When one of you is self-employed: how joint mortgage affordability actually works

7 min read · June 2026

If one of you is employed and the other is self-employed, welcome to one of the more frustrating corners of the mortgage market. The maths isn't complicated. The paperwork is. And the number of things a broker might forget to tell you is higher than it should be.

The good news: lenders do this every day. It's not unusual, and it's not a dealbreaker. But it requires more preparation, more documentation, and more lead time than a straightforward two-PAYE application.

How lenders assess self-employed income

The core principle is that lenders want to see a stable, verifiable track record of income. They can't just take your word for it, and they can't use invoices or bank transfers as standalone evidence. What they use instead depends on your trading structure.

Sole trader or partnership

If you're a sole trader, lenders will look at your net profit — the figure on your Self Assessment tax return after business expenses. Most lenders want two years of accounts. Some accept one year for applicants with a long employment history in the same field before going self-employed. A few require three.

They typically take an average of the last two years, or use the most recent year if income is rising. If income has dropped significantly in the most recent year, expect them to use the lower figure — or to ask questions about it.

Limited company director

This is where things get more nuanced. If you run a limited company and pay yourself a combination of salary and dividends — which most directors do, for tax efficiency — lenders will look at salary plus dividends drawn, not the company's total profit.

This trips up a lot of directors. If you've been leaving significant profit in the company (either to reinvest, or because your accountant recommended it for tax reasons), that retained profit does not count as your income for mortgage purposes. The lender can only see what you've actually drawn out.

Some specialist lenders will consider net profit plus salary, which is more generous — but they're not all the same. A broker who understands self-employed applications will know which lenders are worth approaching.

What documents you'll actually need

Gather these before you start the process, not during it:

• SA302 forms: Two or three years of tax calculations, downloadable directly from HMRC via your Government Gateway account. This is the document lenders most commonly ask for.
• Tax year overviews: Confirmation from HMRC that your Self Assessment has been filed and any tax owed has been paid. Download from the same place as your SA302.
• Business bank statements: Usually the last three months, sometimes six or twelve.
• Company accounts (limited company directors): Two or three years of accounts, signed by a qualified accountant. HMRC-filed accounts only — draft accounts won't be accepted.
• Accountant's certificate: Some lenders require a letter from a chartered accountant confirming your income. Not all do, but having an accountant who can provide this quickly helps.

The employed partner's side

For the PAYE half of a joint application, the process is more straightforward:

• Three to six months of payslips
• Most recent P60
• Employment contract (sometimes, particularly for newer jobs)
• Bank statements showing salary landing

If the employed partner is still in a probationary period, some lenders won't consider them at all. Others will, but with a higher rate or more restrictive terms. Worth knowing in advance.

Practical tips for a smoother application

• Don't change your trading structure in the year before applying. Going from sole trader to limited company, or significantly restructuring how you pay yourself, creates a gap in your evidence trail that lenders find difficult to assess.
• Don't take a large pay cut in the final year. If you deliberately reduced your drawings for a year to minimise tax, that year will now be part of your income calculation. Some forward planning with your accountant is worth it if you're thinking about buying in the next two years.
• More years of trading = more lender options. With one year of accounts, you're limited to a narrower range of lenders. With three years, you have access to most of the market.
• Use a broker who specialises in self-employed cases. The self-employed mortgage market has quirks that a generalist broker may not know. A specialist will know which lenders are genuinely flexible vs. which ones claim to be.
• Get your SA302s early. They can take a few days to arrive if you request them by post. Download them directly from your HMRC account via Government Gateway — it's instant.