Calculate Your
Mortgage Affordability

Mortgage affordability isn't just about income multiples. UK lenders conduct comprehensive assessments that include stress testing at higher interest rates, detailed budget analysis, and tax calculations. Our calculator mirrors real lender practices to give you an accurate picture of what you can actually borrow.

FCA Stress Testing Requirements

Since 2014, UK lenders must stress test your affordability at higher interest rates (typically 3% above the actual rate, or minimum 7% total). This ensures you could still afford payments if rates rise. Our calculator applies these same stress tests to show you realistic borrowing limits.

Why Net Income Matters

While lenders use gross income for the 4.5x income multiple, they calculate your actual affordability using net income (after tax and National Insurance). Our calculator automatically deducts UK tax and NI to show you realistic monthly budget figures.

Living Expenses and Disposable Income

Lenders don't just look at debt commitments - they consider all your monthly living expenses (utilities, food, council tax, transport, etc.). We use ONS average household data as defaults, but you can customize based on your actual situation.