Income · 10 min read
Self-employed and preparing for a mortgage? Start with the evidence
In short
There is no single UK ‘self-employed mortgage form’. Depending on your trading structure and the lender, the evidence route can involve HMRC tax calculations (SA302s) and tax year overviews, finalised accounts, bank statements, or a lender’s own accountant’s certificate. HMRC says SA302s and tax year overviews may be requested as mortgage income evidence; the FCA requires lenders to evidence income they rely on but does not prescribe one form or one fixed period. Current lender criteria show the variation: Nationwide publishes an accountant’s-certificate route alongside SA302 and tax-year-overview evidence, while Halifax publishes tax-calculation or accounts routes and may request business bank statements. Those are lender-specific examples, not market-wide rules. Start by identifying your trading structure and the records you already hold, then check the exact requirement for your lender.
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Educational preparation only. Requirements vary by lender and by trading structure. Nothing here tells you whether an application will be accepted, what income a lender will use, or which documents will be sufficient.
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What this guide cannot tell you
- Whether a lender will accept an application from you, or what figure any lender would work from.
- How a particular lender assesses salary, dividends, retained profit, day rates or a partnership share — that is each lender's own approach.
- How many years of accounts or returns any lender wants. MCOB 11.6 sets no period and we will not invent one.
- Whether you should apply now or wait for another set of figures.
- What we can do is help you identify and organise the records that already exist, so a suitably qualified FCA-authorised mortgage adviser can work from facts.
Who this is for
- Sole traders and business partners
- Directors and shareholders of their own limited company
- Contractors working through a company or an intermediary
- Anyone whose trading structure or income pattern has changed recently
Your structure decides which records exist
Facts and documents worth having ready for each structure. This is not a list of lender requirements, and no row states a period, a formula or an acceptability rule.
Sole trader
- When you started trading, and what the business does.
- Self Assessment records: HMRC requires records of business income and expenses plus personal income, with supporting proof such as invoices and bank statements.
- Any SA302 tax calculations and tax year overviews you can download — GOV.UK says these are available for the last 4 years after you have filed.
- Business and personal bank statements you already hold, and which periods they cover.
Partnership
- Your share of the partnership and from what date.
- The partnership's own records — the nominated partner is responsible for those — alongside your personal Self Assessment records.
- Your own SA302 tax calculations and tax year overviews, if filed.
- Which accounting periods are finalised, and when the next filing falls.
Limited-company director or shareholder
- Your role, your shareholding, and the company's incorporation date.
- The company's accounting records; GOV.UK says company finances are kept clearly separate from the personal finances of owners and directors, including separate banking.
- Statutory annual accounts, which GOV.UK says generally include a balance sheet, a profit and loss account and notes, subject to company-size and exemption rules.
- Your personal Self Assessment records, SA302 tax calculations and tax year overviews.
- Three different figures written down separately, and clearly labelled: company turnover; company profit; and what you personally received, split into salary and dividends.
Contractor
- Your current contract: who it is with, the rate, how you are paid, its start date and its stated end date.
- Previous contracts you already hold, as a factual history of the work you have done — not a requirement, and we state no minimum.
- Your payment structure: whether you invoice through your own company, work through an intermediary or agency, or are paid another way.
- Any gaps between contracts, noted as dates rather than explained away.
- Whichever tax records apply to how you are actually paid — company records, Self Assessment records, or both.
Facts only. We give no day-rate calculation, no multiple, no minimum trading history and no statement of which figure a lender would use. Those are questions for a lender or a qualified adviser.
Key points
Is an accountant certificate or accountant reference always required?
No universal rule says every self-employed mortgage applicant needs one. Current lender practice varies. Accord publishes separate accountant-reference forms for sole traders and limited companies; Chorley Building Society also publishes separate sole-trader/partnership and limited-company forms; Saffron says that if it requires an accountant certificate or reference it contacts the applicant's accountant directly. ICAEW guidance also recognises that accountants are asked for financial-status references and sets professional cautions around what they can properly confirm. If a lender or adviser says a reference is needed, ask for that lender's own form or exact questions rather than commissioning a generic certificate.
Evidence of declared income, not self-certification
MCOB 11.6 requires a lender that takes income into account to obtain evidence of the income declared, and says self-certification is not acceptable. It also says the evidence must be of a type, and cover a period, that is adequate to support each element of income relied on — and that what is adequate varies with employment status, the nature and length of the work, and whether any of the income is not contractually guaranteed. The lender remains responsible for meeting those rules.
Your trading structure changes which records exist
HMRC requires sole traders and business partners to keep records of business income and expenses for Self Assessment, plus records of personal income, with supporting proof such as invoices and bank statements. A limited company is a separate legal entity: GOV.UK says there must be a clear division between company finances and the personal finances of its owners and directors, that company banking is kept separate from personal banking, and that the company keeps accounting records. Those are different duties, and the company rules are not sole-trader rules.
HMRC tax documents you can obtain yourself
After you have filed a Self Assessment return, GOV.UK says you can get an SA302 tax calculation and a tax year overview for the last 4 years, and that you might be asked for them as evidence of income when applying for a mortgage while self-employed. GOV.UK also says to check with the mortgage provider that a self-printed copy is acceptable. An SA302 shows what was calculated on a return; it is not a statement of what any lender will conclude, and it does not stand in for accounts or bank statements unless that lender says so.
