A foreign-currency salary can remain exactly the same while its value for UK mortgage purposes changes. With sterling close to its highest level against the dollar since February, borrowers earning in USD and dollar-linked currencies such as AED should not assume an affordability assessment completed several months ago still produces the same result.
Sterling finished Friday, 21 August, on course for a fourth consecutive weekly gain. Reuters reported the pound at around $1.3658, close to its highest level against the US dollar since February.
Against the euro, the picture was very different. Sterling was broadly flat at around 85.66 pence per euro. That distinction matters because this is not a story about every overseas borrower suddenly experiencing the same change in UK mortgage affordability.
It is principally relevant to people whose earnings, bonuses, savings or property deposits are denominated in US dollars or currencies closely linked to the dollar, including the UAE dirham.
Reuters reported sterling at approximately $1.3658 on 21 August, near its highest level since February and heading for a fourth consecutive weekly gain. A stronger pound means each dollar of income or savings converts into fewer pounds.
Why Exchange Rates Can Change Mortgage Affordability
UK mortgage lenders assessing foreign income do not simply look at the number printed on an overseas employment contract.
The income normally has to be translated into sterling for the lender's affordability assessment. Depending on the lender, a further reduction may then be applied to recognise the possibility that exchange rates move against the borrower during the mortgage term.
That means there can effectively be two currency adjustments between a client's overseas salary and the income ultimately used for mortgage affordability.
First, the salary is converted from the original currency into pounds. Secondly, some lenders apply a further currency-risk haircut to that sterling figure.
If sterling strengthens against the currency in which the client is paid, the first part of that calculation can become less favourable even though the client's actual salary has not fallen.
A Dollar Salary Can Be Unchanged While Its Sterling Value Falls
Consider an executive whose contractual salary is fixed in US dollars.
Nothing may have changed professionally. The same employer is paying the same salary and the client's financial circumstances may be fundamentally identical to those that existed several months earlier.
But if the pound now buys more dollars, the same dollar salary buys fewer pounds.
That matters where a lender converts the overseas income using an exchange rate linked to the current market. A mortgage assessment based on an older, weaker sterling exchange rate can therefore overstate the amount of income a lender would recognise today.
This is why foreign-income mortgage affordability is not static. Currency movements can alter the numbers even when employment, remuneration and the proposed property purchase remain unchanged.
Why UAE Dirham Earners Are Particularly Relevant
The UAE dirham is closely linked to the US dollar through its longstanding currency peg. As a result, movements between sterling and the dollar are highly relevant to British expats and other borrowers whose salaries are denominated in AED.
This includes a substantial population of internationally mobile professionals working in Dubai and elsewhere in the UAE who retain UK property, plan to return to Britain or are purchasing UK homes and investment property while overseas.
For these clients, a stronger pound can affect more than headline affordability. It can influence how much overseas capital is required to fund a sterling deposit, the resulting loan-to-value and potentially the overall structure of a transaction.
Santander Currently Applies a 25% Currency-Risk Reduction
The lender methodology makes a significant difference.
Santander's current intermediary residential criteria state that it can consider employed income paid in US dollars, euros, Swiss francs and UAE dirhams.
Its criteria require the foreign income to be converted into its sterling equivalent and then discounted by 25% to allow for currency fluctuations.
This means the exchange rate is only one component of the calculation. Even after the foreign salary has been translated into pounds, Santander applies a further reduction before that income is entered into its mortgage application system.
For a Foreign-Income Mortgage, the Relevant Questions Include:
- which currency the applicant is actually paid in;
- whether the lender accepts that currency;
- which exchange rate the lender uses;
- whether the rate is fixed at a particular stage of the application;
- what currency haircut or stress the lender applies;
- whether bonus, commission or other variable income is also non-sterling;
- whether the borrower is UK resident, an expat or otherwise internationally based;
- where the deposit is held and in which currency;
- whether the lender's criteria fit the client's wider international circumstances.
Halifax Uses a Different Foreign-Income Model
Halifax illustrates why foreign-currency borrowers should not assume every bank will produce the same result.
Halifax's current intermediary criteria accept employed basic salary, bonus, overtime and commission in five non-sterling currencies: US dollars, euros, Australian dollars, Indian rupees and Swiss francs.
Halifax converts the relevant income into pounds and applies a 20% haircut to most eligible non-sterling income. Its published criteria state that the reduction is 10% for bonus income.
There is another important difference. Halifax states that once a Decision in Principle is keyed, the exchange rate used on that application will not then change. The maximum loan should therefore not subsequently move purely because the currency fluctuates.
Before DIP, however, Halifax says its affordability calculation uses current exchange rates, meaning the timing of the assessment can still matter.
AED and USD Are Not Interchangeable Across Lenders
The comparison also exposes an important point for UAE borrowers.
Santander currently lists AED among the foreign currencies it accepts for employed income. Halifax's published list does not include AED.
A borrower paid in Dubai should therefore not assume that a lender accepting US-dollar income will automatically accept UAE-dirham income simply because the currencies are closely linked.
Mortgage criteria are based on the lender's published policy, not simply on the economic relationship between two currencies.
This is precisely why lender selection matters for internationally mobile clients. The differences can concern accepted currencies, residency, employment type, income evidence, currency adjustments and the point at which the lender fixes its exchange rate.
Two lenders can start with the same foreign salary and arrive at different assessable incomes because their accepted currencies, exchange-rate methodology and currency-risk adjustments are different.
Why an Old Decision in Principle May Need Reviewing
The current sterling move is particularly relevant to clients who obtained an initial affordability assessment several months ago but have not yet agreed a property purchase.
An internationally based buyer can spend a considerable period searching for the right UK property. During that time, their salary may remain unchanged while the exchange rate moves materially.
