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The date on the top of the invoice should be the date the invoice was generated. The dates under the 'description' should be when the product was delivered or the service was performed.

They should be assigned sequentially, meaning that the number of each new invoice increases. Legally, an invoice number sequence should never contain repeats or gaps. It's not recommended to simply number invoices '1', '2', '3', etc. as this can be confusing when invoice numbers reach double or triple figures.

This could be using the full date or omitting the day in the numbering sequence. This means your invoices will be organized by month and year only. A simple way of formatting the date into an invoice number is 01012022 or 01-01-2022. After the date, a simple sequential invoice number such as 001 or 01 should follow.

Chronological invoice numbers typically include the date as well as a unique invoice number so that not all invoices from the same day end up with the same number. For example, 20210531-1001, 20210531-1002, etc. You can assign an individual number to each of your clients and use it as part of your invoice number.

Significance of invoice date The date on the invoice signifies the time and date when the goods were billed and the official records were made for the transaction. Hence, the invoice date holds crucial information related to the payment because it tells the duration of the credit and the due date.

M/D/YYYY (one digit days / months)

Another common approach is to use the current year as an identifier, and then add a sequence of numbers from there, such as '210001' followed by '210002'. The next system requires you to input invoice numbers in chronological order. Chronological order means assigning invoice numbers ing to the date.

Use unique numbers Make each invoice number unique to avoid confusion. Duplicate invoice numbers may get misfiled, discarded or processed multiple times. For example, if you start your invoice numbering with 0001, avoid starting over with the same number the following month or year.