Affordability calculator
Mortgage Affordability Calculator
Estimate a practical mortgage range from salary, deposit, interest rate, term and monthly commitments. The goal is not lender approval prediction; it is a realistic salary-to-housing planning view that connects borrowing power with take-home-pay pressure.
Inputs
Estimate your affordability range
Results
Estimated planning result
This estimate suggests the mortgage may be workable if other fixed costs stay controlled and the deposit is not draining emergency savings.
Why take-home pay matters more than gross salary
Mortgage affordability is often introduced through salary multiples, but monthly resilience depends on take-home pay. Income tax, payroll deductions, pensions, student loans, health insurance, childcare, debt payments and transport can all reduce the amount available for housing. A mortgage that looks acceptable against gross salary can feel tight once those costs are included.
How the deposit changes affordability
A larger deposit can reduce the loan size, monthly payment and risk of over-stretching. It can also create more lender options. The tradeoff is that using too much cash for the deposit can leave a household exposed to moving costs, repairs, legal fees, stamp duty or emergency expenses.
Interest-rate sensitivity
Small rate changes can move the monthly payment meaningfully, especially on larger loans. This calculator uses the rate you enter to estimate a repayment-style mortgage payment. It is best used for planning scenarios rather than lender-specific underwriting.
| Scenario | What to test | Why it matters |
|---|---|---|
| Base case | Your expected interest rate | Shows the planning payment you are currently considering. |
| Stress case | Rate 1-2 percentage points higher | Tests whether the budget survives a less favourable market. |
| Deposit case | Higher or lower deposit | Shows how cash upfront changes borrowing pressure. |
Regional and state affordability context
The same salary can support very different housing options across regions. California, New York and London-style markets often require a sharper affordability lens, while lower-cost regions may leave more room for savings and emergency reserves. US users should also consider property tax and insurance; UK users should consider stamp duty, moving costs and mortgage-fee assumptions.
Related affordability guides
How to read the result
Comfortable
The estimated payment leaves room for other fixed costs, savings and normal living expenses.
Moderate
The mortgage may be workable, but debts, childcare or rate rises could change the result.
Stretched
The payment may crowd out savings or make the household too sensitive to income changes.
Mortgage affordability calculator FAQ
How much mortgage can I afford based on salary?
A common planning range starts around three to four-and-a-half times gross income, but the safer answer depends on deposit, interest rate, existing debts and monthly take-home pay.
Should I use gross salary or take-home pay?
Use both. Gross salary helps estimate borrowing range, but take-home pay is better for judging whether the monthly payment is realistic.
Does the calculator include taxes and insurance?
The payment estimate focuses on principal and interest. Users should separately allow for property tax or council tax, insurance, service charges, maintenance and moving costs.
Why does my deposit matter so much?
The deposit reduces the amount borrowed, can improve loan-to-value, and may reduce monthly pressure. It should still leave enough cash for fees, repairs and emergencies.
Is this mortgage advice?
No. It is a planning calculator to help interpret salary and housing costs. Mortgage products and borrowing decisions should be checked with a qualified adviser or lender.
Use the rent affordability calculator
For rental planning, use the calculator to test salary, monthly take-home pay, rent percentage, bills and fixed commitments before deciding whether a rent level is workable.
Use the disposable income calculator
To see what remains after housing, bills, transport, childcare, debt and planned savings, use the take-home pay after housing calculator.
Use the stamp duty calculator
To estimate the upfront tax cost on an England or Northern Ireland property purchase, use the stamp duty calculator alongside deposit and moving-cost planning.
Use the salary needed calculator
To reverse the affordability question, use the calculator to start with a target house price and estimate the income range, deposit pressure and monthly payment.
Use the monthly budget calculator
Before relying on a mortgage payment estimate, use the monthly budget calculator to see how housing fits with bills, essentials, savings and other recurring costs.
Use the debt-to-income calculator
Before treating a mortgage payment as workable, use the debt-to-income calculator to see how existing repayments affect monthly room.
Browse related planning calculators
For deposit, stamp duty, monthly budget and debt-ratio tools around housing decisions, use the calculator hub to choose the next planning route.
Using the estimate in a real budget
A calculator result is most useful when it is connected to a decision: rent level, mortgage pressure, savings capacity, relocation value or monthly cash-flow room. Treat the output as a planning range rather than a final answer.
Inputs such as local costs, tax assumptions, payroll timing, debt repayments and household commitments can change the practical outcome. The best next step is to compare the estimate with real bills and payslip figures. For transparency, use the methodology and tax assumptions pages alongside the result.
| Question | What to check | Why it matters |
|---|---|---|
| Decision point | Identify the cost or income choice being tested. | The result should clarify a tradeoff, not replace judgement. |
| Assumption check | Review tax, housing, bills and savings inputs. | Small optimistic inputs can make a stretched budget look comfortable. |
| Practical use | Compare the estimate with real income, bills and commitments. | The page should support planning, not create a false sense of precision. |
| Planning lens | Useful when | Related next step |
|---|---|---|
| Income clarity | You need to separate gross pay from usable net income. | Review gross vs net pay. |
| Assumption check | The result differs from a payslip, quote or lender view. | Read the tax assumptions. |
| Budget pressure | Housing, transport or debt costs change the practical outcome. | Use the monthly budget calculator. |