Invoice Arithmetic and Terms Check
Check an invoice before paying or sending.
Added October 15, 2026. Written with AI assistance and checked for clarity and placeholders; not reviewed by a lawyer, accountant, clinician or other professional. How these prompts are made
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[VERIFY] is an editorial flag, not a blank to fill. Wherever the prompt shows [VERIFY], check that item against a reliable source before you use it (what [VERIFY] means).
Check an invoice. The invoice text with items, quantities, prices, tax lines, total and payment terms: [INVOICE_TEXT]. The purchase order or agreed quote: [AGREED_PRICES]. Payment details held on file: [PAYMENT_DETAILS]. Recalculate each line and the total, compare with the agreed prices, check tax lines, dates and terms, and flag changes to payment details that should be verified by phone using a known number. Do not authorise payment. Return a table with Line, Invoice, Recalculated and Difference, a list of questions for the supplier, and a payment verification checklist. Tax and invoice requirements are [VERIFY] for [JURISDICTION]. Also compare the invoice date and due date with the agreed terms and list what to confirm before payment, such as purchase order number and delivery confirmation. Check the arithmetic twice and show the working. A figure that fails a sanity check is a question to investigate, not proof of error or wrongdoing, so avoid accusatory wording. Add a closing paragraph on what success will look like in four weeks, with two observable signs that I can check without special tools.
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