Sole Trader Mortgages, Net Profit, SA302s and Lender Methods

What is a sole trader mortgage?

A sole trader mortgage is a residential or buy to let mortgage for someone who runs an unincorporated business in their own name, assessed on the net profit shown in their Self Assessment tax returns. How much they can borrow depends on which year's profit, or which average of years, the lender chooses to use. There is no separate product. Sole traders borrow on the same fixed, tracker and variable rate mortgages as employees. A mortgage on a home the borrower will live in is normally a regulated mortgage, meeting the legal test that at least 40% of the property is used as a dwelling (legislation.gov.uk: Regulated Activities Order, article 61). The lender assesses it under the Financial Conduct Authority's conduct rules for mortgages, MCOB (FCA Handbook: MCOB 11.6). Most buy to let lending is business lending outside those rules. For a sole trader the evidence and the arithmetic differ: the lender reads HMRC's tax calculation, the SA302, with the tax year overview or the business's accounts, and decides how to treat profit that moves from year to year.

A sole trader is self-employed and runs the business as an individual. The owner keeps the profit after tax, is personally responsible for the business's debts and must register for Self Assessment once trading income is more than £1,000 in a tax year (GOV.UK: become a sole trader). Because the business and its owner are the same person for tax, the business's net profit is the owner's taxable income, and that is the figure a lender reads. Expenses claimed to reduce the tax bill also reduce the income a lender sees, a trade-off to weigh before filing the return a lender will read.

Sole traders are one of several self-employed structures, compared side by side on our self-employed mortgages page. A partner in a partnership or a limited liability partnership is assessed on their share of the firm's profit, which our page on partnership mortgages covers. A company director is assessed on salary and dividends or a share of company profit, which our page on mortgages for limited company directors covers. Contractors paid a day rate can be assessed on the contract (see contractor mortgages and IT contractor mortgages), and subcontractors paid under the Construction Industry Scheme have their own page on CIS mortgages.

Mortgage Lane arranges mortgages for sole traders across trades and professions, including builders, electricians, hairdressers, couriers, consultants, therapists and online sellers. That includes traders with one year's figures or profit that has risen or fallen sharply, those with employment or rental income alongside the business, first-time buyers (our first-time buyer mortgage guide covers the schemes), home movers, remortgages, landlords and applicants with past credit problems. We match the shape of the profit to lenders whose income method suits it before any application is made.

Sole trader mortgage rates

Sole trader mortgage rates are set by each lender in the same way as for employees, by product and loan to value (LTV) band, and at specialist lenders by the criteria the case needs. Mainstream lenders do not generally price a mortgage differently because the borrower is self-employed, so a sole trader with two years' figures and a clean credit file is usually choosing from the same products as an employee with the same deposit. Where a case needs a specialist lender, for example with one year's figures, a sharp fall in profit or past credit problems, the product is priced for that lender's criteria and the rate is often higher. Product fees vary in the same way.

For a sole trader, the lender's income method belongs in the comparison alongside the rate and the fee. A lender that reads the latest year's profit can lend tens of thousands of pounds more than one that averages two years on the same returns, and the lowest rate is little use if the loan it supports is too small for the purchase. The worked example further down this page shows the gap. The length of a fixed rate matters too, because the next remortgage is assessed on whichever tax calculations are current at the time; our fixed term mortgages page explains how fixed rates are priced.

Self-employed in your own name? Get in touch with your last two tax calculations and tax year overviews. We work out what each lender method makes of your profit before choosing where to apply.

Sole trader mortgage criteria

Sole trader mortgage requirements cover the same points on every case, and each lender sets its own limits for them. The evidence and affordability rows rest on HMRC's guidance and the FCA's rules, checked in October 2026. The multiple, deposit and credit rows are Mortgage Lane's experience on the cases we arrange. The other rows describe how lenders differ, and the lender's underwriting decides each case. In our experience the standard income multiple is 5 times assessed income after credit commitments, up to 6 times for professionals and specialist products, and for a sole trader assessed income means net profit before tax. A £300 a month car finance payment, for example, takes £3,600 a year off the income before the multiple, which on the worked example below lowers the latest-year maximum from £260,000 to £242,000.

