Every year, around the last week of August, the same thing happens in my practice. The phones go quiet in July, stay quiet through the middle of August, and then, somewhere between the end of the school holidays and the first cool morning, they start ringing again. The callers are almost always people who spent the summer somewhere pleasant, looked around, and asked themselves the question that changes everything: why am I going back?
I have been watching this rhythm for the better part of twenty years, first in my UK practice, which I built from 2006, then in the US side from 2008, and now across the whole international structure of my firm. And I have come to a conclusion that surprises people when I say it out loud: September is the most important month in the relocation year. Not January, with its resolutions that dissolve by February. Not the summer itself, which is for dreaming, not deciding. September.
Here is why, and here is what the fourth quarter actually demands of you if you are serious about moving.
Why September Decides the Year
The logic is simple once you see it. Almost everything that matters in international relocation runs on a calendar-year clock. Tax residence in most countries is measured against the calendar year. Exit timing works cleanest at a year-end. Residence programmes, banking relationships, school enrolments: they all have rhythms that culminate in December and reset in January.
Which means that by the time most people start thinking seriously about these things, in November, when the year-end pressure becomes visible, the good options have already expired. The people who move well are the people who did their thinking in September, when there was still time to act on the conclusions.
The summer gives you the motivation. September gives you the window. December only gives you the bill.
Let me walk through the checklist I actually use with clients.
First: Count Your Days, Now
The single most common residence test in the world is some version of the 183-day rule, measured against the calendar year. Spain is the textbook example: spend more than 183 days there in a calendar year and you are tax resident, and Spanish law adds a twist that catches people constantly, because temporary absences are counted as days in Spain unless you can prove tax residence somewhere else. Spain also does not do partial years for this purpose: you are resident for the whole year or not at all.
Other countries run variations on the theme, some with rolling twelve-month windows, some with additional tests around your family, your home, your economic centre of gravity. The details differ. The structural point does not: the balance is struck at 31 December, and by September you can still influence which side of the line you land on.
So the September exercise is this. Sit down with your travel records, and I mean actual records, boarding passes and calendar entries, not your memory, and count where you have physically been this year. If you are trying to establish residence somewhere new, do you have enough days left in the year to get there? If you are trying to break residence somewhere old, are you drifting toward a threshold without noticing? A client of mine, and I am compositing several people here, once discovered in late November that a string of "short visits" back home had quietly added up to something dangerous. In September he would have had room to adjust. In November he had to cancel Christmas plans instead.
Count your days in September. It is the cheapest piece of tax planning that exists.
Second: If You Are Leaving, Leave at the Year-End
If you are planning to give up residence in a high-tax country, the cleanest exit is almost always the one that aligns with the tax year. Leave mid-year and you often create a messy split: part-year residence, apportioned allowances, two countries arguing over the same income, and a filing season that costs you more in advisory fees than the move itself. Leave at the year-end and you hand your adviser a clean file: resident here until 31 December, resident there from 1 January.
There is a second reason the timing matters, and it is bigger: exit taxation. Many countries levy a tax on unrealised gains when you cease residence, particularly on substantial shareholdings. The size of that bill, the valuation dates, the instalment options, the question of whether a restructuring beforehand makes sense: none of this can be improvised in the week before you fly. A year-end exit that has been prepared since September is a controlled procedure. A year-end exit decided in December is an accident in progress.
And if a clean 1 January start is the goal, work backwards from it. Housing, registration, health cover, the physical act of moving a household: three months is a realistic runway. Which puts the decision point, once again, in September.
Third: Programmes and Regimes Run on Annual Clocks
Special tax regimes are creatures of the tax year. Whether it is a flat-tax arrangement, a new-resident programme, or a remittance-basis system, the year in which you enter, and what you do before that year begins, tends to matter enormously.
Malta is the example I know best, for the simple reason that I have been sending clients there since 2012 and my sister-in-law has lived there since the same year. Malta still runs the last functioning remittance-basis non-dom regime in the EU: as a resident non-dom you are taxed on Maltese income and on foreign income you bring into Malta, while foreign capital gains stay outside the Maltese net even if you remit them. The consequence is that the structure of your accounts on the day you arrive matters. Which account holds pre-arrival capital, which holds income, what you will live on once you are there: this is planning that has to happen before the move, not after. I have written about how the regime compares with Malta's programme-based special tax statuses, and if Malta is on your shortlist for 2027, the practical sequence is in my moving to Malta checklist. The short version for present purposes: an autumn of preparation makes a January arrival in Malta clean. A spontaneous arrival makes the first year needlessly expensive.
