UK Mortgages for Expats in Japan

A Real Case: Tokyo to London in 22 Days

Kane had been in Tokyo for eight years, working for the same fintech firm. Salary of ¥16,800,000 a year. A 28% deposit saved. A two-bedroom flat in London at £290,000. On paper, a strong case.

He had already spoken to two lenders before coming to us.

The first declined because his salary arrived in Japanese yen. The second raised concerns about his UK credit file – he had not held an active UK account since 2016.

Neither lender was wrong about the facts. They were just the wrong lenders for the case.

What we found when we looked properly:

• Same employer for five years – continuous, documented, stable
• 28% deposit – comfortably above the minimum most specialist lenders require
• Japanese bank statements showing a clean payment history with no missed payments or returned items
• No UK credit issues – just a thin file from eight years of living abroad

We placed the case with a specialist expat lender experienced in Japan-based applications. They used his Japanese tax documents as proof of income and applied a 12% currency reduction to his JPY salary – at the lower end of the range, reflecting the strength of his overall profile.

The numbers:

Mortgage offer arrived 22 days after submission. The property now rents for approximately £1,100 per month. The mortgage payment sits at around £740.

That gap – £360 per month positive cashflow from day one – came from placing the case with a lender who knew how to read it. Arranged through our buy-to-let mortgage route since Kane was investing rather than moving in himself, the purchase also attracted both stamp duty surcharges – those figures appear below, next to the Bristol example.

A Second Case: A Return Date, Not Just a Return Plan

A wire transfer above ¥30 million doesn’t get blocked under Japan’s foreign exchange law – it just needs a report filed with the Bank of Japan after the fact, a distinction that mattered to a Yokohama-based couple moving their deposit for a £345,000 family home in Bristol. Between them they earned ¥15,200,000 a year, and with a return to the UK expected within around eighteen months, this fell under a residential purchase with a return plan rather than a straight buy-to-let.

Converted at the same trailing-average rate used throughout this page, that salary comes to roughly £79,200. After the usual currency haircut – 15% in their case – the assessable figure drops to £67,320, supporting maximum borrowing of around £302,940 at 4.5 times income. Against a 25% deposit of £86,250, the £258,750 they needed to borrow sat comfortably inside that limit.

Since this will be the only UK property either of them owns, the Bristol purchase carries only the non-resident stamp duty surcharge, not the additional-property layer – the full breakdown for both examples sits in the tax section further down the page. A purchase like this, built around a defined move-back date, is arranged through our expat residential mortgage route.

What You Will Need to Apply

Japan-based applications need more documentation than a standard UK mortgage, but the list is predictable. Get everything in order before any application is submitted – document gaps are the most common reason Japan-based cases stall.

Identity and address:

• Valid UK or British National passport
• Japan address evidence – residence card (在留カード) or utility bill dated within three months

Income evidence:

• Most recent 3 months of payslips – in English or with a certified translation
• Last 2-3 years of Japanese tax returns (確定申告 or 源泉徴収票)
• Last 3-6 months of Japanese bank statements with salary payments clearly visible

Employment:

• Employer letter on company letterhead confirming your role, salary, contract type, and length of service
• If your income includes a GBP allowance or overseas supplement, document this separately – it is assessed at full sterling value with no haircut

Deposit:

• Proof of deposit funds and source – Japanese bank records, brokerage statements, or sale proceeds documentation
• Anti-money laundering checks apply to all cross-border transfers regardless of source country. If you are moving yen to GBP to fund the deposit, expect to evidence the full trail

Self-employed and company directors:

• Two years of Japanese business accounts
• Two years of personal tax returns
• Where income is drawn as salary plus dividends from a Japanese corporation, confirm which figure each lender uses first – that decision alone can shift borrowing capacity by £40,000-£60,000

UK credit:

• Check your UK file via Checkmyfile before the application goes in. Thin is fine. Errors on a thin file are not. Wrong addresses, linked accounts from previous UK tenancies, or settled debts still showing as outstanding can all create unnecessary underwriting questions. For a full breakdown, see our page on expat mortgages with no UK credit score.

