First-time buyer joint mortgage

First-time buyer joint mortgages: the essentials

A joint mortgage is simply a mortgage taken out by more than one borrower to buy a property together. For first-time buyers, the core process is much the same as buying with a single applicant: the lender assesses affordability, credit history, income and outgoings, and the property is used as security.

Where things can differ is in the availability of certain first-time buyer incentives (including some stamp duty advantages) and in how ownership is structured on the deeds.

This guide explains the key moving parts so you can understand how joint borrowing works and what to think about before you commit.

Do both applicants need to be first-time buyers?

For many first-time buyer incentives, lenders and HMRC generally treat the purchase as a combined application. In practice, that often means both joint applicants must be first-time buyers to access the most common first-time buyer benefits.

If one person has owned a property before, the couple may be treated as “returning property owners” for the purposes of certain reliefs. That can affect stamp duty outcomes and the range of deals available.

What if only one person is a first-time buyer?

In some cases, lenders may still offer products that consider one applicant’s first-time buyer status. However, the stamp duty position is usually less flexible, and it’s important not to assume relief will apply.

A broker can help map out the options based on your exact circumstances, including whether the way you structure ownership could make a difference.

Stamp duty and joint purchases: why it can be different

Stamp duty relief for first-time buyers is typically linked to whether the buyers are treated as first-time buyers for the transaction.

Where one joint applicant has previously owned a home, first-time buyer stamp duty relief may not apply. Even if the other applicant has never bought before, the purchase may still be treated as a returning-owner transaction.

Because stamp duty rules can be technical, it’s sensible to treat this as a “check early” item rather than something to leave until the last minute.

Joint tenants vs tenants in common (and why it matters)

When you buy with another person, you’ll usually be asked how you want to hold the property on the deeds. The two main options are:

Joint tenants

• You are treated as having equal ownership (commonly described as 100% together).
• If one of you dies, the property typically passes to the surviving joint tenant, regardless of what’s written in a Will.

Joint tenants are often chosen when you and your partner are contributing similarly and you want the property to pass automatically to the survivor.

Tenants in common

• You can own different shares of the property.
• You can decide what happens to your share through your Will.

Tenants in common can be useful where:

• you’re contributing different amounts to the purchase,
• you want to reflect unequal deposits,
• you want flexibility for children or wider family arrangements.

Example: If one person contributes more towards the purchase, you might agree ownership in a 60/40 split and reflect that on the deeds.

Can you have a guarantor on a first-time buyer joint mortgage?

Yes. A guarantor can sometimes be used to support a mortgage application where the borrowers’ income or affordability is not quite sufficient on its own.

In most cases:

• the guarantor is not listed as a borrower on the mortgage,
• but they may be contractually responsible for repayments if the borrowers cannot meet them.

Because guarantor arrangements can have serious legal and financial implications, it’s important that the guarantor understands what they’re agreeing to and takes appropriate advice.

What is a Joint Borrower Sole Proprietor (JBSP) mortgage?

A JBSP mortgage is a structure where:

• only one applicant is named as the property owner (the “proprietor” on the deeds),
• but both applicants are on the mortgage and their incomes can be assessed for affordability.

This can be relevant where one person is a first-time buyer and the other is not, and you want to explore whether the structure could support access to certain first-time buyer incentives.

Is a JBSP mortgage right for everyone?

It depends. JBSP can be a practical solution for some couples, but it also means the ownership position is not symmetrical in the way many people expect. Some couples may later consider changing the ownership structure when they remortgage, but that’s not always straightforward and will depend on lender and legal requirements.

How much can you borrow with a joint mortgage?

Lenders typically look at affordability using your combined income, but the final borrowing amount depends on factors such as:

• your income type (PAYE, self-employed, bonuses),
• monthly commitments,
• deposit size,
• credit history,
• and the property’s value.

As a general rule of thumb, many borrowers see mortgage offers around 4.5 to 5 times combined income, though some products can allow higher multiples. The key point is that “how much you can borrow” is not just about income—it’s also about what you can realistically afford to repay.

How is a joint mortgage calculated?

When lenders assess a joint mortgage, they consider more than just your income. Typical inputs include:

• deposit and loan-to-value (LTV),
• your monthly expenditure and existing financial commitments,
• credit history and repayment behaviour,
• and the affordability of the mortgage payment under the lender’s stress-testing.

Credit scoring is not just about the number. Lenders often focus on patterns—such as missed payments or defaults—rather than minor or isolated issues.

Deposit requirements for first-time buyer joint mortgages

Many first-time buyer joint mortgages are available with deposits around 5%, although the best options can vary depending on the lender, the property, and your overall affordability.

As a general principle:

• a larger deposit can improve your loan-to-value position,
• and that can affect the range of products available and the pricing.

Can you transfer a joint mortgage to one person?

It’s possible in some circumstances, but it’s not usually a quick or automatic process.

When you take out a mortgage jointly, both borrowers are responsible for the debt. To remove one person from the mortgage, the lender typically needs to be satisfied that the remaining borrower can afford the repayments on their own.

If the lender agrees, the property ownership may also need to be updated to reflect the new arrangement.

What if the remaining borrower can’t afford it?

If the remaining person cannot meet the affordability requirements, the options may be limited. In some cases, that can mean selling the property and starting again with a new mortgage.

Joint mortgages and credit history: what to consider

Applying with another person links your mortgage application together. That means:

• a strong credit profile from one applicant may not fully offset issues from the other,
• lenders will assess both applicants’ credit behaviour and affordability.

If one person has past credit problems, it can still be possible to find suitable options, but the range of lenders and pricing may be affected.

How a mortgage broker can help with a joint first-time buyer application

A joint mortgage application can involve more variables than a single-borrower case—especially when incentives, ownership structure, or guarantor arrangements come into play.

A broker’s role is to:

• identify which mortgage structures best match your situation (including options like JBSP where relevant),
• consider how stamp duty and first-time buyer incentives may be impacted by each applicant’s history,
• compare suitable lender options based on affordability and product availability,
• and help manage the application process so you’re not left guessing at the details.

Key takeaways

• For many first-time buyer incentives, both joint applicants generally need to be first-time buyers.
• If one applicant has owned property before, stamp duty relief may not apply, even if the other applicant is a first-time buyer.
• You can choose how you hold the property: joint tenants (equal share and automatic transfer on death) or tenants in common (flexible shares and Will planning).
• A guarantor may be possible, but they can become contractually liable for repayments.
• A JBSP mortgage can be an option where one person is a first-time buyer and the other is not, by separating ownership and mortgage affordability assessment.
• Borrowing is based on affordability, not just income—deposit size, commitments and credit behaviour all matter.
• Transferring a joint mortgage to one person depends on the lender’s affordability assessment.

Important considerations

A mortgage is a long-term financial commitment. If you do not keep up with repayments, the property may be at risk of repossession.