The same principle applies to every other regime with an annual clock. If the programme you want turns on the tax year, the entry work belongs in the autumn before.
Fourth: Move Your Banking Before December
Here is a piece of field knowledge that no statute will give you: the back offices of banks and brokers get slower as the year ends. Compliance teams are working through annual reviews and reporting cycles, staff take leave over the holidays, and account openings and portfolio transfers that glide through in October crawl in December. I see it every year, across jurisdictions, without exception.
If your relocation involves new bank accounts, and it almost always does, or moving an investment portfolio to a new broker, start in September or October. A portfolio transfer between brokers can take weeks even in a good month, and a transfer that straddles the year-end creates its own reporting complications: positions in flight, cost-basis records split across two institutions, statements that do not reconcile. None of it is fatal. All of it is avoidable by starting early.
There is also the simpler point that you do not want to land in a new country in January with no functioning local account because your application has been sitting in a December queue.
Fifth: Order Your Documents in the Autumn
Residence applications run on paperwork, and the paperwork has freshness dates. The German criminal record certificate, the Führungszeugnis, is the classic case. The certificate itself has no statutory validity period: the receiving authority decides how old a certificate it will accept, and in practice many want to see something recent, often no more than a few months old. For use abroad you will frequently also need an apostille or a further legalisation on top, which adds its own processing time.
This creates a timing sandwich. Order the certificate too early and it will be stale by the time your Q1 application is filed. Order it too late and the apostille queue eats your deadline. For a residence application planned for January or February, the autumn is exactly the right moment: request the certificate, and any legalisation, so that it arrives fresh inside the window your target country accepts. The same logic applies to birth and marriage certificates, bank reference letters, and anything else with an implicit shelf life. Make the list in September. Order in sequence.
Sixth: The Family Clock Runs Even Earlier
If you have school-age children, your relocation calendar is not the tax calendar. It is the school calendar, and it is less forgiving. A family that wants to move in the summer of 2027, so that the children start the new school year in the new country, is making that decision in the autumn of 2026. Not because the removal van needs a year of notice, but because the schools do: the good international and private schools in the popular destinations take applications in the autumn and winter for the following September, and the best of them fill up.
I have watched families get every financial and legal element of a move exactly right and then stumble on this, ending up in their third-choice school because the decision that felt "early" in the spring was in fact late. When we moved our own family across borders, the school question was settled before most of the others were even asked. If schooling is part of your picture, and for an idea of what that looks like in one of my favourite jurisdictions, see my piece on schools and education in Malta, then the autumn before the move year is your real deadline.
Seventh: The December Premium Is Real
One last observation from inside the advisory trade, offered without embarrassment because it applies to my own firm as much as anyone's. Every adviser worth engaging is at capacity in the fourth quarter. Year-end restructurings, exit cases, filing preparation: the calendar fills by November. The client who calls in September gets thinking time, sequencing, alternatives weighed properly. The client who calls in the last week of November gets whatever can still be executed in four weeks, at rush pricing, with no room for second thoughts.
I call it the December premium. It is not a surcharge anyone publishes. It is the structural cost of asking for careful work in the one month when careful work is scarcest. The entire fee difference between a September engagement and a late-November one usually exceeds the cost of simply having started earlier, and that is before counting the value of the options that expired in between.
The Reset
So that is the September reset. Count your days while the count can still be changed. If you are leaving, aim the exit at the year-end and prepare it now. If your destination runs an annual-clock regime, do the entry work this autumn. Move the banking before the December crawl. Order the documents so they are fresh in Q1, not stale. If children are involved, accept that the 2027 summer move is a 2026 autumn decision. And if you want professional help, ask for it while the professionals can still think.
None of this is glamorous. It is lists and dates and counting. But I have seen the difference, year after year, between the people who do this work in September and the people who compress it into December. The first group starts the new year in a new life. The second group starts it in a queue.
The summer showed you what you want. September is when you decide whether you meant it.
Work with Sebastian
If this autumn is your September reset, let us build the Q4 plan properly: days, exit timing, structure, banking, documents, schools, in the right order and with time to think. Book a consultation.
