Winston

With Winston You can submit your tax declarations electronically via the Internet at your local tax office.
In addition to the Advance Tax Return, you can also manage your income tax reporting and tax account inquiry with Winston.

Winston allows you to adapt the forms for tax declarations to suit your needs, simply by deleting unneeded fields from the form. Moreover, Winston also has a mandate management.
Note:
Since 2008, Winston has become chargeable. If you use only Winston for quarterly Advance Tax Return, no royalties have to be paid.