Affordability remains one of the biggest pressures shaping today’s mortgage market, but as Nichola Bell, Strategic Partnership Manager at Saffron for Intermediaries, explains in the following exclusive, focusing solely on interest rates or short-term volatility misses a deeper shift.
With more borrowers building income from multiple sources rather than a single salary, understanding affordability now requires a nuanced, forward-looking approach. For brokers, this means assessing not just whether a client can afford a mortgage today, but how their diverse income streams may sustain repayments as market conditions evolve.
Affordability remains one of the biggest pressures shaping today’s mortgage market, but focusing solely on higher interest rates or short-term volatility risks overlooking a more fundamental shift. The way people earn has changed, and with it, the way affordability is assessed.
In a rising rate environment, income is no longer linear. Understanding affordability now means understanding how income is built, how it interacts, and how it may adapt over time.
For brokers, this calls for a shift in mindset, moving beyond traditional salary multiples and rigid stress tests. A more complete, nuanced view of income is now at the heart of assessing not just whether a client can afford a mortgage today, but whether that affordability will hold as market conditions evolve.
The diversification of the modern borrower
The traditional single-income applicant is no longer the default. More borrowers are moving away from the standard nine-to-five model towards what could be described as portfolio careers, combining multiple income streams to create financial stability.
In 2026, around 46% of UK adults have an additional source of income, rising to 62% among Millennials. At the same time, employment patterns continue to shift, with around 4.38 million self-employed workers in the UK as of the end of last year.
The result is a new type of borrower, one whose financial strength is built on a combination of income sources rather than a single, predictable salary. When properly understood and evidenced, this diversification can provide a natural hedge against income shocks.
Where affordability models fall short
While borrower behaviour has evolved, affordability models have not always kept pace. Many assessments still favour straightforward, salaried income, making it harder for those with multiple or variable earnings to demonstrate their true financial position.
This creates a growing disconnect. A client with a steady income supplemented by freelance work, dividends or rental income may, in reality, be more resilient than a single-income borrower. Yet on paper, they can appear more complex or even higher risk.
In a higher-rate environment, this gap becomes more pronounced. Tighter criteria and stress testing can disproportionately affect those with non-standard income, even where their overall financial position is strong. As a result, clients who could sustainably manage repayments may be constrained by models that fail to capture the full picture.
The broker’s role
As income becomes more complex, the broker’s role becomes more valuable. Supporting affordability today means going beyond a snapshot of income and building a forward-looking view of how a client’s finances will perform over time.
This includes understanding how income is layered across life stages. Younger borrowers may combine salaried roles with freelance or entrepreneurial work, while more established clients may draw on assets such as property, investments or business interests. From hybrid professionals to micro-entrepreneurs, income is increasingly diversified, and understanding how those layers interact is key to structuring sustainable borrowing.
Stronger client relationships are central to this. Borrowers are far more likely to disclose secondary or irregular income when trust is established, enabling brokers to present a more accurate and complete case. It also opens the door to better forward planning, whether that is supporting business growth, evolving income streams or preparing for future rate changes.
Crucially, brokers should be actively structuring cases with resilience in mind. This means combining income streams where appropriate, aligning applications with stronger earning periods, and stress testing affordability beyond minimum lender requirements. It also means considering how product choice, term length and repayment structure can help clients manage costs as interest rates rise or fluctuate.
Working with lenders who understand complexity
As borrower profiles evolve, the importance of working with lenders who understand non-standard income is becoming increasingly clear.
At Saffron, we recognise that modern income does not always fit traditional models. That is why our approach is built around supporting complex and evolving income profiles. Simplified documentation, manual underwriting and case-by-case assessment help brokers place more nuanced cases, particularly in a higher-rate environment.
As the mortgage market continues to evolve, affordability must reflect how people live, work and earn today – and how those factors stand up to change. Brokers who embrace this shift, by taking a more holistic view of income, structuring cases with future resilience in mind, and working with lenders equipped for complexity, will be best placed to help clients navigate affordability and market volatility with confidence.
