Final answer:
To offer a customer 30 days to pay an invoice, it is entered as 'Net 30' in the invoice's payment terms, indicating payment is due within 30 days of the invoice date.
Step-by-step explanation:
When you want to offer a customer 30 days to pay an invoice, it is typically entered as 'Net 30' in the payment terms of the invoice. This means that the total invoice amount is due within 30 days from the invoice date. When creating the invoice, ensure that the date of the invoice is clearly stated, as well as the due date, which would be 30 days from this date. It's important to communicate clearly to the customer that payment is expected within this time frame to avoid any misunderstanding or delay in payment.