# Validate invoice tax compliance from Gmail with Groq: n8n workflow

> Started by an arriving email, and works across Gmail, Google Drive, Google Sheets, Notion and one other. It hands the judgement calls to Groq.

Source: https://millionrounds.com/workflow/validate-invoice-tax-compliance-from-gmail-with-groq (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Money admin](https://millionrounds.com/workflows?category=Money+admin#library)

# Validate invoice tax compliance from Gmail with Groq

Started by an arriving email, and works across Gmail, Google Drive, Google Sheets, Notion and one other. It hands the judgement calls to Groq. 17 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: Groq

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvalidate-invoice-tax-compliance-from-gmail-with-groq)

**17 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**5** Services it connects to

## The flow

Starts it 1 Model 3 Logic 4 Service 9

The steps in the order they run, from what starts it.

- 1 **Invoice Field Schema** Output Parser Structured *Model*
- 2 **LLM** Lm Chat Groq *Model*
- 3 **Monitor Inbox** Gmail trigger *Starts it*
- 4 **AI Extract Invoice** Chain Llm *Model*
- 5 **Fetch Email Attachments** Gmail *Service*
- 6 **Fetch Tax Rules** Notion *Service*
- 7 **Format AI Output** Set *Logic*
- 8 **Lookup PO Details** Google Sheets *Service*
- 9 **Read PDF Content** Extract From File *Service*
- 10 **Consolidate Validation Data** Merge *Logic*
- 11 **Compliance Engine** Code *Logic*
- 12 **Log Audit Entry** Notion *Service*
- 13 **Check Compliance Status** If *Logic*
- 14 **Slack: Notify Approval** Slack *Service*
- 15 **Slack: Alert AP Team (Block)** Slack *Service*
- 16 **Archive to Google Drive** Google Drive *Service*
- 17 **Email: Notify Supplier of Rejection** Gmail *Service*

## How it's built

- **Starts on:** An arriving email
- **Steps:** 17, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Drive, Google Sheets, Notion, Slack
- **Model:** Groq

## Questions

What does it need to run?

An n8n account, plus your own Gmail, Google Drive, Google Sheets, Notion and Slack accounts, and a key for Groq. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an arriving email.

Does it use AI?

Yes. It calls Groq. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 17 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 17 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvalidate-invoice-tax-compliance-from-gmail-with-groq)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Drive](https://millionrounds.com/workflows?service=Google+Drive#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Notion](https://millionrounds.com/workflows?service=Notion#library)[Slack](https://millionrounds.com/workflows?service=Slack#library)

## Workflows like it

Also money admin, with the same services where possible, closest in size first.

- [**AI invoice and receipt data extractor with OpenAI** 17 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/ai-invoice-and-receipt-data-extractor-with-openai)
- [**Auto expense tracker from LINE messages with OpenAI** 17 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/auto-expense-tracker-from-line-messages-with-openai)
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- [**Automate tax compliance validation with OpenAI** 17 steps · calls a model · Gmail](https://millionrounds.com/workflow/automate-tax-compliance-validation-with-openai)
- [**Automated invoice data extraction with LlamaParse and Gemini** 17 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/automated-invoice-data-extraction-with-llamaparse-and-gemini)
- [**Automatic email invoice archiving & data extraction with Gmail** 17 steps · calls a model · FTP, Gmail](https://millionrounds.com/workflow/automatic-email-invoice-archiving-and-data-extraction-with-g)