Not everyone earns a straightforward salary. If your income includes bonuses, commission, dividends, retained profits, stock options, RSUs, academic stipends, or income from multiple sources, you may find that standard mortgage affordability assessments do not reflect what you actually earn. In Cambridge, where the technology, life sciences, and academic sectors generate a high proportion of non-standard income, this is a common challenge.
This guide explains what counts as complex income, how lenders treat different income types, and why lender selection matters — particularly at Cambridge price points where getting the income assessment right can make a material difference to what you can borrow.
What Counts as Complex Income?
Complex income is any income that does not fit a simple PAYE salary structure. Common types include:
Bonuses and commission. Many lenders will include some or all of your bonus or commission income, but how they calculate it varies. Some use an average of the last two or three years. Others use the most recent year. Some cap the percentage they will include.
Dividends and retained profits. If you are a company director, your income may be structured as a combination of salary, dividends, and retained profits. How lenders treat this varies significantly — see our self-employed mortgages guide for more detail.
Stock options and RSUs. Restricted Stock Units and share options are common in Cambridge’s technology sector. Some lenders will include vested RSUs or exercised options as income, but many do not. The treatment varies by lender and by how the income appears on your payslip or tax return.
Academic income. University staff may receive income from a combination of salary, consultancy fees, research grants, and sabbatical arrangements. Lenders typically focus on the contracted salary, but some will consider additional income streams if they are regular and evidenced.
Multiple income sources. If you have income from employment plus rental income, freelance work, or a second job, not all lenders will aggregate these in the same way. Some require a minimum period of secondary income history before they will include it.
Foreign currency income. If part or all of your income is earned in a foreign currency, some lenders will consider it but may apply a discount to account for exchange rate risk. This is relevant for Cambridge residents who work for international companies or institutions.
Overtime and shift allowances. Regular overtime or shift payments may be included by some lenders, depending on how consistent they are and how they appear on your payslips.
Why Complex Income Matters More in Cambridge
In a lower-priced market, the difference between a lender that includes your bonus and one that does not may not prevent you from buying. In Cambridge, where the average mortgage buyer purchase price is £482,000 (ONS, December 2025, provisional), it can be the difference between affording a suitable property and falling short.
Cambridge’s economy generates a high proportion of complex income. Technology professionals often receive RSUs or share options alongside their salary. Academics may have consultancy income or research stipends. Biotech and pharmaceutical professionals may earn significant bonuses. Company directors in the technology cluster often retain profits in the business rather than drawing them as dividends.
In each of these cases, the income is real — but how a lender assesses it determines how much you can borrow. The right lender choice can make a meaningful difference to your borrowing capacity.
Complex Income Mortgages in Cambridge: How Lenders Assess Your Earnings
Different lenders apply different rules to the same income type. There is no single standard. Some key variations include:
Bonus and commission. Some lenders average the last two or three years. Others use the lower of the last two years. Some cap the proportion of bonus income they will include. A lender that uses a three-year average may produce a very different borrowing figure from one that uses only the most recent year.
Dividends and retained profits. Many high street lenders assess company directors using salary and dividends. Some lenders will also consider retained profits, depending on structure and evidence. This is one of the areas where lender selection makes the biggest difference.
RSUs and stock options. Treatment varies widely. Some lenders will include vested RSUs shown on payslips. Others will not consider equity-based compensation at all. If RSUs form a significant part of your total compensation, this is an area where lender selection matters most.
Foreign currency. Lenders that accept foreign currency income may apply a discount to account for exchange rate risk. The approach varies by lender, currency, and how you are paid.
Why Lender Selection Matters
For applicants with complex income, the lender you apply to can make a larger difference to your borrowing capacity than almost any other factor. Two lenders assessing the same applicant with the same income can produce materially different borrowing figures, depending on how they treat bonuses, dividends, retained profits, or equity compensation.
A broker with experience in complex income cases can identify which lenders are most favourable to your specific income structure and present your application accordingly. Some lenders and private banks are available via intermediaries and do not appear on comparison sites.
What to Prepare Before You Apply
Payslips showing all income components. Ensure your payslips clearly show basic salary, bonus, commission, overtime, and any equity-based payments separately.
P60s or tax returns for the last two to three years. These provide the overall picture of your income over time, including any year-on-year changes.
Evidence of RSUs or stock options. If equity compensation is a significant part of your income, bring vesting schedules, exercise confirmations, or employer statements.
Company accounts if you are a director. Certified accounts showing salary, dividends, and retained profits for the last two to three years.
Evidence of secondary income. Bank statements, contracts, or tax returns showing freelance, consultancy, or rental income.
Frequently Asked Questions
Will lenders include my bonus when calculating how much I can borrow?
Many lenders will include some or all of your bonus income, but how they calculate it varies. Some average over two or three years, others use the most recent year, and some cap the proportion they will include. A mortgage broker can identify which lenders are most favourable for your bonus structure.
Can I use RSUs or stock options to increase my borrowing?
Some lenders will consider vested RSUs or exercised options, but many do not. The treatment depends on how the income appears on your payslip or tax return and the lender’s specific criteria. This is an area where broker advice can make a significant difference.
I am an academic with consultancy income — will lenders include it?
Lenders typically focus on your contracted salary. Some will consider regular consultancy or research income if it is evidenced over a period of time. The position varies by lender, so it is worth having your income assessed by a broker who understands how different lenders treat academic income structures.
What if my income has recently increased?
If your income has risen — for example, through a promotion, a new contract, or increased bonus — some lenders will use your most recent income figure rather than an average. Others will require a longer track record at the higher level. A broker can help you find a lender whose approach benefits your current position.
Next Steps
If your income does not fit a standard mould, the most useful first step is to have it assessed by a broker who understands how different lenders treat complex income. We can review your income structure, identify which lenders are most favourable, and show you what you can borrow before you start your property search.
Visit our Cambridge office to book a consultation, or call 01223 655 579.