Loans at 4.5 times income or more also count towards the Bank of England's limit on high loan to income lending, which keeps such loans to no more than 15% of new mortgages across the market. Since July 2025, lenders subject to the limit have been able to apply to go above 15% individually, under interim measures that run to 31 December 2026 at the latest. The Prudential Regulation Authority (PRA) and the FCA consulted in April 2026 on making that change permanent, and as at October 2026 the final rules had not been published (Bank of England: high loan to income lending). Our 95% mortgages and 90% LTV mortgages pages cover the two highest loan to value bands.

Types of sole trader case, and how each is assessed

Every sole trader is assessed on net profit, and the case turns on how long the profit has been earned, how much it moves from year to year and what other income sits beside it.

Two or more years trading

This is the standard case. The lender reads two tax calculations and tax year overviews, applies its income method and its affordability assessment, and the full range of mainstream lenders is open. A sole trader whose profit has risen is better served by a lender that reads the latest year, while one whose profit is steady loses little to an average. A return can be filed as soon as the tax year ends on 5 April, so a trader whose latest year was strong can file early and give the lender a newer figure.

Get in touch with two years' tax calculations and tax year overviews.

Sole trader mortgage with one year's accounts

Some lenders accept a single full year of trading, more readily where the applicant did the same work as an employee before going self-employed, because the income then has a track record behind it. The choice of lenders is narrower, and the lender reads that one year's net profit. Lenders treat this as a question of trading history, and each sets its own minimum. Our page on one year self-employed mortgages covers first-year cases in full, including a first return that covers only part of a year.

Get in touch with your first year's tax calculation and your employment history before you went self-employed.

Newly self-employed, less than a year

With less than a full tax year of trading, only a few lenders will consider the case, usually where the trade continues earlier employment, such as an employed electrician going self-employed in the same work, and where contracts, invoices or interim figures support the income. The FCA's guidance leaves room for this: for a self-employed customer, a lender may consider projections of future income that form part of a credible business plan (MCOB 11.6.9G). A sole trader at this stage usually has more choice once the first return is filed. A new sole trader must tell HMRC by 5 October after the end of the tax year in which the business started (GOV.UK: Self Assessment deadlines).

Get in touch to work out whether to apply now or after the first return.

Rising or falling profit

Rising profit suits a lender that reads the latest year. Falling profit is harder. A lender that reads the latest year or the lower year treats the fall as the new level, and a lender that averages may switch to the latest year because it is the lower, until the next return shows otherwise. A one-off dip can be explained, for example illness, a lost contract or a year of heavy spending on equipment, which on the cash basis comes off that year's profit. The accountant's letter and current-year figures make the case, and some lenders will take them into account. Our page on mortgages with decreasing profits covers the evidence that explains a fall and the different ways lenders read it.

Get in touch with both years' figures and an explanation of the change.

Sole traders with other income

Employment pay, rental profit and pension income sit on the same Self Assessment return as the business, and lenders can add each one to the trading profit where it is evidenced. Pay from a job is also evidenced with payslips. Rental income is read from the property pages as profit after allowable costs; some lenders count only part of it, and some leave it out where the let property is being sold or remortgaged. On the same worked example, £6,000 of rental profit counted in full lifts the latest-year maximum from £260,000 to £290,000 at 5 times, and counted at half it lifts it to £275,000.

Get in touch with the full tax calculation, including the pages beyond the business.

Sole trader buy to let

A buy to let mortgage is assessed mainly on the rent. Banks and building societies test the rent against the mortgage interest at a stressed rate (an interest cover ratio) under the PRA's buy to let underwriting standards (SS13/16). Those standards expect lenders to take account of the landlord's personal tax, so a higher-rate taxpayer can need more rent for the same loan. Some lenders also set a minimum personal income, which a sole trader's net profit can meet; in our experience most lenders no longer have a £25,000 minimum. On the cases we arrange, buy to let lending reaches 85% loan to value. A buy to let mortgage on a property let to tenants is generally outside the FCA's mortgage rules. Our guide to buy to let mortgages for self-employed borrowers and the buy to let mortgage guide cover the landlord side.

Get in touch with the property, the expected rent and your tax calculations.

Sole traders with past credit problems

Defaults, county court judgments and missed payments are assessed lender by lender on their age, size and whether they have been settled, and specialist lenders cover a wider range of adverse credit. In our experience adverse credit lending usually stops at around 90% loan to value, so a 10% deposit is a more realistic starting point than 5%. Tax owed to HMRC is disclosed. A bill being paid under a payment plan agreed with HMRC (GOV.UK: if you cannot pay your tax bill on time) counts among the commitments the lender reads, and whether a lender accepts one, and on what terms, varies by lender. Our pages on CCJ mortgages, mortgages with defaults and mortgages with missed payments cover each type of entry.

Get in touch with a copy of your credit file and any HMRC payment plan.

Sole traders in Scotland, Wales and Northern Ireland

Self Assessment and Making Tax Digital apply across the UK, and a lender works out net profit the same way wherever the business trades. A sole trader who lives in Scotland pays Scottish Income Tax on wages, pensions and most other taxable income (GOV.UK: Scottish Income Tax). The tax on the calculation can therefore differ from the tax on the same profit in England, but the profit a lender reads is the same. Buying differs too. Scotland has its own conveyancing, survey (the Home Report) and Land and Buildings Transaction Tax, covered on our mortgages in Scotland page. Wales has had Land Transaction Tax in place of Stamp Duty Land Tax since 1 April 2018, and buying in Northern Ireland is covered on our mortgages in Northern Ireland page.

Get in touch with your tax calculations and where you are buying.

How lenders calculate sole trader income

A lender takes one figure from a sole trader's tax calculation, the net profit from self-employment, and then decides which year, or which average of years, to use.

Net profit, the figure lenders read

Turnover less allowable business expenses gives net profit, which is the figure on the self-employment pages of the return and the income HMRC taxes (GOV.UK: expenses if you are self-employed). Since the 2024 to 2025 tax year the cash basis has been the standard way for sole traders to record income and expenses (GOV.UK: cash basis). On the cash basis, most equipment bought for the business is claimed as an expense in the year it is paid for, and capital allowances are claimed only on business cars. A trader using traditional accounting claims capital allowances on equipment and vans instead (GOV.UK: capital allowances). Either way the deduction lowers net profit. Lenders generally take net profit as it stands, and whether any lender adds items back is set by its own criteria. A trader with a small side business can use the £1,000 tax-free trading allowance in place of claiming expenses.

Which year, or which average

Lenders use a handful of methods, and some apply different ones to different cases. The table sets them out, and the worked example below applies three of them to the same two years.

Tax bills and payments on account

Tax on a sole trader's profit is not usually deducted at source, the main exception being Construction Industry Scheme deductions. It is paid through Self Assessment by 31 January after the tax year ends. HMRC also asks for payments on account unless the previous year's bill was under £1,000 or more than 80% of the tax was already collected at source. These are two advance payments towards the next bill, each usually half of the previous year's tax, due by 31 January and 31 July (GOV.UK: payments on account). The FCA's rules require a lender to take full account of the customer's income net of Income Tax and National Insurance (MCOB 11.6.5R). The lender therefore allows for the tax on the profit it reads, and any tax still owed is part of the commitments it looks at. Some sole traders keep the tax money in a separate savings account, or in the linked savings of an offset mortgage, where it stays visible on the statements a lender reviews.

Expenses and the borrowing trade-off

Every £1,000 of expenses claimed reduces net profit by £1,000, and at 5 times income it reduces the maximum loan on a latest-year reading by £5,000; on a two-year average the effect is half that. Claiming fewer legitimate expenses than are due would mean paying tax that is not owed, and the return must be accurate either way. The planning point to raise with an accountant is timing: a sole trader planning to buy in the next year or two can ask whether discretionary spending, such as new equipment or a van, falls in the year the lender will read. Mortgage Lane does not give tax advice, and an accountant or tax adviser can advise on the return itself.

Documents for a sole trader mortgage: SA302s and tax year overviews

Most of a sole trader's income evidence comes from HMRC's own records, which the applicant can usually print from their online account.

The SA302 tax calculation

The SA302 is HMRC's tax calculation for a Self Assessment year. It shows the total income on which tax is due, by source, the allowances and reliefs given and how HMRC worked out the tax owed for the year. It does not show payments on account already made or other amounts outstanding (GOV.UK: tax calculation (SA302)). A sole trader who files online can print the calculation for each of the last four years from their HMRC online account, under Self Assessment, but not until 72 hours after the return was sent (GOV.UK: get your SA302 tax calculation). Where the return was filed through commercial software, which includes every Making Tax Digital return, the calculation is printed from that software. HMRC's guidance tells applicants to check that the lender accepts documents they have printed themselves.

The tax year overview

The tax year overview is HMRC's summary of the same year from its account records, setting out the tax for the year and the payments HMRC has allocated to it. It can be printed from the HMRC online account for any year, including by a sole trader whose return went through software. Lenders that assess on tax calculations usually ask for the overview alongside each calculation they read, because together they show that HMRC has processed the return and whether the year's tax has been paid. A mismatch between the two, for example after an amended return, is worth resolving before an application.

Accounts and accountant's certificates

Some lenders accept accounts prepared by an accountant in place of, or alongside, the tax calculations, and some ask for an accountant's certificate or reference confirming the profit, particularly where the latest return is recent or the business is complex. Some accept accounts or certificates only from accountants with particular qualifications, such as chartered or certified accountants. A sole trader who prepares their own return can still evidence income with HMRC's documents at lenders that read tax calculations. Since basis period reform, accounts and tax calculations can show different profits for the same trader, as the next section explains.

Bank statements and current-year figures

Lenders usually ask for recent business and personal bank statements, to see the business income arriving and to check outgoings and credit commitments, and the number of months varies by lender. A sole trader who runs the business through a personal account provides that account's statements. Where the latest return is some months old or profit has moved since, management accounts, a year-to-date profit and loss statement or Making Tax Digital quarterly figures can show current trading. Whether a lender reads them, and how much weight it gives them, is set by its criteria.

Making Tax Digital and basis period reform: what changes on a sole trader's tax calculation

Two changes to how sole traders are taxed affect the figures a lender reads.

Making Tax Digital for Income Tax

Making Tax Digital for Income Tax has applied since 6 April 2026 to sole traders and landlords whose qualifying income on their 2024 to 2025 return was over £50,000. The threshold falls to £30,000 from 6 April 2027, judged on the 2025 to 2026 return, and to £20,000 from 6 April 2028, judged on the 2026 to 2027 return (GOV.UK: check if you are eligible for Making Tax Digital for Income Tax). Qualifying income is turnover, meaning total income from self-employment and property before expenses. A partner's share of partnership profit, employment pay, pensions and dividends do not count, and nor do transition profits from basis period reform (GOV.UK: work out your qualifying income). A sole trader whose 2024 to 2025 return showed £60,000 of sales and £35,000 of profit has therefore been in the scheme since April 2026, unless exempt, even though the profit a lender reads is well under £50,000.

Those in the scheme keep digital records in software that works with Making Tax Digital and send HMRC quarterly updates. Each update is cumulative and covers the tax year so far: 6 April to 5 July (due by 7 August), then to 5 October (due by 7 November), to 5 January (due by 7 February) and the full year to 5 April (due by 7 May). HMRC describes the updates as summaries, with a total for each income and expense category (GOV.UK: send quarterly updates). The year's tax return is then submitted through the same software by 31 January after the tax year ends (GOV.UK: submit your tax return), so the first return made this way, for 2026 to 2027, is due by 31 January 2028.

For a mortgage, Making Tax Digital leaves the assessment resting on the annual tax calculation. A sole trader in the scheme holds year-to-date income and expense totals, sent to HMRC every quarter, which can show current trading when the last full return is old or profit has moved. Whether a lender will read them, and in what form, varies by lender. Because the return goes through software, the tax calculation comes from that software and the tax year overview from the HMRC online account.

Basis period reform

Basis period reform changed the profit a sole trader is taxed on. From the 2024 to 2025 tax year, sole traders and partners are taxed on the profits of the tax year itself, 6 April to 5 April. A business whose accounts end on 31 March or 1 to 4 April needs no adjustment, and any other year end means the tax year's profit is apportioned from two sets of accounts (HMRC helpsheet HS222). The 2023 to 2024 tax year was the transition year (GOV.UK: basis period reform). A business with a year end outside 31 March to 5 April was taxed on its usual 12 months plus a transition period running to 5 April 2024, less any overlap relief, and that extra profit is its transition profit.

