I’m a first-time buyer: mortgage basics and what to prepare

Buying your first home is a major step. It can feel exciting, but also a little overwhelming—especially when you’re not sure how mortgages actually work or what lenders will look at.

This guide brings together the key building blocks first-time buyers need to understand before you start making decisions about property, deposit and borrowing.

How mortgages work

A mortgage is a loan you take out to buy a property. The lender provides the money, and the property is used as security for the loan.

Mortgage term and repayment structure

Most mortgages are offered over a term that can run for many years (often up to around 40 years for standard repayment mortgages). The term affects your monthly payments and the total interest you pay.

With a repayment mortgage, your monthly payment covers both:

• interest on the amount borrowed, and
• part of the loan (capital)

With an interest-only mortgage, your monthly payment covers only the interest, with the capital repaid later (typically using a separate plan). Some mortgages are structured as a mix of repayment and interest-only.

Capital and interest

• The amount you borrow is the capital sum.
• The lender charges interest on that amount.
• Your monthly payment is calculated based on the interest rate, the term, and the repayment type.

Your deposit

Your deposit is the portion of the property price you pay yourself. It’s often one of the biggest factors influencing how lenders approach your application.

Why a larger deposit can help

In general, a bigger deposit can make your application more attractive because it reduces the lender’s risk. It may also mean you’re more likely to have access to a wider range of mortgage options.

While some lenders may offer mortgages with smaller deposits, first-time buyers often find that increasing their deposit can improve the overall position of their application.

Deposits can come from more than one source

A deposit doesn’t always have to come entirely from your own savings. Many first-time buyers use a combination of:

• savings
• support from family (for example, a gifted deposit)

If you’re considering a gifted deposit, it’s important to understand that lenders may have specific requirements around how the gift is evidenced and documented.

Your credit file

Before you apply for a mortgage, it’s worth understanding that lenders look beyond a single “score”. They typically assess information from your full credit file.

What lenders commonly consider

Your credit file can include details such as:

• your payment history on credit accounts
• how much credit you have available
• how close and how often you reach the limit on credit cards or overdrafts
• whether you’ve missed payments in the past
• the overall pattern of your borrowing and repayments

Credit reference agencies

In the UK, lenders may use data from the main credit reference agencies, commonly including:

• Experian
• Equifax
• TransUnion

(You may also see credit information presented through services that compile data from these agencies.)

Why it matters before you apply

Mortgage applications can be sensitive to changes in your financial situation. Checking your credit file early can help you spot issues such as errors, missed payments, or unexpected entries that you can address before you submit an application.

Affordability: how lenders decide what you can borrow

A common first-time buyer question is: “How much can I borrow?”

In the past, estimates were often based on a simple multiple of income. Today, lenders focus heavily on affordability—whether you can realistically make the repayments based on your circumstances.

What affordability looks at

Lenders typically review:

• your income
• your regular outgoings
• your existing financial commitments
• your credit history
• the proposed mortgage payment and how it fits into your budget

This approach is designed to ensure repayments are sustainable not just now, but in the future.

Why a broker can be useful

Even though lenders work within similar broad principles, they can apply affordability and underwriting in slightly different ways. A mortgage broker can help you understand how your situation may be viewed and how to approach the application with the right lender for your circumstances.

Preparing for your first mortgage application

Before you start looking at properties, it can help to gather and review the essentials that often influence the mortgage process:

• Deposit plan: how much you have, and whether any part is gifted
• Credit file check: accuracy, missed payments, and overall credit usage
• Affordability picture: your income and outgoings, including any regular commitments
• Mortgage preferences: repayment type and the term you’re considering

Taking time to get these areas in order can reduce stress later and help you move forward with more confidence.

Next steps in the first-time buyer journey

Once you understand the fundamentals—mortgage structure, deposit expectations, credit file considerations and affordability—you’ll be in a better position to:

• plan a realistic budget
• choose a mortgage approach that fits your circumstances
• prepare for the information lenders will ask for

If you’re unsure where to start, focusing on these core areas first is often the simplest way to build momentum as you move towards buying your first home.