The documents that most commonly delay Japan-based applications are certified translations and deposit source evidence. Get both in order before you approach any lender. For a full breakdown of how to structure an application that moves quickly, see our structuring a UK expat mortgage application.

Moving Your Deposit From Japan

A transfer above ¥30 million out of Japan isn’t capped, and it isn’t blocked – Article 55 of Japan’s Foreign Exchange and Foreign Trade Act simply requires the person sending it to file a report with the Bank of Japan once it clears that threshold, for balance-of-payments statistics rather than tax enforcement. Most deposits for a UK property purchase sit below that line entirely, but a larger deposit, or two incomes pooled together, can cross it without anyone intending anything unusual by it.

The report itself is a standard form lodged with the remitting bank, not a delay or an obstacle to the purchase – but it’s worth knowing about before a deposit transfer gets held up by a bank asking questions nobody expected. Combined with the anti-money-laundering documentation every cross-border transfer already needs, keeping records of where deposit funds came from – salary, savings, an inheritance, a property sale in Japan – makes this a formality rather than a hold-up.

UK Tax Obligations for Japan-Based Property Owners

Owning UK rental property while living in Japan creates UK tax obligations that sit alongside your Japanese tax position. This is worth understanding before you buy, not after your first rental payment arrives.

Stamp Duty Land Tax: Two charges can apply to the same purchase, and neither depends on where Japanese tax is paid. Buying while non-UK-resident on completion day – measured in days actually spent in the UK, nothing to do with any Japanese tax registration – adds 2% Stamp Duty Land Tax. A second home rather than the buyer’s only UK property adds a further 5% on top. Kane’s London flat, bought purely as a rental while he stayed in Tokyo, attracted both: £4,500 standard SDLT plus a 7% combined surcharge of £20,300, £24,800 altogether. The Bristol home, the only UK property its Yokohama-based buyers hold, only picked up the 2% element: £7,250 standard SDLT plus £6,900, £14,150 in total. Both surcharges come back if 183 days or more end up spent in the UK during the year after completion, provided the claim goes in within two years.

Non-Resident Landlord scheme: If you receive UK rental income while living abroad, you must register with HMRC’s Non-Resident Landlord (NRL) scheme. Without registration, your letting agent is legally required to deduct 20% from your rental income at source and pay it directly to HMRC. Registration means your rental income arrives in full – any tax owed is settled via self-assessment when you file your UK return.

Registration takes minutes via HMRC’s online portal. Do it before your first tenant moves in.

UK tax on rental income: Rental income from UK property is subject to UK income tax regardless of where you live. The amount you owe depends on your total UK income, allowable expenses, and your personal allowance position as a non-resident. Allowable expenses cover mortgage interest (subject to current rules), agent commissions, repair and upkeep costs, and buildings insurance – all reducible against rental income before tax is calculated.

The UK-Japan Double Tax Agreement: The tax treaty between the UK and Japan prevents the same income being taxed twice. In practice this means rental income taxed in the UK is credited against your Japanese tax liability on that income – you do not pay full tax in both countries. You are still required to report UK-source income to Japanese tax authorities.

Capital gains on sale: If you sell a UK property while resident in Japan, you must report any capital gain to HMRC within 60 days of completion. This applies regardless of where you live at the time of sale.

In practice: This area catches Japan-based landlords out most often on the NRL registration point. The 20% deduction at source is not a penalty – it is a withholding mechanism that HMRC returns via self-assessment once you file. But it creates a cash flow gap that surprises first-time expat landlords who were not expecting it.

Cross-border tax is complex enough that a specialist is worth the cost. Speak to an adviser familiar with both UK property tax and the UK-Japan treaty before you exchange.