Expense Anomaly Auditor with Slack Approval — AI Automation

Stop manually scanning expense reports line by line. This n8n workflow runs every morning, reads your transactions sheet, and automatically flags anything that needs a human's eyes — so you only review what actually matters.

How it works:

1. Runs daily on a schedule (default 7am, fully adjustable)

2. Pulls unreviewed rows from your Google Sheets expense tracker

3. Flags transactions that: exceed your custom dollar threshold, are missing a category, or look like a possible duplicate charge (same vendor + amount within 3 days)

4. Flagged expenses get posted straight to a Slack channel with the reason clearly stated, so managers can approve or reject in seconds

5. Clean transactions are automatically marked "reviewed" — no bottleneck for the 90% of expenses that are totally fine

Ideal for finance teams, bookkeepers, startup founders, and agencies who want fraud/error protection without hiring extra reviewers or building a custom finance tool.

What's included:

- Ready-to-import n8n JSON workflow

- Configurable anomaly threshold (default $500)

- Duplicate-detection logic (3-day window, adjustable)

- Slack approval integration

- Google Sheets read/write logic pre-built

- Setup guide included

Requires: Google Sheets, Slack workspace. No coding needed — connect your credentials, set your threshold, and activate.