Selim Anyoneâs guess is as good as mine as no one can predict what the British government will do after the Brexit.
The main difference between assets outside of the UK between assets in non-EU/EEA-countries will be respected when a deal appears out of the political turmoil at Westminster.
In case of a no-deal, assets outside of the UK will be treated as any asset abroad, like now in non-EU/EEA-countries, which hardly differs from the way assets in the EU/EEA are treated.
Your main issue will be that bunq loses the permit to trade as a bank in the UK and as such will not be able to offer any new services in the UK. As existing services are provided under the current permit, bunq will be able to continue these services. As long as Downing Street doesnât become fanatic about protection of the British economy (which they will get eventually).
So the dream of bunq ever opening GBP-accounts will evaporate with the Brexit, but nothing really will change for existing customers.
For local tax regulation a lot will change however. The equal treatment of assets within the UK and other EU-countries is no longer required so the government will be allowed to charge extra for assets abroad. Seeing where the British economy is headed after the Brexit, they will stimulate citizens to move their assets to the UK and enforce a surcharge on foreign assets.
This is likely to happen as the Pound is going to need reinforcement against currencies like the dollar and the euro more than ever as London cannot lean on the EU-economy