What Is Complex Income?
Complex income refers to any income structure that does not conform to the simple PAYE payslip format that most standard mortgage lenders are built around. The category is broader than many borrowers realise - it encompasses not just the self-employed and company directors, but also contractors, city professionals with significant bonus, equity partners in law and accountancy firms, hedge fund managers with carried interest, and technology executives with RSU and ESPP compensation.
The challenge of complex income mortgage applications is not that these borrowers are less creditworthy - many are significantly more affluent and financially secure than equivalent PAYE borrowers. The challenge is that their income does not appear in the format that standard underwriting systems expect, and automated credit models systematically undervalue it.
Income Type Assessment Guide
How an income type is treated varies enormously between standard lenders and specialists. The table below compares the two approaches and the potential uplift in available borrowing where a specialist assessment applies.
| Income Type | Standard Lender Assessment | Specialist Lender Assessment | Potential Uplift |
|---|---|---|---|
| Sole trader net profit | 2-year average of SA302 net profit | Most recent year's SA302 (for growing income) | Significant where income is growing |
| Ltd Co salary + dividends | Combined S+D drawn in last 2 years | Director's share of net company profit | Up to 3-5x more than S+D alone |
| Contractor day rate | Employed salary from payslips | Annualised day rate (rate x 230 working days) | Often 2-3x more than payslip income |
| Employment bonus | 50-75% of 2-year average bonus | 100% of regular bonus; 75% discretionary | 15-40% more borrowing |
| Carried interest | Often excluded entirely | Income averaging with track record evidence | Can unlock very large loan sizes |
| RSUs / equity comp | Vested RSUs at market value; unvested excluded | Specialist private bank assessment | Valuable for senior tech/finance executives |
| Partnership profit share | Sometimes not included; often discounted | Full profit share including equity element | Material for law/accounting partners |
| Investment income | Excluded by most lenders | Included by specialist and private bank lenders | Significant for HNW borrowers |
The Lender Spectrum for Complex Income
Complex income mortgage lenders operate across three tiers, each suited to different income complexity and loan sizes:
Tier 1 - Specialist Building Societies
Bath Building Society, Buckinghamshire Building Society, Cambridge Building Society, and several other mutual lenders have developed expertise in one or two complex income types - particularly self-employed and contractor income. Good for loan sizes up to £500,000-£1m with specific income types.
Tier 2 - Specialist Residential Lenders
Kensington Mortgages, Pepper Home Loans, Vida Homeloans, and similar specialist lenders handle a broader range of complex income types and can accommodate adverse credit alongside complex income. Active in the £200,000-£2m range.
Tier 3 - Private Banks
Coutts, Arbuthnot Latham, Investec, Hampden & Co, and C. Hoare & Co provide bespoke underwriting for the full range of complex income types at high loan sizes. No income multiple constraints - total wealth assessment. Best for loan sizes above £2m or income profiles that no structured product can accommodate.
Case Types We Regularly Place
Complex income cases come in many forms. These are the profiles we place most often and the kind of lender that typically takes them.
- Self-employed borrowers with one year of accounts - placed with specialist building societies and lenders accepting latest year assessment
- Company directors with retained profit significantly above personal drawings - placed with net profit assessment lenders
- IT and professional contractors on day rates - placed with lenders using annualised rate calculation
- City professionals with 50%+ of income from discretionary bonus - placed with specialist income lenders recognising full bonus history
- Private equity professionals with carried interest - placed through private banking relationships
- Newly self-employed from high-income employment - placed using prior employment evidence alongside early self-employment data
- Locum doctors and dentists with multiple income sources - placed with healthcare-specialist mortgage lenders