From 1st January 2016, the taxpayers (or their representatives) with a tax data box or those who have a legal duty to have their closing financial statement verified by an auditor will not be able to submit an application for registration, a notification of change of registration data, a deregistration request, a regular and additional tax returns, a recapitulative statement and a settlement to tax office through the tax data message without certified electronic signature and subsequently confirm them in physical form by an e-form. Transition period during which it was possible will expire on 31st December 2015.