20 or 25 years ago, international tax was something you studied a bit when training as an accountant, but in practical terms only those advising the very wealthy really had to engage with it. There was far less global mobility, relatively few freelancers moving to and from the UK, and digital nomads hadn’t been invented yet.
How things have changed! Now it’s really common for people - especially knowledge workers - to move in and out of the UK. International tax is no longer a theoretical subject!
So, it’s very common for us to have clients who arrive in, or leave, the UK. If you’re a sole trader or an employee, it’s probably fairly straightforward; mostly, people making “clean”, permanent moves are going to get something called “split year treatment”. That means that in the year of arrival only their income post-arrival goes on their tax return, and in the year of their departure only their income pre-departure. There can be some minor friction where they’ve moved to a country that considers them to have become resident there before or after they’ve ceased to be resident here, they may have other things going on (like property or investment income) that are more complex, and when moves aren’t so clean the deceptively complicated Statutory Residence Test comes into play, but most cases are pretty simple.
But if you have a limited company it’ll be messier. In our experience, it’s vanishingly rare for the continued use of a UK company to be a good idea post-departure. If you were a non-UK resident starting a new business, the circumstances under which a UK company would be the best vehicle would be somewhere between rare and non-existent. Leaving the UK whilst in possession of an LTD doesn’t change that underlying reality. Sometimes you might need to persist with your UK LTD for a bit (perhaps there’s an ongoing contract in progress that you need to finish), but in the end you’re going to want to set up whatever structure is most advisable in your new home.
Unfortunately, it can be quite difficult to execute this at the other end! It seems to be very common for someone to go to an accountant in France, for example, only to be told to just keep their head down and pay taxes as if they continue to reside in the UK. As UK taxpayers, we are quite happy for people to pay tax money into UK coffers rather than those of another country! However, as Chartered Accountants, that can put us in a difficult position; we can’t collaborate on a setup where we know that taxes aren’t being paid appropriately, or National Insurance credits being built up by someone who is not really entitled to them, or UK pension contributions being made in excess of the modest “run-off” amount available for a few years to someone leaving the UK, and so on.
It can be further complicated because often people won’t know their plans for sure. Someone who expects to be in Portugal for a year or two might not want to go to great efforts to set up a structure that they’re soon going to dismantle. But that’s always been the case; we’re quite likely to advise someone who comes to the UK with the intention of staying for a couple of years differently to someone who intends it as their forever home.
So, if you’re leaving the UK, please go and see an accountant in your new intended home as soon as you can! Your accountant here may be able to tolerate a period where you’re getting things set up at that end and continuing to run things at this end as you have been. But they won’t be able to tolerate it indefinitely.