Invoice creator with Google Sheets & automated email payment reminder system

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

This automated n8n workflow streamlines invoice creation and payment reminders. It generates invoices on a monthly schedule and sends reminders for overdue payments, updating records in Google Shee...

Best for

Invoice Processing automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.cron, n8n-nodes-base.googlesheets, n8n-nodes-base.code, n8n-nodes-base.emailsend, n8n-nodes-base.switch, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Oneclick AI Squad.

Original n8n.io source

1.1 Workflow description

Title: Invoice creator with Google Sheets & automated email payment reminder system
Workflow name: Invoice creator with Google Sheets & automated email payment reminder system

Good to Know

Supports monthly invoice generation and daily overdue checks
Integrates with Google Sheets for data management
Uses email notifications for invoice delivery and reminders
Includes logging for tracking and auditing
Features multiple reminder types based on overdue duration

How It Works

Invoice Creation Flow:

Monthly Invoice Trigger - Initiates workflow on a set monthly schedule
Get Clients for Invoicing - Reads client data from Google Sheet
Filter Active Clients - Filters out inactive clients
Generate Invoice Data - Creates invoice details in required format
Save Invoice to Google Sheets - Appends or updates invoice record in the sheet
Send Invoice Email - Sends the invoice to the client via email
Log Invoice Creation - Logs invoice creation for records/auditing

Reminder Flow:

Daily Payment Reminder Check - Triggers workflow daily to check overdue invoices
Get Overdue Invoices - Reads overdue invoices from Google Sheet
Filter Overdue Invoices - Filters invoices still unpaid
Calculate Reminder Type - Calculates how many days overdue
Switch Reminder Type - Decides which type of reminder to send
Send Gentle / Follow-up / Urgent / Final Notice - Sends respective reminder email
Update Reminder Log - Updates reminder status in the sheet

How to Use

Import workflow into n8n
Configure Google Sheets API for data access
Set up email service for notifications
Define monthly schedule for invoice trigger
Test with sample client data and monitor reminders
Adjust reminder thresholds as needed

Requirements

Access to Google Sheets API
Email service configuration
Scheduled trigger setup in n8n

Sheet Columns:

Client Name
Invoice ID
Amount
Due Date
Status
Reminder Type
Last Updated

Customizing This Workflow

Modify invoice generation schedule
Adjust reminder email templates
Configure custom Google Sheet columns
Set custom overdue thresholds
Integrate additional notification methods

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Monthly Invoice Trigger

Type / Role: n8n-nodes-base.cron - cron
Config choices: Version 1

Block 2 - Daily Payment Reminder Check

Type / Role: n8n-nodes-base.cron - cron
Config choices: Version 1

Block 3 - Get Clients for Invoicing

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 4 - Get Overdue Invoices

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 5 - Filter Active Clients

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 6 - Filter Overdue Invoices

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 7 - Generate Invoice Data

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 8 - Save Invoice to Google Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 9 - Send Invoice Email

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2

Block 10 - Calculate Reminder Type

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - Switch Reminder Type

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3

Block 12 - Send Gentle Reminder

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2

Block 13 - Send Follow-up Reminder

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2

Block 14 - Send Urgent Reminder

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2

Block 15 - Send Final Notice

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2

Block 16 - Update Reminder Log

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 17 - Log Invoice Creation

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 18 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Invoice creator with Google Sheets & automated email payment reminder system
Complexity	advanced
Nodes	19
Categories	Invoice Processing
Author	Oneclick AI Squad
Published	31 Jul 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/6744/6744.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Invoice Processing workflows

Frequently asked questions

What does Invoice creator with Google Sheets & automated email payment reminder system do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Invoice Processing use case.

Oneclick AI Squad

224 workflows

Nodes

n8n-nodes-base.cron n8n-nodes-base.googlesheets n8n-nodes-base.code n8n-nodes-base.emailsend n8n-nodes-base.switch n8n-nodes-base.stickynote

Complexity

advanced

Published 31 Jul 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/6744/6744.json

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Invoice creator with Google Sheets & automated email payment reminder system

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Good to Know

How It Works

Invoice Creation Flow:

Reminder Flow:

How to Use

Requirements

Sheet Columns:

Customizing This Workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Monthly Invoice Trigger

Block 2 - Daily Payment Reminder Check

Block 3 - Get Clients for Invoicing

Block 4 - Get Overdue Invoices

Block 5 - Filter Active Clients

Block 6 - Filter Overdue Invoices

Block 7 - Generate Invoice Data

Block 8 - Save Invoice to Google Sheets

Block 9 - Send Invoice Email

Block 10 - Calculate Reminder Type

Block 11 - Switch Reminder Type

Block 12 - Send Gentle Reminder

Block 13 - Send Follow-up Reminder

Block 14 - Send Urgent Reminder

Block 15 - Send Final Notice

Block 16 - Update Reminder Log

Block 17 - Log Invoice Creation

Block 18 - Sticky Note

Block 19 - Sticky Note1

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions