Expat Guide to UK Property: Sell, Hold or Pass On

Introduction

It's a conversation we have often. You spent your working years in London, got onto the property ladder, built up some equity. Then life moved on – back to New Zealand, or back to Australia. The flat stayed behind, ticking along as a rental, paying down its mortgage, occasionally serving as a European base for the family. Now you're looking at it differently. The market is what it is. The pound is what it is. One of the kids could probably do something with it. Your accountant has mentioned something about inheritance tax. And the question that keeps circling is this: do I sell it, hold it, or pass it on?

For Kiwi and Aussie expats with UK property, this is rarely a clean financial decision. It's a tax question, an emotional question, a family question, and an FX question all at the same time. The right answer depends on numbers you haven't yet run, on rules that have changed in the last eighteen months, and on at least two tax systems looking over your shoulder.

This guide walks through the three real options – sell, hold, or pass on – with the actual numbers and the practical traps each one carries. It's written for expats who left the UK some years ago (or for those thinking of leaving a property behind in the UK when they leave) and now find themselves making this decision from across the world. Some of it's technical. Most of it's decision-making. The aim isn't to tell you what to do. It's to help you make a choice you won't regret.

Let's start with why this is rarely as straightforward as it looks, and then take each option in turn.

Why this is rarely a clean decision

The instinct, when you start thinking about selling a UK property from across the world, is to ring the accountant and ask what the tax bill will be. Fair enough. We all know there is Capital Gains Tax in the UK, and it applies regardless of whether you are UK tax resident or not - but as you get into this, you'll find there are a few more layers.

Two tax systems looking at you at once. The UK taxes rent and gains from UK land regardless of where the owner lives, on the basis that the property sits on UK soil. New Zealand and Australia tax their residents on worldwide income, with foreign tax credit relief where the same income has already been taxed in the UK. The UK–New Zealand and UK–Australia tax treaties broadly tidy this up for income tax and capital gains tax. They do not, however, cover UK inheritance tax. So a treaty that keeps your rental income from being taxed twice in your lifetime does nothing to shield UK property from UK IHT when you die.

The mortgage layer. If the property still carries a loan, almost every option you might consider – gift it, transfer it into a trust, restructure it between spouses, even some refinances while keeping it – is a mortgage-variation event in the lender's eyes. That means lender consent, fresh affordability checks, and sometimes a flat refusal because the lender doesn't permit transfers of equity on buy-to-let mortgages at all. Early repayment charges sit there too, waiting to be triggered if the loan is repaid outside the fixed-term rules. And there's a quiet SDLT trap sitting alongside all of this if a gift is on the table – we'll come back to it in the gifting section.

The FX layer. The pound against the New Zealand dollar, or against the Australian dollar, can move 10% or more in a year on news that has nothing to do with you. The date that is best for tax is rarely the date that is best for FX, and treating them as the same decision can leave money on the table.

The family layer. The flat isn't just an asset on a spreadsheet. One of the kids might want to use it. Another might want the cash. A third might not yet know they care. The decision tends to ripple out through the family in ways a clean financial calculation can't pre-empt. Keeping a family property in the UK sounds great, and with property prices and rental costs where they are, your family may love you for it. Just make sure the tax consequences are understood.

The market layer. London prices have done what they have done. UK landlord reforms have made being an overseas landlord noticeably harder than it was even three years ago. The yield you remember from when you first let the flat out is may not be the yield you will earn this year, even before the new compliance costs are added on top.

None of this means there is a wrong choice. It does mean there is no single right one, and that the answer for you depends on more than the tax bill alone, but because we are here to talk about tax, that's what we are going to do :)

This piece is therefore not built to tell you what to do. It is built to walk through each option clearly, with the numbers and the practical traps, so you can see your own situation better and make a decision you can live with.

