Automatic Invoice Detection & Reminder Creation with Gmail & Google Tasks — n8n Workflow

Medium complexity⏰ Scheduled10 nodes🏷️ Invoice Processing👁 2 viewsby Matt Chong | n8n Creator

Overview

This workflow contains community nodes that are only compatible with the self-hosted version of n8n.

Who is this for?

This workflow is for anyone who receives invoices by email and wants to stay on top of payment deadlines without manual tracking.

What problem is this workflow solving?

Invoices often get buried in your inbox. This workflow uses AI to find them, extracts key details, and adds a task to remind you to pay before it’s overdue.

No more missed payments. No more manual tracking.

Nodes used

Google TasksGmailAI AgentOpenAI Chat ModelStructured Output Parser

Workflow Preview

💡 Customize Task Format
You can change the title in this node. For example: `P
Include more invoice details in the notes field if need
⚠️ Setup Required
- Connect your Gmail account using OAuth2
- Add your OpenAI API Key under API Credentials
- Connect your Google Tasks account
- Create this label in Gmail: Invoice*
💡 Schedule Trigger
This runs every hour.
You can change the interval here depending on how often
modelparser
⚡
S
Schedule Trigger
AI Agent
OpenAI Chat Model
Structured Output Parser
N
No Operation, do nothing
Create a task
Add Label to Email
Mark Email as read
Get Unread Emails
C
Check If Email is Invoice
10 nodes9 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a scheduled trigger, running on a defined schedule.

  2. 2

    Process

    Data flows through 10 nodes, connecting agent, gmail, googletasks.

  3. 3

    Output

    The workflow completes its automation and delivers the result to the configured destination.

Node Details (10)

GO

Google Tasks

googleTasks

#1
GM

Gmail

gmail

#2
AI

AI Agent

n8n-nodes-langchain.agent

#3
OP

OpenAI Chat Model

n8n-nodes-langchain.lmChatOpenAi

#4
ST

Structured Output Parser

n8n-nodes-langchain.outputParserStructured

#5

How to Import This Workflow

  1. 1Click Download JSON button on the right to save the workflow file.
  2. 2Open your n8n instance. Go to Workflows → New → Import from file.
  3. 3Select the downloaded automatic-invoice-detection-reminder-creation-with-gmail-google-tasks file and click Import.
  4. 4Set up credentials for each service node (API keys, OAuth, etc.).
  5. 5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n → Import from JSON:

{ "name": "Automatic Invoice Detection & Reminder Creation with Gmail & Google Tasks", "nodes": [...], ...}

Integrations

agentgmailgoogletasksiflmchatopenaioutputparserstructuredscheduletrigger

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes10
Complexitymedium
Triggerscheduled
Views2
CategoryInvoice Processing

Created by

Matt Chong | n8n Creator

Matt Chong | n8n Creator

@mattxchong

Tags

agentgmailgoogletasksiflmchatopenaioutputparserstructuredscheduletrigger
⚡

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Automate Custom QuickBooks Invoice PDFs & Email with n8n

Standard accounting templates often fail to reflect a premium brand identity. This sophisticated n8n workflow bridges the gap between financial record-keeping and professional client presentation. By moving beyond the native limitations of QuickBooks Online, this automation enables businesses to generate high-end, multi-page PDF invoices that align perfectly with their corporate styling. The process begins the moment a new invoice is generated in QuickBooks, triggering a webhook that captures real-time billing data. The workflow then utilizes advanced HTML-to-File conversion and custom Code nodes to structure data into a polished, branded layout. It handles complex logic such as line-item merging and multi-page formatting automatically. Once the document is rendered, the system bypasses generic 'no-reply' senders by routing the finalized PDF through your preferred email provider. This ensures a seamless, white-labeled experience for your clients while eliminating the manual overhead of exporting, styling, and attaching files. Ideal for agencies and service providers, this flow guarantees that your most frequent touchpoint—the bill—is as professional as your work. **Common Use Cases:** - High-end creative agencies requiring bespoke, white-labeled billing documents for premium clients. - Automated recurring subscription billing where custom tax disclosures or localized branding are required. - Service-based businesses needing to attach dynamic project reports or terms of service directly to QuickBooks invoices.

🔗 Webhook·12 nodes