The invoice due date is the calendar date by which a buyer must pay an invoice in full. It is calculated from the invoice date plus the agreed payment term (e.g., Net 30 = invoice date + 30 days). Missing this date triggers late-fee and dunning policies.
For Net N terms: Due Date = Invoice Date + N days. For EOM (end of month) terms: Due Date = last day of the issue month + N days. Always show both the invoice date and the explicit due date — don't make customers do the math.
Net 30 means the full invoice amount is due 30 calendar days after the invoice date. It is the most common B2B payment term worldwide and signals normal credit terms — not '30 days from delivery' or '30 days from receipt' unless explicitly stated.
A proforma invoice is a preliminary bill of sale sent to a buyer before goods or services are delivered. It is not a legal demand for payment and not used for accounting — it confirms price, terms, and quantities so the buyer can issue a purchase order or arrange financing/customs.
A commercial invoice is the legally binding bill issued by a seller to a buyer after goods or services have been delivered. It is recorded in both parties' accounting systems, used for tax and customs, and serves as the formal demand for payment.
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