Representation with authorities

You can grant a general power of attorney to a trusted person in the event of a planned longer absence, e.g. a stay abroad or a medical procedure. To make provisions for a sudden and permanent incapacity of judgment, an advance care directive is required.

Yes, a power of attorney is generally required. The power of attorney must be clear and precise in order to avoid any misunderstandings and problems.

Representation by a third party is possible in many matters, e.g. for tax, social security and administrative matters. However, a power of attorney to a third party should always be carefully considered.