Option 1: Sell

Selling is the cleanest of the three options in some ways. You crystallise the gain, take the cash, pay the tax, and move on. There's the UK CGT regime for non-residents to be aware of, and a key valuation date that can be helpful, along with a reporting deadline that runs faster than most expect.

When you sell UK residential property, the UK can tax the gain regardless of where you live. That used to work differently – for many years, non-residents fell outside the UK CGT net on UK property altogether. That changed on 6 April 2015. Since then, non-residents have been chargeable on gains from UK residential property. So if you're a New Zealand or Australian tax resident selling a London flat today, you're inside the UK CGT regime by default, whether you've lived in the UK in the last decade or not.

The 5 April 2015 rebasing point

For many expats who owned their UK residential property before April 2015, the starting point is usually the property’s market value at 5 April 2015, rather than the original purchase price.

That rebasing only works, of course, if you can actually prove what the property was worth on that date. Which means a defensible valuation. If you bought your London flat in 2002 and it's grown steadily ever since, that 2015 valuation is doing more work for you than you might realise.

In practice: if you purchased the property before April 2015 then get a retrospective professional valuation done, keep it in your bottom drawer, and don't lose the paperwork.

Tax Rates and the annual exempt amount

UK CGT on residential property is currently charged at 18% to the extent the taxable gain falls within your unused basic-rate band, and 24% above that. For 2026/27, the basic-rate band is £37,700, so if you have no UK income, up to £37,700 of taxable residential property gain may be taxed at 18%, with the balance taxed at 24%. There is also a £3,000 annual exempt amount (think of it as a tax free capital gains allowance).

Allowable costs

You can deduct the original acquisition cost, or the 5 April 2015 rebased value where that method is used, together with allowable disposal costs and qualifying capital improvements. The detail matters, especially where improvement costs were incurred before the rebasing date. The trap is the line between "improvement" and "repair". A new kitchen of materially better quality is capital. Replacing a kitchen with a like-for-like kitchen is a repair. Adding a loft conversion is capital. Replacing a roof, fixing the boiler, redecorating – all repairs.

Working through the numbers

Let's run the numbers on a typical scenario. Assume:

1. Sale price in 2026: £700,000
2. Selling costs (agent and legal fees): £15,000
3. 5 April 2015 market value: £450,000
4. Capital improvement since 2015 (loft conversion): £30,000
5. Mortgage to redeem on sale: £200,000

The CGT computation:

1. Net disposal proceeds: £700,000 – £15,000 = £685,000
2. Less 2015 rebased cost: £450,000
3. Less capital improvement: £30,000
4. Gross chargeable gain: £205,000
5. Less annual exempt amount: £3,000
6. Taxable gain: £202,000

The taxable gain is then taxed as follows:

1. First £37,700 taxed at 18% = £6,786
2. Remaining £164,300 taxed at 24% = £39,432

Total UK CGT: £46,218

And the cash position on completion:

1. Sale proceeds: £700,000
2. Less selling costs: £15,000
3. Less mortgage redemption: £200,000
4. Less UK CGT: £46,218
5. Net cash retained: £438,782

That last number is the one to start your NZ or Australian budgeting from. Not the £700,000 headline sale price, and not the £500,000 after the mortgage clears. The post-tax, post-cost number.

Reporting: the 60-day deadline

HMRC requires a non-resident property disposal to be reported within 60 days of completion, with any CGT also payable within that window. This is separate from your annual Self Assessment return and runs on a much shorter clock.

The reporting requirement applies even if no tax is due. Gains within the annual exempt amount, losses, disposals where reliefs cover everything – the property return still needs to be filed on time. Missing this deadline triggers automatic penalties, which compound monthly.

The New Zealand overlay

For New Zealand tax residents, the position is not quite “no NZ capital gains tax, so no NZ tax”. New Zealand does not have a broad capital gains tax, but it does have the bright-line rule, which can potentially apply to overseas residential property as well as New Zealand property. The bright-line rule has changed several times since it was introduced in 2015, so the relevant period depends on when the property was acquired, not simply the rules in place today.

