The selections you make in this window define your company’s accounting year. As these selections cannot be changed once the company file has been created, consult with your accountant if you are unsure of the selections you need to make.
This is the earliest month for which you want to record transactions. For example, if you want to enter transactions dated 1 September or later, your conversion month is September. You cannot enter transactions dated before the conversion month.
You can choose to have 12 or 13 accounting periods. A 13th period is a period for recording entries which you do not want included in the accounting figures for a particular month. For example, you can use it to record year-end adjustments that are attributed to all months. If in doubt, choose 13 periods.