# Process invoices and expense reports with AI

> Extract invoice fields, categorize expenses, flag anomalies, and route records for approval.

- Canonical: https://gptnavi.com/workflows/process-invoices-and-expense-reports-with-ai
- Category: Operations
- Difficulty: Advanced
- Setup time: 3 hours
- Estimated time saved: 3-10 hours
- Last materially updated: 2026-08-24
- Best for: Small businesses, Operators, Finance teams
- Tools: Google Sheets, n8n, ChatGPT, Feishu Base

## Quick answer

This workflow creates a semi-automated finance intake process while keeping human review for sensitive approvals.

## When to use it

- Invoice intake
- Expense report review
- Vendor payment preparation

## Steps

1. **Create an intake folder** — Collect invoices and receipts in a shared folder or form submission flow. Tool: Feishu Base. Expected output: A centralized intake queue.
2. **Extract key fields** — Use AI to extract vendor, amount, date, tax, invoice number, due date, and line items. Tool: ChatGPT. Expected output: Structured invoice data.
3. **Classify and flag** — Categorize expenses and flag duplicates, unusual amounts, missing fields, or unapproved vendors. Tool: Google Sheets. Expected output: A review sheet with status labels.
4. **Route approvals** — Send clean records to the right reviewer and keep exceptions in a manual review queue. Tool: n8n. Expected output: Approval notifications and review tasks.

## Prompt templates

### Invoice extractor

Extract structured invoice fields from this text. Return vendor, invoice number, date, due date, amount, tax, line items, currency, and missing fields. Text: [paste]

### Expense anomaly checker

Review these expense records. Flag duplicates, unusual amounts, missing information, vendor risks, and category inconsistencies. Records: [paste]

## Common mistakes

- Removing human review too early
- Not checking duplicate invoices
- Mixing extraction and payment approval

## Related workflows

- https://gptnavi.com/workflows/internal-ai-assistant-from-company-docs
- https://gptnavi.com/workflows/automate-lead-intake-and-qualification
- https://gptnavi.com/workflows/meeting-notes-to-action-items