For long-held UK properties, this often means the bright-line rule is not the issue, but the point should still be checked where the property was acquired more recently or where residence has changed during ownership.

The Australia overlay

Australian tax residents are generally taxed on worldwide capital gains, so a UK property sale may need to be reported in Australia as well as in the UK. For individuals, a 50% CGT discount may be available where the asset has been held for more than 12 months, although the Australian calculation must be done under Australian rules, not simply by copying the UK CGT computation.

That means the cost base, timing, allowable costs, exchange rates and any main residence history may all need to be considered separately. Where UK CGT has been paid on the same gain, an Australian foreign income tax offset may be available, but it needs to be calculated under Australian rules and may not match the UK tax paid exactly.

FX is a separate decision

The £438,782 in the worked example is the sterling number once UK tax is settled. What you actually end up with in NZ or Australian dollars depends on the rate on the day you convert. That's a treasury decision, not a tax decision, and it has its own section later in this piece.

Option 2: Hold

If you don't need to crystallise the cash and the property is broadly paying for itself, holding has obvious appeal. You keep the asset, the family may use it later, the mortgage continues to pay itself down, and you sidestep the UK CGT computation for now.

The catch is that the cost of holding a UK rental from overseas has gone up materially over the last few years. The compliance load is heavier, the tax treatment of mortgage interest is less generous than it once was, and from 2026 onwards Making Tax Digital for Income Tax adds a fresh layer to the work. its worth running through each one before you commit to another five or ten years as an overseas landlord.

The Non-Resident Landlord Scheme

If you live overseas and your UK property is rented out, your letting agent (or your tenant directly, if there is no agent) is required to deduct basic-rate income tax at 20% from the rent and pay it across to HMRC. That deduction happens before you see the money.

You can apply to HMRC for approval to receive rent gross, using form NRL1 for an individual landlord. Approval doesn't make the rent tax-free – you still declare the income through your annual UK Self Assessment return – but it does fix the cashflow problem of having 20% withheld at source. Most expat landlords with a clean compliance history get gross-payment approval without difficulty.

The finance cost restriction

For UK residential landlords who are individuals, mortgage interest is no longer a deductible expense in calculating rental profit. Instead, you get a basic-rate (20%) tax reduction on the interest paid.

In practice, that means two things. Highly geared landlords can look profitable for tax purposes when their actual cashflow is thin or even negative. And higher-rate taxpayers no longer get full relief on their mortgage interest, only the 20% tax credit.

Making Tax Digital for Income Tax

From 6 April 2026, landlords (and self-employed individuals) with qualifying income (note income, not profit) above £50,000 are required to keep digital records and submit quarterly updates to HMRC using MTD-compatible software. The threshold drops to £30,000 from April 2027, and £20,000 from April 2028.

Many expat landlords with UK rental income will be brought into MTD as the thresholds fall, particularly where gross rents exceed £30,000 or £20,000. The test is based on qualifying income, not profit, so check the gross rental figures rather than the net cashflow. Quarterly digital updates aren't particularly onerous in themselves – it's largely a matter of having the right software in place – but they do change what "good enough" bookkeeping looks like for overseas owners. If you're not currently using MTD-compatible software (such as our own Joy Pilot accounting software), this is the right time to look at it.

The New Zealand overlay

For New Zealand tax residents, the UK rental income is also taxable in New Zealand. You declare it on your IR3, and you can typically claim a foreign tax credit for UK tax paid on the same income.

New Zealand's ring-fencing rules for residential rental losses mean that a loss on the UK property generally can't be offset against your other New Zealand income. The loss gets carried forward against future rental profit instead. For expats who are running at a paper loss after the UK finance cost restriction, this is worth modelling – the position can look quite different on the two sides of the world.

