Mortgage affordability is about whether you can keep up with mortgage payments alongside your other spending. A lender may offer more than you feel comfortable borrowing, so its limit should not become your target. Start with what you could borrow and comfortably pay each month. Then check the cash you need for your deposit and buying costs.
Four steps to check your affordability
BORROWING
Estimate your borrowing
Use our mortgage affordability calculator for an income-based estimate, not a lender decision.
BUDGET
Check your monthly budget
Look at repayments alongside bills and other spending to see what fits each month.
BUYING COSTS
Plan your buying costs
Set aside money for the deposit, buying costs and a reserve before you commit your savings.
CIRCUMSTANCES
Find guidance for your situation
Explore joint applications, variable income, debt and changes to your household.
How much mortgage can I afford?
The amount you could borrow depends on the income your lender can count and what you spend. It also checks whether you could keep up repayments over the mortgage term. A salary-based estimate is a starting point, not a confirmed borrowing limit.
Illustrative example: on £50,000 annual income before tax, a 4.5-times estimate gives £225,000. Our calculator uses this approach for many standard estimates. However, it is not a mortgage offer or a universal lending limit.
Lenders can reach different figures from the same income. Read about mortgage lending multiples to see how these estimates work.
Once you have an estimate, compare the payments with your budget rather than treating it as a spending target. The price range for your search also depends on the deposit left after buying costs.
How is mortgage affordability calculated?
When determining mortgage affordability, lenders check which income they can count and how you can prove it. Next, they look at your bills, regular payments and dependants. No single percentage of income gives every household a safe mortgage budget.
Loans, credit cards, car finance and childcare can leave less room for mortgage payments. Lenders may also use stress tests to check whether you could still pay if interest rates rise. Our mortgage affordability checks guide explains the evidence and process.
Although a borrowing estimate may use income before tax, use take-home pay for your own monthly budget. Review your bank statements to see what comes in, what goes out and what remains for daily life.
Plan your monthly repayments and costs
Compare monthly mortgage repayments with bills, insurance and repairs, while leaving some money for unexpected costs. The loan amount, interest rate and mortgage term all affect the payment.
Illustrative example: the same £200,000 repayment loan over a 30-year term.
Illustrative interest rate
Approximate monthly payment
5%
£1,074
7%
£1,331
Both examples exclude fees and assume the rate stays the same. They are not current offers or forecasts. For an existing mortgage, the balance still owed and time left affect any new payment.
Use the repayment calculator to compare monthly repayments, then compare mortgage rates and fees. Spreading the same loan over a longer term can reduce each payment. However, at the same interest rate, you will usually pay more interest overall. The full mortgage term is separate from the fixed-rate period of your mortgage deal.
With spare money after bills and a reserve, you can see the effect of regular overpayments. First, check how much the lender allows and whether charges apply.
Work out your complete buying budget
Before setting your deposit, allow for legal fees, any property tax, moving costs and a reserve. The wider costs of buying a home need their own budget. If you are moving home, also allow for selling fees and any charges for changing your existing mortgage.
Illustrative example: a £225,000 mortgage and a £25,000 deposit give a £250,000 purchase budget. This assumes the lender approves the mortgage and you set aside separate funds for buying costs.
Loan-to-value (LTV) is the mortgage as a percentage of the property’s value. Work out your loan-to-value to see how your deposit and loan fit together. However, LTV alone does not show whether you can afford the payments.
Tax depends on where you buy. England and Northern Ireland use Stamp Duty Land Tax. Scotland uses Land and Buildings Transaction Tax, while Wales uses Land Transaction Tax. Estimate the tax on your purchase, check the tool’s limits and confirm the amount with your conveyancer.
COMMON AFFORDABILITY CONCERNS
Find answers for your circumstances
The same income does not produce the same answer for every household. Start with the circumstances that most affect your budget.
Buying alone or with someone else
When buying alone, one income must cover both the mortgage and household bills. Leave room for unexpected costs. With a joint application, lenders assess both incomes and both applicants’ regular payments. Joint mortgage affordability depends on the whole budget, so two incomes do not automatically mean twice the borrowing.
Self-employed earnings or variable income
Lenders can assess salary, overtime, bonuses, commission and self-employed income in different ways. They need proof, but not every lender asks for two years of earnings. Also, business turnover is not personal income. Check what the lender will count rather than basing your budget on your best month or year.
Existing debts or credit history concerns
Loan and credit-card payments leave less money for a mortgage each month. Credit history, by contrast, helps a lender assess how you have handled borrowing. Having debt does not automatically rule out a mortgage. Explore borrowing with existing debt or mortgages with bad credit, depending on your concern.
Childcare, dependants or changes ahead
Childcare and other regular costs reduce what you can put towards housing. Also think about income changes, such as retirement, before choosing a long term. Lenders set their own age and term limits. Check how your plans fit those rules rather than relying on today’s earnings alone.
Ways to strengthen your buying budget
Start with the gap you need to close. If income or spending limits borrowing, review ways to improve mortgage affordability. Reducing regular payments may help, but using savings to repay debt also leaves less for your deposit and reserve.
Where the deposit is the main hurdle, a gifted deposit from family may help. However, a family loan that you must repay is not a gift, so make the arrangement clear.
Depending on where you buy, first-time buyer schemes may offer another route. Check which schemes are open and who can use them. You will still need to meet the lender’s rules.
For example, shared ownership lets you buy a share of a home, reducing the amount needed upfront. However, rent on the rest and service charges sit alongside any mortgage payments. Compare these costs together, not just the deposit.
What if your mortgage is declined?
If you’ve had a mortgage declined on affordability grounds, first ask why. Check which income and regular payments the lender included. Then review the amount you want to borrow with a mortgage broker before applying again.
A smaller loan, different term or larger deposit may be worth discussing, but none guarantees approval. Another lender may assess things differently. However, your application must still meet its rules.
A lender can also decline a mortgage because of your credit history or the property. Understanding the reason helps you avoid applying again without addressing the problem.
Move from estimate to mortgage application
A calculator gives an estimate based on the figures you enter. In contrast, a lender-issued Agreement in Principle (AIP) shows what a lender might lend after an initial assessment. Neither is a final mortgage offer.
To start Muttuo’s AIP process, complete the simple form. An adviser will then contact you to discuss your needs and guide your request. Submitting the form does not give you an instant AIP.
Before applying for a mortgage, gather the documents your adviser asks for. The lender will check these and the property before deciding whether to make an offer.
How Muttuo can help
Muttuo compares options from 100+ lenders across the market. We’ll help you understand what you could borrow and how it fits your budget.
Review your income and regular spending
Compare relevant mortgage options and costs
Prepare for your mortgage application
Plan your next mortgage step
Talk through your income, deposit and budget with a mortgage adviser.
Your lender may repossess your home if you do not keep up with your mortgage repayments.
Your mortgage affordability questions answered
Is an affordability check a credit check?
No. An affordability assessment looks at whether payments fit your income and spending. A credit check helps the lender assess risk by looking at your credit report. Both can form part of an application, but a calculator estimate is not a credit check. A good credit score does not guarantee the borrowing you need.
What if my current mortgage becomes unaffordable?
Contact your lender as soon as you are concerned, ideally before missing a payment. It can discuss support based on your circumstances. Before agreeing to any change, ask how it could affect your monthly payments, total costs and credit file.
