How to catch supplier invoice errors and price creep with AI

Short answer: keep a price log of your top 20–30 items, count key items at the door, and once a week upload invoice photos to ChatGPT or Claude with that price log. Ask it to flag price changes, short deliveries and math errors, then confirm each flag on the paper invoice before you dispute it.

Where the money goes

Most supplier mistakes are honest, but they rarely go in your favor:

• Price creep: an item goes up a little each week, and nobody notices.
• Short deliveries: a case is missing or a weight comes in light, but you're billed for the full amount.
• Substitutions at a higher price.
• Math or unit errors: priced by the case when you agreed on per pound, or a line entered twice.

Even 1–2% of your monthly supplier spend is real money. Our checkup estimates it from your own spend, and the math is on How we estimate.

The AI check, step by step

1. Build a price log in Google Sheets: item, supplier, unit, agreed price, and date.
2. Set up a project in ChatGPT or Claude with that price log and your checking rules.
3. Check at the door: count and weigh high-value items, and write any shortage on the invoice before the driver leaves.
4. Weekly: photograph the invoices and upload them. Ask for a table of every line where the price, quantity or math doesn't match.
5. Request credits in writing from your sales rep, with the invoice number and line.

AI can misread a blurry photo, so treat every flag as a lead and check it against the paper invoice.

Step-by-step

Prompts, a price-log template and dispute wording are in the free playbook: AI Invoice Double-Check.

FAQ

Is it safe to upload invoices to ChatGPT or Claude?

Invoices usually contain supplier and pricing info, not guest data. Check your AI tool's data settings, and turn off model training on your chats if that option is available.

Do I need accounting software?

No. A Google Sheet and photos are enough to start. If you already use an invoice-scanning tool, use its export the same way.