The Australia overlay

Australian tax residents declare the UK rental income on their Australian return, with the deductions calculated under Australian rules (not simply transposed from the UK figures). Where UK tax has been paid on the same income, a foreign income tax offset may be available, though, as with the CGT picture, the offset rarely matches the UK liability exactly.

Australia does not ring-fence residential rental losses in quite the same way New Zealand does. Negative gearing is generally permitted, subject to the usual rules, so the cashflow profile from an Australian taxpayer's perspective can look different from the NZ position even when the underlying property is the same.

Is the yield still worth the work?

This is the honest question to put alongside the technical detail. Add up the UK income tax (now bumped by the finance cost restriction), the NZ or Australian overlay, the management fees, the compliance time, and the new MTD and tenancy-reform burden. Then run the result against the actual cash the property is generating after the mortgage is paid.

For many expat landlords, the net yield isn't dramatically negative – but it isn't as attractive as it once was either. We've spoken with a number of clients recently for whom the compliance load alone was the reason they decided to sell rather than carry the property forward.

Option 3: Pass it on

The "pass it on" option is emotionally attractive. Keep the property in the family, give the kids a head start, sidestep an eventual UK inheritance tax bill, maybe even end up with a London base for the grandchildren one day. The mechanics, unfortunately, are more complex than the idea.

Estate planning, IHT, gifting and trust structures all sit firmly in specialist territory – the kind of territory where one small detail can flip the outcome. What follows is the shape of the decision, not a planning template. Anyone seriously considering a gift or a trust transfer should get formal advice before they act.

UK IHT applies, regardless of where you live

UK Inheritance Tax follows the property, not the owner. As long as the residential property sits on UK soil, it is within scope for UK IHT on death, even if you have been a New Zealand or Australian tax resident for the last twenty years.

There is no UK–New Zealand or UK–Australia inheritance tax treaty. The income tax and CGT treaties do not cover IHT. So a treaty that keeps your rental income from being taxed twice in your lifetime does nothing to shield UK property from UK IHT.

The headline framework: a £325,000 nil-rate band, plus up to £175,000 of residence nil-rate band if the property was at some point your residence AND passes to direct descendants. Pure investment property held only as a buy-to-let typically does not qualify for the residence nil-rate band.

The UK IHT landscape also shifted materially in April 2025. For more on those changes, see our 2025 inheritance changes blog.

The basic gifting mechanics

Gifting the property outright to an adult child is treated as a Potentially Exempt Transfer (PET) for IHT purposes. If you survive seven years from the date of the gift, the property drops out of your estate. If you die within seven years, it gets pulled back in.

Taper relief is narrower than most families think. It only applies after three years, and it reduces the tax on the failed PET, not the value of the gift. A death within three years of the gift gives no taper relief at all.

There is also a separate CGT issue. Because parent and child are "connected parties", an outright gift is treated as a disposal at market value for UK CGT. The donor can trigger a real UK CGT bill on the overall gain, with no sale proceeds to help fund it, potentially creating a cashflow issue.

Watch the mortgage SDLT trap

A gift with a mortgage attached isn't always SDLT-free. A pure gift of UK property with no mortgage and no other consideration usually doesn't trigger SDLT. But if the child takes over the mortgage, the amount of debt assumed can count as "chargeable consideration" for SDLT, and SDLT may apply on that debt.

A worked example: a £900,000 property with a £400,000 mortgage is gifted to a child who takes over the mortgage. The SDLT calculation is based on the £400,000 debt assumed, not the £900,000 market value. The CGT calculation, by contrast, still uses the £900,000 market value (because of the connected-party rule above). Different rule, different number, on the same transaction.

Gift with reservation

If you give the property away but keep benefiting from it – living in it on holidays, taking the rental income, having full use of it without paying full market rent – HMRC's gift with reservation rules pull it back into your estate. The gift, for IHT purposes, never really happened.

