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Running your business·Guide 8 min read

B2B Invoice Requirements

Fields corporate finance teams commonly expect before approving payment.

  • —B2B invoices often need PO numbers and legal entity names.
  • —Billing address may differ from service location.
  • —Missing fields stall approval queues.

Purchase orders

Many companies require a valid PO number on every invoice. Ask the buyer's AP contact before the first bill and store the PO on the invoice and in your records.

  • Buyer company legal name
  • Billing address
  • AP email or portal

Billing entity details

Use the legal company name, billing address, and accounts payable email — not only your project contact. Invoices sent to the wrong mailbox often sit unpaid without notice.

  • PO number on header
  • Department or cost center
  • Approver name when required

Tax and registration IDs

Depending on region, buyers may need your tax ID, VAT number, or business registration on the invoice. Requirements vary — this is not tax or legal advice.

  • VAT/GST/EIN when applicable
  • Not legal advice
  • Verify with client AP checklist

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Invoice Checker · Invoice with PO number

Requirements vary by country and business type. This guide explains common billing workflows and is not tax, legal, or accounting advice.