I have been using FrontAccounting for several years and one of the things that has annoyed me is that the Fiscal Years admin function is difficult to use and limited in functionality. At first glance it appears to be able to do anything you could want it to, but you will quickly find (and an inspection of the code will confirm) that the validation will not allow you to change the year start, and the year end must be the year start plus one year less a day, so you can enter anything you like but there is only one valid combination.

My Fiscal Years Replacement extension addresses both of these issues. I have replaced the start and end date fields with a single button to add a new year, which is a much simpler UI, with the identical functionality. If there is only one fiscal year (and no transactions) the start date can be changed to whatever is required (the end date will be set to the start date plus a year less one day). Once transactions have been entered (or there is more than one fiscal year) the start date is fixed and can not be changed.

The module can be downloaded from:

https://github.com/PaulShipley/admin_fiscalyear

For a full description see

https://paulshipley.id.au/blog/frontaccounting/fiscal-years-replacement/