Mortgage Affordability Checks Before You Apply: Affordability is the centre of a mortgage application.
A lender is not only asking whether you can afford the mortgage today. It may also consider whether the mortgage could remain manageable if your circumstances or interest rates change.
This is why mortgage readiness starts before the application form.
The more clearly you understand your income, spending and commitments, the easier it becomes to approach the right lender with the right evidence.
Quick Answer
Mortgage affordability checks review whether the mortgage appears affordable based on your income, spending, debts, dependants, deposit, mortgage term and lender criteria.
A lender may also consider whether future changes could affect repayments.
Before applying, read our guide on getting mortgage ready.
What Is Mortgage Affordability?
Mortgage affordability is a lender’s assessment of whether you can reasonably afford the mortgage.
It is not only based on salary. It may include:
- Income
- Regular spending
- Credit commitments
- Dependants
- Deposit size
- Property value
- Mortgage term
- Interest rate
- Future payment risk
- Credit history
Different lenders use different calculations. This is why one lender may decline a case that another lender may consider.
Income Used in Affordability
The income used by a lender depends on your circumstances.
For employed applicants, a lender may consider basic salary, overtime, bonus, commission or allowances. However, not all variable income will be used in full.
For self-employed applicants, lenders may look at net profit, salary and dividends, share of partnership profit, retained profit or accounts, depending on the business structure and lender criteria.
For some applicants, income may also include pension income, benefit income, maintenance or rental income.
The question is not only what you receive. It is what the lender is prepared to use.
Spending and Commitments
Lenders may review regular spending and committed costs.
These may include:
- Credit cards
- Personal loans
- Car finance
- Student loans
- Childcare
- Maintenance payments
- Ground rent or service charge
- Existing mortgage payments
- Rent
- Insurance
- Household bills
Some costs are fixed. Others are estimated through lender models. Either way, spending affects how much may be available for the mortgage payment.
Credit Commitments
Credit commitments can reduce affordability.
This includes loans, credit cards, car finance, store cards and other borrowing. Even if you manage the payments well, the lender may include them in the affordability calculation.
Credit card balances can also matter. Some lenders assess the monthly cost based on the balance, even if the actual minimum payment is lower.
Before applying, check whether any credit could be repaid or reduced. Do not repay debts without advice if it would leave you short of deposit or moving costs.
Dependants and Household Costs
Dependants can affect affordability because they may increase household expenditure.
This can include children, adults financially dependent on you, or other regular support commitments.
Lenders may also consider childcare, school fees or maintenance payments.
This is not a judgement on family life. It is part of assessing whether the mortgage payment fits the household budget.
Deposit and Loan-to-Value
The size of your deposit affects the loan-to-value.
Loan-to-value, often called LTV, compares the mortgage amount with the property value. For example, a £180,000 mortgage on a £200,000 property is 90% LTV.
Lower LTV may give access to more mortgage options. Higher LTV can mean stricter criteria or higher rates.
Use the Mortgage Calculator to test different borrowing amounts and monthly payments.
Mortgage Term
The mortgage term also affects affordability.
A longer term may reduce the monthly payment. However, it can increase the total amount of interest paid over the life of the mortgage.
A shorter term may reduce total interest, but the monthly payment will usually be higher.
The right term should be reviewed against age, income, retirement plans, property goals and monthly budget.
Interest Rates and Payment Planning
Interest rates affect monthly repayments.
A mortgage that looks affordable at one rate may become harder if rates rise or if a fixed-rate deal ends in future. Lenders may therefore consider whether the mortgage still appears affordable under their assessment rules.
This is why payment planning matters.
Look beyond the first monthly payment. Consider what could happen when the deal ends, income changes or other costs rise.
First-Time Buyer Affordability
First-time buyers often focus on deposit size first.
Deposit matters, but affordability is just as important. A lender will still assess income, credit commitments, spending and the property being bought.
Before viewing homes, first-time buyers should check:
- Deposit available
- Likely borrowing range
- Monthly payment comfort
- Credit file position
- Stamp Duty position
- Legal and moving costs
You can read more on our First Time Buyer page.
Affordability When Moving House
If you are moving home, affordability may be reassessed.
Even if you have paid your current mortgage on time, the lender will look at the new mortgage, new property and current circumstances.
This matters if:
- You want to borrow more
- Your income has changed
- You have new credit commitments
- You have childcare costs
- You are porting an existing mortgage
- You are buying before selling
- You are moving to a higher-value property
Read our Moving House guide before committing to a purchase.
Affordability for Remortgages
A remortgage may involve affordability checks too.
This is especially true if you want to switch lender, borrow more, change the term or consolidate debt. Your current lender may have different options from a new lender.
Visit our Remortgage page if your current mortgage deal is ending.
Stamp Duty and Wider Costs
Affordability is not only the mortgage payment.
Property buyers may also need to budget for Stamp Duty Land Tax, legal fees, valuation fees, survey costs, product fees, moving costs and insurance.
GOV.UK explains that SDLT is usually paid on increasing portions of the property price when buying residential property. First-time buyer relief and higher rates for additional properties may also apply.
Use our Stamp Duty Calculator to estimate potential tax costs.
How to Prepare Before Applying
Before applying for a mortgage, it helps to:
- Check your credit file
- Review income evidence
- Check bank statements
- List credit commitments
- Estimate monthly payments
- Check deposit evidence
- Allow for moving costs
- Consider the mortgage term
- Avoid unnecessary new credit
- Speak to an adviser before making an offer
Affordability is not only a lender calculation. It is a real household decision.
Speak to a Mortgage Adviser
Mortgage affordability should be reviewed before a full application is submitted.
An adviser can help assess your income, spending, deposit and documents. They can also explain which lenders may be more suitable for your situation.
Speak to our mortgage advisers
FAQs
What do lenders check for mortgage affordability?
Lenders may check income, spending, debts, dependants, credit history, mortgage term, deposit and property details.
Is affordability based only on salary?
No. Salary is important, but lenders also review commitments, spending, credit history and lender criteria.
Can I borrow more if I have a bigger deposit?
A bigger deposit can help, but affordability still depends on income, spending and lender rules.
Do credit cards affect mortgage affordability?
Yes. Credit card balances and monthly payments may reduce the amount a lender is prepared to lend.
Should I use a mortgage calculator before applying?
Yes. A calculator can help estimate monthly payments, but it is only a guide. A lender’s decision depends on the full application.
