Side Income and Mortgages: How Lenders Treat a Second Job or Side Hustle🏠

Side income and mortgages: how lenders treat a second job or side hustle

Plenty of people now earn something on the side: weekend shifts, freelance work, selling online or renting out a parking space. When it comes to buying a home, the obvious question is whether that money counts. Sometimes it does, sometimes it doesn't, and the paperwork usually decides which.

Quick answer: does side hustle income count for a mortgage?

It can. Lenders will usually consider side income if it is regular, properly documented and has a track record, often one to two years on a tax return for self-employed earnings. A second PAYE job is generally easier to evidence than self-employed side income. Undeclared income can be difficult to use.

Is it a second job or self-employment?

This is the first thing a lender will want to know, because they treat the two differently.

A second job where you are on the payroll, with payslips and tax deducted, is the simpler case. A lot of lenders will consider it if you have held it for a set period, often six to twelve months, and it looks likely to continue. Some will count all of it, some only part, and some will ignore it unless it is in the same line of work as your main job.

Side income where you invoice customers, sell goods or provide a service for yourself is generally self-employment. That means lenders may want to see it declared through Self Assessment, usually for at least one and often two full tax years.

Does income under the trading allowance count?

Usually not without sufficient supporting evidence. For the 2026/27 tax year, you can earn up to £1,000 a year in qualifying gross trading income under the trading allowance without normally needing to declare it to HMRC.

From 6 April 2027, the government plans to increase the trading allowance from £1,000 to £3,000, alongside the Self Assessment reporting threshold for trading income, subject to legislation.

That is handy for tax, but it can mean there is no official tax return recording the money, and a lender needs evidence. Some lenders may consider alternative documentation, although small amounts of side income are unlikely to make a substantial difference to how much you can borrow.

If your income exceeds the applicable threshold, you may need to register and file a return. GOV.UK's Self Assessment checker tells you whether you need to. Filing properly can also help provide evidence of your side income for mortgage purposes.

For more information, see our UK side hustle tax guide.

How do lenders work out self-employed side income?

They usually look at your profit, not your turnover. That is the figure after expenses, as shown on your SA302 tax calculation and tax year overview. If you have two years of figures, a lot of lenders will take the average. Some will use the latest year if it is higher, and a few will consider one year on its own.

This is where side hustlers get caught out. If you claim every allowable expense to keep your tax down, your declared profit may be smaller, and that can affect how much income a lender will consider. It is worth thinking about this a year or two before you plan to buy.

What if your side income is growing quickly?

Good news for your bank balance, slightly awkward for a mortgage. A lender averaging two years will pull your strong second year down towards your weaker first one. Lenders that use the latest year, or that accept one year's accounts, can make a real difference here. A specialist broker will know which those are.

How much could you borrow?

It depends on your total income, your outgoings, your credit history and the lender. A calculator built for self-employed income gives you a better starting point than a generic one, because it lets you enter profit figures from your tax returns rather than a salary. Jones & Young has one at https://jonesandyoung.co.uk/self-employed-mortgage-calculator/, built for people whose income comes from self-employment.

What should you do now?

Declare your side income properly where required and keep good records. Download your SA302s and tax year overviews from your HMRC online account. Keep clear records of business income and expenses so they are easy to evidence. And if you are planning to buy in the next couple of years, speak to a broker who understands self-employed income and can explain how lenders will assess your circumstances.

Your home may be repossessed if you do not keep up repayments on your mortgage.

Jones & Young is an independent mortgage broker based in Petersfield, Hampshire, specialising in self-employed clients, company directors and CIS workers. Jones and Young Limited is authorised and regulated by the Financial Conduct Authority, Financial Services Register number 950544.