Not for domestic US shipments. They're best practice, not law. For international shipments, customs authorities often require them alongside a commercial invoice.
Can I use a packing slip as an invoice?
No. Packing slips don't include prices, payment terms, or tax info. You need a separate invoice for accounting and customs purposes.
Should I include prices on my packing slip?
No. Keep prices off packing slips. Many orders are gifts, and recipients shouldn't see what the buyer paid.
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