Notifying a second citizenship: who has to, and by when

A number of countries require their citizens to declare the acquisition of another nationality, or of a foreign residence permit, within a defined period. The requirement is administrative, cheap to satisfy, and produces penalties out of proportion when it is missed.

What the duties look like

• A deadline running from acquisition, frequently short, with a longer period for those abroad at the time.
• A specified form lodged with a designated authority or a consulate.
• Documents: the foreign document, its translation, and evidence of the date it was granted.
• Penalties for late or absent filing, which in some systems escalate from administrative to criminal for deliberate concealment.

Related duties people miss

• Foreign residence permits, not only citizenships, are declarable in some systems.
• Foreign bank accounts, under separate reporting regimes with their own forms and deadlines.
• Foreign companies you control, under controlled foreign company rules.
• Change of address, which sounds trivial and is the mechanism by which every other notice reaches you.

Why people miss them

Because nothing prompts them. The country granting the new status does not tell the old one, and the old one does not know to ask. The obligation is entirely self-executing, and it is discovered years later at a renewal, a border, or an inheritance.

The instruction

On the day a new status is granted, look up the notification duty of every country whose citizenship you hold — not the country you live in, the countries whose passports you hold — and diarise the deadline. It is twenty minutes of work.

Where a deadline has already passed, late filing is almost always better than continued silence: penalties for lateness are ordinary, and penalties for concealment discovered by the authority are not.