Can First-Time Buyers Use Side Income for a Mortgage?

For many first-time buyers, relying on a single salary may not feel enough to secure the mortgage needed to purchase a home. This has led to growing interest in whether a first-time buyers side income mortgage is possible. Side income can include freelance work, overtime, bonuses, or earnings from part-time roles, and in some cases, lenders may take these into account when assessing affordability.

However, not all income is treated equally. Mortgage criteria can vary widely between lenders, and how side income is assessed often depends on factors such as consistency, documentation, and how long the income has been earned. Understanding how lenders approach additional income can help first-time buyers prepare stronger applications.

This guide explores how side income may be used in a mortgage application, what lenders typically look for, and the potential limitations involved. It provides general information to help you understand the process, rather than personalised advice.

Can first-time buyers use side income for a mortgage?

Yes, first-time buyers can sometimes use side income for a mortgage, but lenders will usually assess how stable and reliable that income is before including it in affordability calculations.

Lenders typically prefer income that is consistent and predictable. For example, regular overtime or a long-standing second job may be viewed more favourably than irregular freelance earnings. The key consideration is whether the income is likely to continue over the term of the mortgage. Evidence such as payslips, contracts, or tax returns may be required to support this.

Different types of side income are assessed in different ways. Bonuses or commission may only be partially included, while freelance income may be averaged over a period of time. This means the full amount earned may not always be counted, which can affect borrowing potential.

It is also important to note that some lenders may apply stricter criteria for first-time buyers, particularly where multiple income streams are involved. This is because there is no prior mortgage repayment history to assess risk.

What types of side income do mortgage lenders accept?

Lenders may accept several types of side income, including overtime, bonuses, freelance work, and part-time employment, depending on how consistent and well-documented the income is.

Overtime and bonuses are among the most commonly accepted forms of additional income. If these payments are regular and evidenced over time, lenders may include a percentage of them in affordability calculations. However, irregular or one-off payments may be discounted or excluded entirely.

Freelance or self-employed side income is often subject to more detailed scrutiny. Lenders may require at least one to two years of accounts or tax returns to demonstrate a stable income pattern. In some cases, they may average earnings across multiple years to smooth out fluctuations.

Income from part-time jobs or secondary employment can also be considered. However, lenders may assess whether maintaining multiple roles is sustainable long-term, especially if the total working hours are high. This can influence how much of the income is included.

How do lenders assess side income for affordability?

When assessing a first-time buyers side income mortgage, lenders typically evaluate the reliability, history, and sustainability of the additional income.

Affordability checks are designed to ensure borrowers can maintain repayments over time. Lenders will usually review bank statements, payslips, and tax documentation to verify income sources. They may also consider how long the side income has been received, with longer histories generally viewed more favourably.

Stress testing is another important factor. Lenders may assess whether repayments remain affordable if interest rates rise. If side income is deemed less reliable, they may exclude it from these calculations or apply a reduced weighting.

Existing financial commitments are also considered. Even if side income is accepted, factors such as credit card balances, loans, and living costs will influence how much can be borrowed. This means that additional income does not automatically translate into higher borrowing limits.

Do you need proof of side income?

Yes, providing clear evidence of side income is usually essential if it is to be included in a mortgage application.

For employed side income, lenders may request payslips showing consistent earnings over several months. If the income includes bonuses or overtime, a history of payments may be required to demonstrate regularity. Employment contracts can also help confirm ongoing eligibility for such payments.

For freelance or self-employed income, documentation is often more detailed. Tax returns (SA302 forms), accounts, and business bank statements are commonly requested. These documents help lenders assess both income level and stability over time.

Inconsistent or poorly documented income may be excluded entirely. This highlights the importance of maintaining accurate financial records, particularly for those with multiple income streams. Without sufficient evidence, lenders may base affordability solely on primary income.

Practical example: how a lender may assess side income

A practical scenario can help illustrate how a first-time buyers side income mortgage might be assessed in real terms.

Consider a first-time buyer earning £30,000 per year from full-time employment, alongside an additional £6,000 annually from freelance graphic design. The freelance income has been consistent for two years and is supported by tax returns and bank statements.

In this situation, a lender may include all or part of the freelance income when calculating affordability. Some lenders might take an average of the last two years’ freelance earnings, while others may apply a percentage, such as 50–80%, depending on perceived stability.

However, if the freelance income had only been earned for a few months or varied significantly, it might be excluded. This could reduce the maximum loan available, demonstrating how income history plays a crucial role in mortgage assessments.

What are the risks of relying on side income?

Relying on side income for a mortgage can introduce additional risk, particularly if that income is not guaranteed long-term.

Side income may fluctuate or stop altogether, especially if it depends on freelance work or variable hours. If mortgage affordability is heavily reliant on this income, any reduction could make repayments more difficult to manage. Lenders take this into account when deciding how much weight to give additional earnings.

There is also the risk of overestimating affordability. Borrowers may assume all income will be included, only to find that lenders apply reductions or exclude certain earnings. This can affect property budgets and borrowing expectations.

Careful financial planning is important when relying on multiple income streams. Considering how repayments would be managed if side income decreased can provide a more realistic view of affordability and help reduce financial strain.

Are there alternatives if side income is not accepted?

If side income is not accepted, there are other ways first-time buyers may improve mortgage affordability.

Increasing the deposit can reduce the loan-to-value ratio, which may improve borrowing options and access to more competitive interest rates. Even a modest increase in deposit size can have a noticeable impact on affordability assessments.

Applying with a joint borrower, such as a partner, can also increase total household income. Lenders will assess combined earnings, which may improve borrowing potential compared to a single application.

In some cases, reducing financial commitments or improving credit history may also help. Lowering outstanding debts or ensuring timely payments can strengthen an application, even if additional income is not included.

FAQ: First-time buyers and side income mortgages

Can freelance income be used for a mortgage?

Freelance income may be used if it is consistent and supported by evidence such as tax returns and accounts. Lenders often require a track record of at least one to two years.

Do lenders count overtime and bonuses?

Many lenders include overtime and bonuses, but usually only a percentage. They typically require a history of regular payments to confirm reliability.

How long do I need to earn side income before applying?

This varies, but many lenders prefer at least 12–24 months of consistent additional income. Shorter periods may be considered less reliable.

Will all of my side income be included?

Not necessarily. Lenders may apply a reduced percentage or exclude certain income types depending on consistency and risk.

Can side income help me borrow more?

It can increase borrowing potential if accepted, but this depends on lender criteria and overall affordability assessments.

This guide provides general information only. Personalised mortgage advice should always come from a regulated mortgage adviser authorised by the Financial Conduct Authority.