax planning, improves cash flow forecasting accuracy

Nodes Used (6)

AI Agent
@n8n/n8n-nodes-langchain.agent
Gmail
n8n-nodes-base.gmail
Google Sheets
n8n-nodes-base.googleSheets
HTTP Request
n8n-nodes-base.httpRequest
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured