Quick answer
Most UK lenders average your last 2 years of self-employed income, some use only your latest year, and a smaller group will lend on just 1 year of accounts. Because the method varies so much, the very same set of accounts can support a maximum mortgage that is tens of thousands of pounds apart depending on which lender you approach.
How lenders assess self-employed income
The starting figure depends on how your business is structured. Sole traders are assessed on net profit — the figure shown on your SA302 tax calculation, after allowable business expenses but before personal tax. Partnersare assessed on their share of the partnership's net profit, in the same proportion as their partnership agreement. Limited company directors are usually assessed on salary plus either the dividends they actually drew from the company, or — at lenders that offer it — a share of the company's net profit, which can be considerably higher for directors who retain profits for growth or tax efficiency.
Once a lender has that starting figure, they still have to decide which year, or combination of years, to use. That decision is the single biggest driver of how far your self-employed income stretches, which is exactly what the calculator above compares.
Getting a mortgage with 1 year of accounts
The majority of lenders want to see 2 complete tax years of self-employed trading before they'll consider an application. If you've only just finished your first tax year, that rules out a large part of the market — but not all of it. A smaller group of lenders, including a handful of mainstream names alongside building societies and specialist lenders, will assess applicants with just 1 year of accounts.
Because this pool of lenders is smaller, expect the trade-offs to be a little tighter: a larger minimum deposit is common, and some lenders apply a slightly lower income multiple to reflect the shorter track record. If you were previously employed in the same line of work before going self-employed, several lenders will view that continuity favourably even with only 1 year of trading behind you.
If your first tax year is close to completion, it can be worth waiting a few months so a second year's figures become available — that opens up the full market rather than the smaller 1-year pool, and lets a 2-year average smooth out an unusually strong or weak opening year.
The evidence you'll need
SA302 tax calculations and matching tax year overviews from HMRC are the standard evidence for sole traders and partners, covering the last 1 to 3 years depending on the lender. You can print these from your HMRC online account, or your accountant can provide them.
Finalised company accounts are required for limited company directors, alongside personal SA302s. Some lenders — particularly those that assess income on a share of net profit rather than dividends — need accounts prepared, and sometimes certified, by a qualified chartered accountant (ICAEW, ICAS or ACCA), rather than an unqualified bookkeeper.
An accountant's reference is sometimes requested as an additional check, confirming your trading position and that your accounts fairly represent your income. Getting this paperwork organised before you apply is one of the most effective things a self-employed applicant can do — missing or out-of-date documentation is one of the most common causes of delay.
Frequently asked questions
Can I get a mortgage self-employed with 1 year of accounts?
Yes, though your choice of lender is more limited. Most of the market asks for 2 full years of accounts or SA302s, but a smaller group of lenders — including some mainstream names as well as specialist and building society lenders — will assess you on a single year of trading history. You may be asked for a larger deposit or face a slightly more conservative income multiple.
How many years of accounts do I need for a mortgage?
Two years is the standard requirement and gives you access to the widest range of lenders. Some lenders will work with 1 year, particularly if you were previously employed in the same field. A smaller number of lenders ask for 3 years and average across all three, which can work against you if your most recent year was your strongest.
Do mortgage lenders use gross or net profit?
Almost all UK lenders assess self-employed income on net profit — your income after allowable business expenses — rather than gross turnover. For sole traders this is the figure shown on your SA302 tax calculation. Partners are assessed on their share of the partnership's net profit, and limited company directors are usually assessed on salary plus either dividends drawn or a share of net profit.
What if my latest year of profit is lower than the year before?
This is where lenders diverge most. Some average your last 2 years regardless, which softens the impact of a weaker recent year. Others work off your latest year only — and when profits are falling, these lenders typically take the lower, most recent figure rather than letting a stronger earlier year pull your assessable income up. A minority take the lower of the two years as standard, which is the most conservative approach.
Do I need an accountant for a self-employed mortgage?
Not always for sole traders providing SA302s and tax year overviews from HMRC, which you can print yourself or get from your accountant. Limited company directors typically do need accounts prepared, and in some cases certified, by a qualified chartered accountant (ICAEW, ICAS or ACCA) — particularly for lenders that assess income on a share of net profit rather than dividends drawn.
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Last updated: July 2026