The mortgage lender perspective

Even if the tax planning works, the lender has its own say. Any change of title on a mortgaged property is a mortgage event – the lender needs to consent, the new owner faces an affordability reassessment, and some lenders won't permit transfer of equity on buy-to-let mortgages at all. Early repayment charges may also bite if the loan ends up being repaid outside its fixed-term rules.

What about trusts?

Trusts can sometimes solve succession problems that an outright gift can't. They can also add registration obligations, ongoing administration, and a layer of UK-and-NZ-or-Australian-side compliance work that materially changes the economics.

Trust planning is specialist territory. UK Trust Registration Service obligations, New Zealand settlor disclosure rules, foreign trust classification, beneficiary taxation – any of these can flip the outcome. This is one of those areas where the right answer almost always involves a specialist trust lawyer and a tax adviser working together.

The honest summary

The pass-it-on route is the most legally and practically complex of the three options. It has the most variables, the most professional advisers involved, and the highest risk of an unintended tax bill landing somewhere unexpected.

That doesn't make it wrong. For some families, it's the right answer. But unlike the sell option (where the planning is mostly procedural) or the hold option (where the planning is mostly ongoing), the pass-it-on route really benefits from proper specialist advice before any documents are signed.

If you gift the property, it has no mortgage, you don't reserve any benefit from it, and you don't die within seven years – happy days!

The bottom line

Three options, three different shapes of trade-off.

Selling is the cleanest of the three. You get a defined tax computation, a defined reporting deadline, and a defined amount of cash at the end. The planning work is mostly procedural: get the 2015 valuation if needed, brief the conveyancer, line up the accountants on both sides. If you need liquidity, want certainty, or are tired of carrying the compliance load of an overseas rental, this is the option that pays back fastest.

Holding has obvious appeal if the property is broadly paying for itself and the family enjoys having it in the background. But the carrying cost has gone up materially – finance cost restriction, MTD for Income Tax, plus the NZ or Australian overlay on the rental income. The net yield isn't always what the headline gross figure suggests. For many of our clients, the compliance burden alone is a meaningful factor.

Passing it on is the most legally complex. It can also be the most rewarding when it works, but it has the highest risk of an unintended tax bill landing somewhere unexpected. CGT at market value, the gift-with-reservation trap, the mortgage SDLT trap, and the lender's right of veto all sit in the way. Specialist advice is genuinely essential here, not just a polite suggestion.

When clients sit down with us to work through this, the conversation usually anchors on the same four questions:

1. Do you need the cash? If yes, lean towards sell. If no, you have more room to think about the other two.
2. Is there meaningful UK IHT exposure if the property stays in your estate? If yes, "pass it on" deserves a proper look. If no, the case for early gifting is weaker.
3. Is the property actually cash-generative after all the layers? UK tax, NZ or Australian overlay, mortgage interest, management fees, compliance time. If the honest answer is "no", "hold" is probably the wrong answer.
4. Are there any lender constraints? Especially relevant if you're considering a gift or transfer. The lender can veto the plan even when the tax planning works.

One thing worth a passing mention before we wrap up. FX matters whichever option you choose. The pound's strength against the New Zealand or Australian dollar shapes the cash you actually take home. It's a dollars decision rather than a tax one, and it's worth keeping in mind.

If you've read this far, you probably already know which way you're leaning. What you're looking for now is some reassurance that it's the right call for your situation – and a sense of what the practical next steps look like.

That's a conversation worth having sooner rather than later, especially if a mortgage fixed-term is about to renew, a tenancy is coming up for renegotiation, or family circumstances are shifting.

We've been guiding Kiwi and Aussie contractors and small business owners through the UK tax system for over twenty years. We can handle the UK accounting and tax side – CGT computations, rental compliance, MTD setup, Self Assessment, all the things in our wheelhouse. For formal estate planning, gifting strategy, trust advice, we work with specialist advisers we know and trust, and we're happy to introduce you.

Get in touch with No Worries Accounting No obligation, no sales pitch. Mostly. 🙂