Whether or not you should contact the government prior to your departure depends on your personal situation. You should consider:
How long you will be gone, as the length of your stay abroad will affect your taxes, and your right to receive government sponsored health benefits and pensions.
If you have properties or holdings in your home country.
We recommend that you thoroughly investigate your own situation before leaving and contact an accountant for advice. Once in your new country of residence, contact your embassy there to register your name and address.