Mortgage calculators are popular, but in 2026 they often give a false sense of certainty. While useful for rough estimates, they do not reflect how lenders actually assess affordability.
Why Calculators Oversimplify Borrowing
Most calculators rely on basic income multiples and ignore spending patterns, stress testing, and lender-specific rules.
They Ignore Real-World Outgoings
Car finance, childcare, subscriptions, and lifestyle costs are rarely factored in properly.
Stress Testing Is Not Included
Lenders assess affordability at higher hypothetical interest rates, which calculators do not show.
Credit Behaviour Is Overlooked
Calculators assume perfect credit behaviour, but lenders analyse trends, not just scores.
Property Type Is Ignored
Lease length, service charges, and construction type can all affect borrowing, yet calculators assume every property is the same.
How to Use Calculators Properly
Calculators are best used as a starting point, not a decision-making tool.
Speak to NexGen Finance for a Realistic Assessment
NexGen Finance can help you move beyond estimates and understand realistic mortgage options by introducing you to an authorised adviser where appropriate.