Leaving the UK isn’t the end of the story

When many families leave the UK, it feels like a line has been drawn.

Homes are sold or let, residency changes and life moves on. And with that comes a natural assumption:

“Our UK tax exposure is behind us.”

In practice, that’s rarely the case.

Over the past year, I’ve seen a growing pattern among internationally mobile families: the biggest risks don’t arise when you leave the UK, they surface later, sometimes years later, and often at the worst possible time.

A client story (shared with permission & details changed)

A couple came to see me two years after moving to Portugal. They had done what most people would consider sensible:

• kept their UK home "just in case"

• retained a shareholding in a family business

• left pensions untouched for flexibility

• kept their UK wills in place

They assumed everything was neatly behind them. But it wasn’t.

When we reviewed their situation, we discovered that their UK property could trigger capital gains exposure depending on timing, the family business relief they were relying on may no longer fully apply under the new relief caps, their wills did not reflect their residency or cross-border estate considerations, and their children (living in different jurisdictions) could face administrative delays and liquidity challenges with future IHT responsibilities.

None of these issues were caused by a mistake.

They arose because planning stopped when they left the UK.

That’s when the real planning should begin.

The shift happening right now

Recent UK developments - particularly around inheritance tax, pensions, and reliefs - are changing how ongoing UK exposure works in practice.

From April 2026:

• Business Property Relief (BPR) and Agricultural Property Relief (APR) will be capped at £2.5 million at 100% relief

• Value above this may receive 50% relief

• Unused pension funds are expected to fall within the inheritance tax net from April 2027 (subject to final implementation)

These developments signal a clear shift: The question is no longer whether reliefs exist, the question is whether they can be relied upon in practice.

Where families get caught out after leaving

The biggest problems rarely stem from a single mistake. They arise from assumptions made at exit that were never revisited.

Common pressure points include:

UK property retained for flexibility → later triggers unexpected tax exposure → temporary non-residence rules may apply

Pensions overlooked by overseas executors → delays accessing benefits → administrative complications

Family businesses once assumed fully relieved → now affected by APR/BPR caps

Wills and succession plans → often no longer reflect residence, assets, or family realities

As the report highlights, issues often emerge after departure, when structures age and circumstances change.

Residence no longer tells the whole story

Residence remains the starting point, but it is no longer the organising principle.

UK exposure today is shaped by:

• historic residence and long-term ties

• retained UK property or business interests

• pension arrangements in the UK (UK situs assets)

• asset structures

• how wealth passes on after death

You can be confidently non-UK resident and still carry meaningful UK exposure.

And that risk often surfaces only when:

• a property is sold

• a death occurs

• a business is disposed of

• a return to the UK takes place

By then, options are narrower.

The “time-lag” problem

One of the defining risks for expats is timing.

Decisions made when leaving may be sound at the time…but become misaligned as years pass.

Assets are kept for flexibility. Structures remain untouched. Succession plans are not updated.

The gap between where a family lives and how its wealth is structured grows wider, often unnoticed.

Until it really matters.

Inheritance tax: exposure beyond departure

Inheritance tax illustrates this clearly.

For long-term UK residents, exposure can persist for years after leaving.

Recent reforms increase the importance of:

• liquidity planning

• valuations

• sequencing of reliefs

• administrative readiness

For families abroad, inheritance tax risk often crystallises on death, particularly where executors are overseas and documentation has not kept pace with mobility. 

A better way to think about leaving the UK

Effective exit planning in 2026 isn’t about cutting ties. It’s about understanding what remains.

That means:

1. mapping ongoing UK exposure

2. revisiting plans as circumstances evolve

3. aligning succession planning with residence

4. ensuring structures remain workable across borders

The goal isn’t to eliminate UK connections.

It’s to understand them, and manage them deliberately.

Final thought

Private wealth planning is no longer about one-off decisions.

It’s about anticipating where exposure persists, how it crystallises, and ensuring plans remain aligned as families move, assets evolve, and laws change.

For internationally mobile families, leaving the UK is rarely the end of the story. But with the right planning, it doesn’t have to become a problem later.

I work closely with trusted tax and legal specialists in both the UK and Portugal to ensure planning remains aligned across jurisdictions and reflects each client’s residency, assets, and long-term objectives. If you would welcome a review of your financial situation then please do reach out for a free, no obligation Discovery Call and review.

Steve Thompson Founder, Atlas Bridge Wealth Cross-Border Planning for UK & Portugal Families

Disclaimer:This article is for general information purposes only and does not constitute financial, tax, or legal advice. Tax treatment and planning outcomes depend on individual circumstances and may change. Readers should seek personalised professional advice before taking action.