Swiss speciality: round everything to 0 or 5

Swiss speciality: round everything to 0 or 5

Swiss franc rounding module:

With this module, prices and VAT are rounded up or down to 0 or 5 centimes.

Of course, the VAT is then not quite correct in percentage terms, but according to a Swiss customer
this is not a problem.

The module does not change / edit the price entry in the admin.

It only rounds off the prices in the frontend.
These are then also correctly transferred to the order, the invoices and the statistics.