In NetSuite, transactions are posted in real time. If you choose to use accounting periods, you can enter a transaction and select its posting period from a dropdown list on the transaction page. The posting period can be future or past, depending on an administrator's choice for locking these periods.
This guide shows you how to setup or Generate Tax Reporting Periods for Full Year.
To setup a full year you need to establish the following variables;
First Fiscal Month: July (default)