Does this connect to my accounting software?

The MVP works with Google Sheets; if you use an accounting tool with an open API, you can swap the Sheets node for that API call instead.

How many invoices can it handle?

n8n's free tier handles thousands of rows without issue.

Customer OperationsStructurally Validated

Invoice Reminders & Tracking

This automation scans your Google Sheets invoice tracker every day; for invoices due within 3 days or already overdue, it sends the customer a polite reminder email and drops a daily summary to your team on Telegram. No more manual chasing or missed payments falling through the cracks.

Automation flow

Step 1

Daily Trigger (09:00)

Runs automatically every morning.

Step 2

Read Invoice List

Your invoice tracker in Google Sheets gets read.

Step 3

Filter Due Invoices

Invoices due within 3 days or overdue are picked out.

Step 4

Remind Customer

A personalized reminder email goes out per invoice.

Step 5

Team Summary

A daily collections summary lands in Telegram.

How it works

Filter Due Invoices picks out unpaid invoices due within 3 days (or already overdue). Each one gets a personalized reminder email to the customer, and your team gets a Telegram summary.

Services used

Google SheetsGmailTelegramSchedule Trigger

What you'll need

n8n (Cloud trial or self-hosted)
Google account (Sheets + Gmail)
Telegram

What's included

Automated follow-up that improves cash flow
Sheets invoice template included
Threshold (3 days, 7 days...) easily adjustable
No extra accounting software required

Estimate what this could save you

Times per week

Minutes each time

Your hourly value ($)

3.6 hours/month

≈ $108/month in your time

A rough estimate based on what you enter above — not a guarantee. Actual time saved depends on your process.

Make it yours

Adjust the threshold (3 days) by editing diffDays <= 3 in Filter Due Invoices.
Customize the email copy to match your brand voice.

Works well with this automation

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Save with the complete system: Customer Ops & Support Bundle

Instead of buying separately: $181 — System: $79

View system

Questions about this template

$15one-time

Secure checkout via Polar. Delivered by email instantly.

Structurally validated: automatically checked for valid n8n format before every deploy.

Difficulty: Easy
Setup time: ~15 min
Integrations: 4
Node count: 5
Format: .json + guide