Direct answer: establish every income source and currency, the earning country, employer and contract, gross and net amounts, fixed and variable components, payment account, history, tax treatment, expected continuity, property objective, client residence and the currency from which mortgage payments will be made. A current exchange-rate conversion is only a starting point; lender acceptance and any currency reduction determine the usable figure.
Why a Currency Conversion Does Not Establish Affordability
An adviser may convert the client’s salary into sterling and see a strong headline figure. A mortgage lender may first ask whether it accepts that currency, country and income type. It may then apply its own exchange rate or a currency-specific reduction before the usual affordability assessment.
The result can differ materially between lenders. Published criteria demonstrate that one lender may accept selected foreign currencies with a defined reduction, while another may not accept foreign-currency income for purchases, remortgages or further advances at all.
Which parts of the client’s remuneration are paid in which currencies, and which of those parts will a suitable lender actually use?
How Lender Treatment Can Differ
| Assessment point | What can vary | Why it matters |
|---|---|---|
| Currency and country | Accepted lists, restricted jurisdictions and residence requirements. | A valid salary may still sit outside a lender’s appetite. |
| Conversion | Exchange-rate source, timing and percentage reduction or haircut. | The lender’s usable sterling figure may be below the live conversion. |
| Income component | Basic salary, bonus, commission, allowance, equity compensation or pension. | Each component may require a different history or may be excluded. |
| Evidence | Payslips, bank credits, contract, employer letter, tax record and translation. | The amount, currency and continuity need to reconcile across documents. |
| Transaction | Purchase, remortgage, further advance, product change or buy-to-let. | A lender may accept the income for one transaction but not another. |
What Advisers Should Establish
Map the income before converting it
- client’s current and intended country of residence;
- employer, employment country and contractual jurisdiction;
- job title, start date, probation and contract term;
- basic salary amount, currency and payment frequency;
- bonus, commission, allowances and equity-based compensation separately;
- gross and net amounts and relevant deductions;
- account and country into which each payment is made;
- income history and expected continuity;
- whether remuneration will change after relocation;
- other income, liabilities and committed expenditure by currency;
- mortgage purpose, amount, property use and timing;
- deposit currency and source where relevant; and
- the currency or assets expected to fund monthly payments.
A Sterling Mortgage Can Still Be a Foreign-Currency Loan
Under FCA rules, a sterling mortgage is not automatically outside the foreign-currency-loan framework simply because the debt is denominated in pounds. If the mortgage is to be repaid wholly or partly from income or assets in another currency, the regulatory treatment may be relevant.
For an applicable MCD regulated foreign-currency mortgage contract, the lender must provide a right to convert under specified conditions or put other arrangements in place to limit exchange-rate risk. Disclosure rules also address the potential effect of exchange-rate movements.
The broker and lender determine the contractual and regulatory treatment. The international adviser should make the repayment currency clear and should not describe the case as sterling-only when foreign-currency earnings are expected to service the debt.
The mortgage currency, income currency and assets used to repay the debt are separate facts. All three should be identified.
Prepare Evidence That Reconciles Across Borders
A lender may request an employment contract, payslips, corresponding bank statements, employer confirmation, tax documentation and certified translations. The currency, gross pay, net credit, deductions, pay dates and employer name should form one coherent record.
Variable pay may require a longer history than basic salary. A guaranteed allowance should be distinguished from a discretionary payment. If the client has recently changed employer, moved country or altered remuneration currency, the sequence and effective dates should be explained rather than left for underwriting to infer.
Documents should be collected only after the likely route is understood and shared using the secure method Willow specifies.
Illustrative Scenario: Salary, Bonus and Two Currencies
Example only: a British executive in Switzerland wants a £1.1 million UK mortgage.
The client receives a CHF basic salary and an annual USD bonus. A simple conversion produces a high sterling income, but the bonus varies and the property will initially be a second home before the client returns to the UK.
The assessment must separate the two currencies and income components, confirm the Swiss employment and residence position, establish the history and contractual basis of the bonus, identify the post-return remuneration and compare lenders’ accepted currencies, reductions and property-use rules.
The adviser insight: the relevant affordability figure is not “CHF salary plus last USD bonus converted today”. It is the amount a lender can evidence, accept and stress for the actual mortgage and repayment plan.
Keep Exchange-Rate Risk Separate From an Exchange-Rate Forecast
The mortgage assessment should recognise that foreign income can buy more or fewer pounds over time. This is a risk to identify and disclose, not an invitation to predict future exchange rates.
International advisers may coordinate with an appropriately authorised foreign-exchange specialist where relevant. Willow can explain the mortgage consequences, but does not provide currency trading, hedging or exchange-rate advice.
When Foreign-Currency Income Should Trigger a Referral
Involve Willow when:
- the client’s UK borrowing depends on income earned outside sterling;
- income is paid in more than one currency;
- bonus, commission or allowances form a material part of affordability;
- the client is relocating and remuneration will change;
- salary is paid to an offshore or overseas account;
- the employer and residence countries differ;
- income documents are not in English;
- the client has recently started a role or remains in probation;
- an online sterling conversion has been used to set the budget;
- the lender’s accepted-currency policy is unclear;
- the deposit and income arise in different jurisdictions; or
- exchange-rate movement could affect the client’s completion funds or ongoing payments.
Keep the Professional Responsibilities Clear
Willow can assess foreign-currency income for mortgage and property-finance purposes, compare likely lender treatment and explain the evidence required. Willow does not provide tax, legal, immigration, investment, employment or foreign-exchange advice.
The international adviser and other professionals retain responsibility for advice within their own permissions and jurisdictions. A currency conversion or lender illustration should not be treated as a guarantee of borrowing or future affordability.
Lending remains subject to status, valuation, lender criteria and full underwriting.
A Useful First Outline
An anonymous first discussion can include residence, property objective, borrowing amount, employer and contract, basic salary and currency, variable income by type and currency, payment accounts, income history, expected relocation changes, liabilities, deposit and timing.
The purpose is to identify which income can support the mortgage before the client fixes a property budget around an untested sterling equivalent.
Explore More Guidance for International Advisers
Visit the International Adviser Hub for further guidance on expatriates, overseas buyers, foreign-currency income, ownership, private wealth and UK property finance.
Explore the International Adviser HubFrequently Asked Questions
These answers describe general approaches. Current lender criteria and the outcome of a full assessment remain case-specific.
Can foreign-currency income be used for a UK mortgage?
Potentially. Some lenders accept specified currencies and countries, while others do not accept foreign-currency income for new lending. The complete borrower and transaction must meet current criteria.
Will a lender use the full sterling equivalent of the income?
Not necessarily. A lender may apply a currency-specific reduction, use its own exchange rate or restrict particular income components before completing the affordability assessment.
Is a sterling mortgage automatically a foreign-currency loan?
No. The regulatory classification depends in part on whether repayment relies wholly or partly on income or assets in another currency, not simply on the mortgage being denominated in sterling.
Do bonuses and allowances count?
Possibly, but treatment depends on the lender, currency, contractual basis, history and evidence. Basic salary acceptance does not mean every variable component will be used.
What evidence may be required?
Common items can include contracts, payslips, bank statements, tax documents, employer confirmation and certified translations. Exact requirements vary by lender and case.
What if the client is paid in more than one currency?
Each income stream should be separated by source, currency, amount, frequency and evidence. The lender may accept different proportions or exclude one stream entirely.
When should Willow be involved?
Before the client relies on a sterling conversion, commits to a purchase or assumes that a high overseas salary will translate directly into UK mortgage affordability.