What Do Mortgage Lenders Check for Affordability? A mortgage lender is not only deciding how much it could lend.
It must also consider whether the proposed repayments appear manageable throughout the mortgage term.
This makes mortgage affordability more detailed than a simple income multiple. Two people may earn the same salary but receive different borrowing results.
Their household costs, debts, deposit, income structure and future circumstances may be very different.
At a Glance
When assessing mortgage affordability, a lender may examine:
- Your employed, self-employed or retirement income.
- Regular household spending.
- Loans, credit cards and other commitments.
- Your deposit and loan-to-value ratio.
- The proposed mortgage term.
- Your credit history.
- Dependants and childcare costs.
- Possible changes to income or repayments.
Each lender uses its own calculation. Therefore, one lender’s estimate may differ from another’s.
What Is a Mortgage Affordability Check?
A mortgage affordability check helps a lender decide whether you could reasonably maintain the proposed repayments.
The lender usually compares acceptable income against financial commitments and normal household expenditure.
It may also consider whether the mortgage would remain manageable if costs increased or income changed.
The assessment is designed to look beyond today’s payment. A mortgage could continue for many years, so the longer-term position also matters.
Our main guide explains how mortgage affordability works from application to mortgage offer.
What Income Will a Mortgage Lender Consider?
A lender may consider several forms of income.
These can include:
- Basic salary.
- Regular overtime.
- Bonuses.
- Commission.
- Pension income.
- Self-employed profit.
- Company director income.
- Contract income.
- Certain benefits.
- Maintenance payments.
- Rental income, where accepted.
Not every lender treats each income source in the same way.
Some lenders may accept all regular overtime. Others may use an average or only accept part of it.
Variable income usually needs a reliable history. The lender may review payslips, P60s, bank statements or employer confirmation.
For joint applications, acceptable income from both applicants may be considered.
How Is Self-Employed Income Assessed?
Self-employed applicants can apply for residential mortgages. However, their income is usually evidenced differently.
A sole trader may be assessed using taxable profit.
A limited company director may be assessed using salary and dividends. Some lenders may also consider retained company profit.
Contractors may be assessed through completed accounts, daily rates, current contracts or previous contracting history.
Documents may include:
- Finalised business accounts.
- SA302 tax calculations.
- Tax Year Overviews.
- Personal bank statements.
- Business bank statements.
- Dividend vouchers.
- Current contracts.
- Accountant details.
The lender will usually want to understand whether the income is sustainable.
A profitable business does not automatically produce the same affordability result with every lender. Their calculation methods can differ.
The Connect Mortgages self-employed mortgage guide provides further information about income evidence and lender checks.
What Household Spending Is Included?
Mortgage affordability includes more than debts.
A lender may consider normal household expenditure, including:
- Council tax.
- Energy bills.
- Water charges.
- Food and household shopping.
- Travel expenses.
- Childcare.
- School fees.
- Insurance.
- Maintenance payments.
- Ground rent.
- Service charges.
- Personal expenses.
Applicants may provide some of these figures directly.
A lender may estimate other expenses using household information and statistical data.
Providing accurate figures is important. Reducing or excluding genuine spending does not create a reliable application.
What Financial Commitments Do Lenders Check?
Existing borrowing can reduce the income available for mortgage payments.
A lender may review:
- Personal loans.
- Car finance.
- Credit card balances.
- Hire purchase agreements.
- Overdrafts.
- Student loan deductions.
- Child maintenance.
- Buy now, pay later arrangements.
- Other mortgages.
- Secured loans.
The lender may use the required monthly payment rather than only looking at the outstanding balance.
A smaller debt with a high monthly payment could affect affordability more than a larger debt repaid over a longer period.
Does a Deposit Affect Affordability?
Your deposit affects the amount you need to borrow and the loan-to-value ratio.
Loan-to-value compares the mortgage with the property’s value.
For example, a £180,000 mortgage on a £200,000 property would represent 90% loan-to-value.
A larger deposit may:
- Reduce the mortgage required.
- Lower the monthly payment.
- Provide access to a wider product range.
- Reduce the interest rate available in some circumstances.
However, a deposit does not replace the affordability assessment.
A lender should not approve unaffordable borrowing simply because substantial equity exists in the property.
How Does the Mortgage Term Affect the Calculation?
A longer mortgage term usually spreads the borrowing across more monthly payments.
This may reduce the scheduled monthly repayment. However, it can increase the total interest paid.
A shorter term may reduce the overall interest cost but produce higher monthly payments.
The lender may also consider:
- Your age at application.
- Your age when the mortgage ends.
- Your expected retirement date.
- How income may change during the term.
- Whether the proposed term meets its criteria.
The lowest monthly figure is not always the most suitable outcome.
Affordability must be considered alongside the full cost and the time needed to repay the loan.
Why Does Credit History Matter?
Credit history and affordability are separate checks, but they can affect each other.
Affordability asks whether the payments appear manageable.
Credit history shows how previous and current financial commitments have been handled.
A lender may review:
- Missed payments.
- Defaults.
- County Court judgments.
- Current credit balances.
- Credit utilisation.
- Recent applications.
- Overdraft use.
- Electoral roll information.
Past credit problems do not always prevent a mortgage. However, they may affect lender choice, deposit requirements and available rates.
You can review the practical preparation steps in our mortgage credit file guide.
Do Lenders Consider Future Changes?
A lender may consider changes that are known or reasonably expected.
Examples could include:
- Retirement during the mortgage term.
- A fixed-term employment contract ending.
- Planned reductions in working hours.
- Expected changes to childcare costs.
- A known increase in financial commitments.
- A mortgage rate changing after an initial period.
The Financial Conduct Authority’s responsible mortgage lending rules explain the regulatory principles behind affordability assessments.
Does an Affordability Check Guarantee Approval?
No.
An affordability result is only one part of a mortgage application.
The lender may also assess:
- Credit history.
- Identity.
- Source of deposit.
- Property condition.
- Property type.
- Valuation.
- Loan purpose.
- Eligibility under its lending policy.
An affordability calculator provides an estimate.
An agreement in principle provides an initial lender indication.
A mortgage offer is issued after the lender completes its required underwriting and property checks.
Even an offer may contain conditions that must be satisfied before completion.
How Can You Prepare?
Before applying, you can:
- Review your income documents.
- List all regular commitments.
- Check your credit reports.
- Avoid unnecessary new borrowing.
- Prepare proof of deposit.
- Check bank statements for errors.
- Consider likely future income changes.
- Calculate a comfortable monthly budget.
Preparation does not mean making the figures look better.
It means giving the lender clear and accurate evidence.
Speak to Connect Lifetime
Affordability calculations differ between lenders.
Connect Lifetime can review your income, commitments, deposit and mortgage plans before an application is submitted.
An adviser can also explain what evidence may be required and which lenders may suit your circumstances.
Important information
A mortgage affordability calculation is an estimate. It does not constitute a mortgage offer or guarantee that an application will be accepted.
Your home may be repossessed if you do not keep up repayments on your mortgage.
