# Catch overcharges and duplicate bills hiding in your invoices

> One homeowner found about $45K in honest billing mistakes across three years of contractor invoices this way.

Upload a batch of invoices with the quotes or contracts they should match. The AI checks every line for wrong amounts, duplicates and misaddressed bills, then drafts a polite request to fix them.

- Page: https://thesolocreators.com/prompts/catch-overcharges-in-vendor-invoices/
- Category: Handle life admin fast
- Made for: Small business owners, Consultants, Everyone
- Works in: ChatGPT, Claude, Gemini
- Time: About 20 minutes
- Effort: A few steps
- Note: Works best with clear PDFs. Always confirm each item yourself before you contact the vendor.

## The prompt

Fill in the parts in [square brackets], or leave them and the AI will ask you for them.

```text
You're a careful accounts payable auditor. I've uploaded invoices from [VENDOR TYPE, e.g. my building contractor] plus the quotes, contracts and price lists they should match. Go through every invoice line by line and flag: wrong amounts or rates, charges that don't match the quote, items billed twice on the same or different invoices, math errors, work I didn't approve, and invoices addressed to the wrong person or business. Put the results in a table with the invoice number, date, line item, what it should be, what was billed, the difference and your confidence level. Total the possible overcharges at the end. Then draft a short, friendly email to the vendor that lists the items to review and asks for a corrected invoice or a credit. Assume these are honest mistakes.
```

## Step by step

1. Gather the invoices plus the quotes, contracts or price lists they should match.
2. Upload everything to ChatGPT, Claude or Gemini with the prompt below.
3. Check each flagged item yourself before you send the drafted email.

## What you'll get

A table of every questionable charge with the amount at stake, a running total and a polite email asking the vendor to correct it.

## Good to know

**Which AI tools does this work in?** It works in ChatGPT, Claude and Gemini. On this page, ChatGPT and Claude open with your prompt already typed in. Works best with clear PDFs. Always confirm each item yourself before you contact the vendor.

**How long does it take?** About 20 minutes. It's rated "A few steps". There are 3 steps, listed above.

**What do I need before I start?** Just your details for one blank: vendor type. You can skip any, and your AI will ask for them.

**What will I get back?** A table of every questionable charge with the amount at stake, a running total and a polite email asking the vendor to correct it.

Idea spotted on X, shared by @mitchellh: https://x.com/mitchellh/status/2077053324835389497. The prompt is The Solo Creators' own version.

## Go further

Ready-made skills in the Solo Creators AI Studio (https://thesolocreators.com/studio/) that fit this: TLDR (Your AI stops writing walls of text: every reply leads with the next action, numbered and skimmable); Second Brain (Give your AI a memory it reads across every project, so it finally knows your business).

From AI Use Cases and Prompts by The Solo Creators: https://thesolocreators.com/prompts/. Free to use; please link back to the page when you share it.