How Much Can I Borrow?

Discover your borrowing power and plan your dream move confidently

When buying a home in the UK, one of the most frequently asked questions is, How much can I borrow for a mortgage? This isn't just a curiosity—it's the foundation for every successful home-buying journey. Whether you're a first-time buyer, remortgaging, or looking to move up the property ladder, understanding your mortgage affordability is crucial.

In this guide, we'll break down how lenders calculate mortgage borrowing, what impacts affordability, the role of income multiples, and practical steps to boost your borrowing potential. It's all about clarity and confidence, so let's dive in.

How Much Can I Borrow for a Mortgage? The Basics

Mortgage lenders determine how much they're willing to lend based on your income and outgoings. Typically, lenders offer 4 to 4.5 times your annual income, although some may stretch to 5 or even 6 times in some instances.

Example:
If your income is £40,000 a year, you can borrow up to £180,000 (using a 4.5x multiplier), depending on your financial commitments and creditworthiness.

But borrowing is more than a simple equation—your affordability matters as much as your income. That means your spending habits, debts, dependents, and even the type of property you're eyeing all factor in.

What Affects Your Mortgage Borrowing Amount?

There are several variables lenders consider when working out your borrowing capacity:

• Income (employed, self-employed, or mixed)

• Debt levels and financial commitments

• Number of dependents

• Monthly expenses and lifestyle costs

• Credit score and history

• Deposit size and Loan-to-Value (LTV) ratio

Even something seemingly simple as child maintenance payments or student loans can affect how much you'll be approved to borrow.

Why Income Multiples Matter (But Aren't Everything)

Historically, mortgage borrowing was based on income multiples alone. Today, affordability assessments play a much more significant role. However, income multiples still serve as a rough guide:

Types of Income That Count Toward Borrowing

Mortgage lenders don't just look at your basic salary. They may also include:

• Bonuses and overtime (if regular)

• Commission

• Pensions and annuities

• Maintenance payments

• Investment or rental income

• Universal Credit (some lenders)

• Freelance or contractor income

Different lenders have different rules, especially for self-employed applicants, so a mortgage broker can be your secret weapon.

How Much Deposit Do You Need?

Typically, you will need a deposit of around 5%, although a larger deposit of 10–15% may give you more choice and better interest rates.

LTV Ratio Example:

• Property price: £250,000

• Deposit: £25,000

• Mortgage: £225,000
  = 90% Loan-to-Value (LTV)

Lenders will assess affordability more favourably with a lower LTV.

Borrowing with a second applicant

If you are applying with a partner or another applicant, lenders usually look at both incomes together. As a simple guide, our calculator uses the same salary multiple for the second applicant as the first. In practice, lenders also look at both applicants' credit history, existing commitments and deposit, so the result is only an estimate.

Examples: how income multiples can work

Lenders commonly use multiples of around 4 to 4.5 times income, although some may offer more or less depending on your circumstances. These examples are illustrations only and are not an offer or a quote.

Using a Mortgage Affordability Calculator

Most brokers, including TF Mortgages, provide handy mortgage calculators that give you a quick idea of how much you could borrow. While these aren't definitive, they help you set realistic expectations.

All you need to enter:

• Your income (and partner's, if joint)

• Monthly commitments

• Desired loan term

• Interest rate (estimate)

Within seconds, you'll get a rough idea of your borrowing power.

What About Credit Score?

A good credit score can mean:

• Access to better interest rates

• Higher borrowing amounts

• Faster mortgage approval

If your credit score needs a boost, consider:

• Paying off debts

• Registering on the electoral roll

• Avoiding multiple credit applications before applying for a mortgage

How to Increase How Much You Can Borrow

Want to borrow more? Here are some tips:

• Clear outstanding debts

• Increase your income (side jobs, overtime)

• Reduce unnecessary expenses

• Apply jointly with a partner

• Extend the mortgage term (e.g., 30 years instead of 25), although this can increase the total interest you pay

• Improve your credit score

These changes can significantly improve your affordability profile.

How a Mortgage Broker Can Help

A mortgage broker can compare options across the lenders they work with and may be able to:

• Find lenders that offer higher income multiples

• Present your case clearly to lenders

• Identify lenders that are self-employed or contractor-friendly

• Help first-time buyers and those with adverse credit

Your next step

Understanding how much you can borrow is the first significant step in homeownership. And it's not as confusing as it seems. With the right tools, a knowledgeable broker, and a clear financial picture, you can discover what's realistic and possible—and maybe even exceed your expectations.

If your credit history is not perfect, see our poor credit mortgages page. Buying your first home? Read our first time buyer guide, and once you know your budget, try the repayment calculator.