If their previous borrowing estimate was based on a different sterling conversion, it is worth establishing whether the same lender would still produce the same maximum loan today.
The answer depends partly on how far the application has progressed. As Halifax's published policy demonstrates, some lenders can fix the relevant exchange rate once the DIP has been submitted. Before that point, current exchange rates can still affect the calculation.
Other lenders can operate differently, so the precise application stage and lender policy should be checked rather than assumed.
The Deposit Can Move at the Same Time as Affordability
Foreign-income borrowers also need to consider the other side of the transaction: the deposit.
An American buyer purchasing a UK home may have the deposit sitting in dollars. A UAE-based British expat may have accumulated savings in dirhams. If sterling strengthens, those funds translate into fewer pounds.
That can mean more foreign currency has to be transferred to provide the same sterling deposit.
Alternatively, if the client transfers only the amount originally planned, the sterling deposit can be smaller. That may increase the required mortgage or move the transaction into a different LTV band.
This is why the mortgage and FX elements should not be considered independently when the numbers are tight.
A Property Offer Should Be Based on Today's Funding Position
The most important point is timing.
A client making an offer on a UK property needs to understand the funding available under current circumstances, not simply the amount indicated by an affordability assessment produced months earlier.
This becomes particularly important for prime and high-value property transactions where a relatively modest percentage movement in recognised income or deposit value can represent a substantial sterling amount.
A buyer might still be able to complete at the intended price, but the optimal lender, required deposit or structure may have changed.
It Does Not Necessarily Mean the Client Can No Longer Borrow Enough
A less favourable currency conversion from one lender should not be interpreted as a verdict on the whole mortgage market.
Lenders differ significantly in how they treat non-sterling earnings. Some accept only particular currencies. Some apply explicit haircuts. Some have different rules for bonus income. Others may have specialist international or high-value underwriting routes.
The borrower's residency can also fundamentally alter the available market. A UK resident receiving foreign salary is not necessarily assessed through the same lender universe as a British expat living permanently overseas.
For high-net-worth borrowers, private banks and specialist lenders can add further options, particularly where income is only one part of a wider financial profile involving substantial investments, business interests, property assets or international wealth.
Who Should Recheck Their Position Now?
The current sterling move creates the clearest reason to revisit affordability for borrowers whose income or available capital is materially exposed to USD or AED.
A Foreign Income Affordability Recheck May Be Particularly Relevant For:
- US-dollar-paid executives buying or refinancing UK property;
- British expats working in Dubai or elsewhere in the UAE and paid in AED;
- US nationals purchasing homes in Britain;
- international professionals relocating to the UK;
- borrowers receiving substantial non-sterling bonuses or commission;
- returning expats who obtained an affordability assessment earlier in the year;
- clients holding their UK property deposit in dollars or dirhams;
- high-value borrowers whose required mortgage is sensitive to relatively small changes in recognised income.
What Should Be Recalculated?
A useful review needs to go further than checking today's GBP/USD exchange rate.
The first step is to establish the borrower's gross foreign income and the sterling value produced using the relevant lender's methodology. Any lender-specific haircut then needs to be applied before affordability is assessed.
If the deposit is held overseas, its current sterling value should also be checked. The resulting LTV can then be compared with the lender's current product and underwriting limits.
Where a DIP already exists, it is important to establish whether the lender has fixed the exchange rate or whether currency movements could still alter the assessment before the application progresses.
For clients who have not yet reached DIP, the position may warrant recalculation before a binding property decision is made.
How Willow Private Finance Can Help
Willow Private Finance regularly works with British expats, foreign nationals, internationally mobile professionals and high-net-worth borrowers whose income and assets sit across more than one country or currency.
We can assess how different lenders are likely to treat the actual currency in which the client is paid, rather than assuming that a generic sterling conversion represents the mortgage market.
This includes comparing mainstream lenders with specialist international lenders and private banks where appropriate, while considering the client's residency, employment structure, foreign income, deposit position and proposed UK property transaction.
For clients currently looking for property, the objective is straightforward: know what the funding position looks like before making the offer.
Buying or Refinancing UK Property While Living Overseas?
Foreign income, overseas residency and cross-border assets can all affect which UK lenders are available and how much they will lend. If you are paid in USD, AED or another overseas currency, we can assess the mortgage against your current circumstances and compare appropriate international lending options.
Explore UK Property Finance for ExpatsFrequently Asked Questions
Can I get a UK mortgage if I am paid in US dollars?
Potentially. Some UK lenders accept employed income paid in US dollars, but the way that income is converted into sterling and any currency-risk reduction applied can materially affect affordability. Residency, employment status and the wider application also influence which lenders are available.
Can AED income be used for a UK mortgage?
Yes with lenders whose criteria accept UAE-dirham income and where the applicant meets their wider requirements. Santander currently lists AED among the currencies it can consider for employed foreign income and applies a 25% reduction to the sterling equivalent for currency fluctuations. Other lenders have different accepted-currency lists.
Why can a stronger pound reduce my UK mortgage affordability?
If your salary remains fixed in dollars, dirhams or another foreign currency, a stronger pound can mean that salary converts into fewer pounds. Where the lender assesses affordability using the sterling equivalent, the recognised income can therefore fall even though your actual overseas salary has not changed.
Can the exchange rate change after I receive a mortgage Decision in Principle?
It depends on the lender. Halifax currently states that once its DIP is keyed, the exchange rate used on that application will not change, so later currency fluctuations should not alter the maximum loan for that reason. Other lenders can use different processes, so the policy should be checked for the specific application.
Should I recheck my affordability before making an offer on a UK property?
It can be sensible if your income or deposit is held in a foreign currency and your previous assessment was completed using an older exchange rate. The current sterling value, lender haircut, deposit position and resulting LTV can all affect the funding available for the purchase.