Transition profit is spread over five tax years by default, starting in 2023 to 2024 and ending in 2027 to 2028. At least 20% was taxed in 2023 to 2024 and the rest is split equally across the remaining four years, unless the trader chose to have more taxed sooner. If the business ceases on or before 5 April 2027, whatever has not yet been taxed is taxed in the year it stops, and overlap relief cannot be used after 2023 to 2024 (GOV.UK: work out your transition profit).

The tax calculations for those five years can include a slice of transition profit on top of the year's trading profit, which makes taxable profit look higher than the business earned in the year. The slice stops after 2027 to 2028, so a lender may ask for the split, and the accountant can show it. For a business with a year end other than 31 March to 5 April, the tax calculation from 2024 to 2025 onwards also shows a tax-year profit that will not match either set of accounts. A lender reading accounts and a lender reading tax calculations can therefore see different figures for the same trader.

How a sole trader mortgage is arranged

1. Income review. Two years' tax calculations and tax year overviews read, any transition profit or one-off items identified, and the profit worked out on each lender method, so the lender is chosen on the figure it will read.
2. Agreement in principle. An agreement in principle from a lender whose income method, trading history rules and loan to value limit fit the case.
3. Application and documents. Tax calculations and overviews, bank statements and any accounts or accountant's certificate submitted, and the lender's valuation of the property.
4. Underwriting questions. Explanations for a change in profit, for other income and for the tax position, with current-year figures where they help.
5. Offer and completion. The mortgage offer, then completion through the conveyancer, with the length of any fixed rate chosen with the next set of returns in mind.

A sole trader has no employer to pay sick pay, and our page on income protection explains cover that pays a monthly income if illness or injury stops you working.

Latest year, average or lower: how much a sole trader can borrow

The same two tax returns can support three different mortgage sizes, which is why the choice of lender matters more for a sole trader than for an employee.

Step 1. The figures

An illustrative case, not a product or an offer: a sole trader whose accounts run to 5 April, so there is no transition profit, with net profit of £38,000 in 2024 to 2025 and £52,000 in 2025 to 2026. They are buying a £280,000 home with a £28,000 deposit, so the loan needed is £252,000 at 90% loan to value, and they have no other credit commitments. The multiple is 5 times, the standard in Mortgage Lane's experience.

Step 2. The three readings

Each method is applied to the same two years, and each maximum is set against the £252,000 loan.

On identical evidence, the latest-year lender supports £70,000 more borrowing than the lower-year lender and £35,000 more than the average, and it is the only one of the three that covers the £252,000 loan. The monthly payment on that loan is £1,383.76 over 30 years at 5.2%, the illustrative rate used across our guides, which is not a product rate. With a lender that averages, the buyer would need £27,000 more deposit, a cheaper home or another income on the application. Our page on a mortgage for a £50k salary works the same multiples on employed income.

Step 3. When the order reverses

If the years were the other way round, £52,000 in 2024 to 2025 and then £38,000 in 2025 to 2026, the latest year and the lower year are both £38,000. A plain average would still be £45,000 and support £225,000. A lender that switches to the latest year when it is lower reads £38,000, which is how the calculator treats the average, and on that basis all three readings support £190,000. A sole trader whose profit has fallen can borrow on the lower figure or wait for the next return. A lender that will consider it can also be shown, with current-year figures and an accountant's letter, that the fall was a one-off.

Step 4. The expenses decision

Now suppose £5,000 of discretionary spending, such as new equipment claimed as an expense on the cash basis, falls in 2025 to 2026, so the latest year's profit is £47,000 in place of £52,000.

On a latest-year reading the £5,000 costs £25,000 of borrowing, and on an average it costs half that. The lower-year reading does not move, because 2024 to 2025 is still the lower year. The expense also lowers the tax bill, so the question for the accountant is whether discretionary spending can fall outside the year the lender will read.

What decides the case

Match the lender's income method to the shape of the profit: a latest-year lender when profit is rising, an average when it is steady, and current figures with a clear explanation when it has fallen. Once the returns are filed the figures are fixed, and the timing of the application and the choice of lender are the open questions. Our self-employed mortgages page compares sole traders with company directors, contractors and CIS subcontractors doing similar work.