SA302 tax calculation and tax year overview: two different documents
They are often mentioned together but they are not the same thing. GOV.UK describes the SA302 as the tax calculation produced from the Self Assessment return you filed — what was calculated for that tax year. The tax year overview is HMRC's own record of that tax year as it sits on your account. Both are available for the last 4 years once a return has been filed, and GOV.UK names the mortgage situation as an example of when you might be asked for them. What we do not say is that both are always required, or required for the same years: GOV.UK's own advice is to check with the mortgage provider what it will accept, including whether a self-printed copy is acceptable.
Is there one self-employed mortgage form?
No. The phrase can mean several different things. A mortgage application form is the lender’s application; an SA302 is HMRC’s tax calculation; a tax year overview is a separate HMRC record; and an accountant’s certificate, where a lender uses one, is a lender-specific evidence route. Nationwide’s current intermediary criteria, for example, say self-employed income can be evidenced using the latest two years’ HMRC tax calculations with corresponding tax year overviews or an accountant’s certificate. That is Nationwide’s current policy, not a standard form used by every lender.
What is an accountant’s certificate for a mortgage?
It is not an HMRC form and there is no single industry-wide certificate. It is a way a particular lender may choose to verify self-employed income. Nationwide’s current intermediary criteria say that, where it uses this route, the certificate must include details covering a minimum two-year trading period; Nationwide sends its certificate directly to the applicant’s accountant, and sets its own requirements for who can prepare and sign it. Another lender can use a different evidence route or different rules, so do not ask an accountant to prepare a generic certificate and assume it will be accepted.
SA302, tax year overview, accounts and accountant’s certificate: what is the difference?
They are different records. GOV.UK describes the SA302 as the tax calculation produced from a filed Self Assessment return, while the tax year overview is a separate HMRC record for that tax year. Business or company accounts are financial records of the business or company. An accountant’s certificate is a lender-specific verification document where that lender offers such a route. One document should not be treated as another, and there is no universal rule saying one of them always replaces the others.
Can a lender ask for business bank statements as well?
Yes, depending on that lender’s criteria and the case. Halifax’s current intermediary criteria say the latest three months’ statements for the account used for business purposes may be required alongside its self-employed evidence routes. Its separate one-year self-employed assessment can also request the latest three months’ business and personal bank statements. That is a Halifax-specific example of why ‘proof of income’ can involve more than one document; it is not a universal three-month rule.
Turnover, company profit and your personal income are three different figures
Turnover, profit and the money you personally received are distinct figures that appear in different places in your business or company records and in your personal records. For a company, figures reported by the company belong to the company, which is a separate legal entity, rather than to you personally. What you personally received is a third figure again — for a director that is typically salary plus any dividends. GOV.UK is explicit that a limited company is a separate legal entity and that company finances are kept clearly separate from the personal finances of its owners and directors. Mixing these figures up is the most common source of confusion in a self-employed conversation. Which figure or combination any lender works from is that lender's own assessment: MCOB 11.6 does not prescribe one calculation, and neither do we.
What company accounts are
GOV.UK explains that a private limited company's statutory annual accounts are prepared from its financial records and generally include a balance sheet, a profit and loss account and notes, subject to company-size and exemption rules. That describes the documents themselves. It says nothing about which lenders ask for them, for how long, who has to prepare them, or how any figure inside them is read.
Future income projections are permissive, not promised
MCOB 11.6 says a firm may wish to consider projections of future income for a self-employed customer where these form part of a credible business plan. That is something a lender may choose to do — not something you can expect, request or rely on.
Exceptions and things that vary
- Sole trader, partnership and limited-company records are genuinely different documents; guidance written for one structure does not transfer to another.
- In a partnership, the nominated partner has responsibility for the partnership's own records, alongside each partner's personal Self Assessment records.
- Contractors may hold contracts, company records or agency paperwork rather than trading accounts, so the record set can look different again.
- If you have changed structure recently — for example incorporating — your records may span two different regimes for the same period.
- MoneyHelper's consumer guidance lists accountant statements or accounts and SA302 calculations among documents commonly requested, and says requirements vary. Any period it gives is its own consumer example of a common request, not a rule.
How to work through it
Write down your trading structure
Our suggestion: state plainly whether you are a sole trader, a partner, a company director or shareholder, or contracting through a company or intermediary, and from what date. Everything else follows from that.
Gather the records you actually hold
Our suggestion: collect what already exists rather than creating anything new — Self Assessment records, any SA302 tax calculations and tax year overviews you can download, business and personal bank statements, and any company accounting records or filed accounts if you run a company.
Note your tax and accounting periods and filing dates
Our suggestion: write down which periods your records cover, which are finalised, and when your next filing falls. That lets you answer questions about periods accurately instead of estimating.
Prepare a short factual explanation of material changes
Our suggestion: two or three sentences on anything a reader of your records would notice — a change of structure, a quieter period, a new contract — stated as fact and traceable to a record you hold.
Ask exactly what evidence and period are required
Because MCOB 11.6 leaves the adequate evidence to the lender's assessment, the only reliable answer comes from asking the lender or a suitably qualified FCA-authorised mortgage adviser which documents, in which format, covering which periods, they want from someone with your structure.
Illustrative example (not a real case)
Imagine a sole trader who writes down when they started trading, downloads the SA302 tax calculations and tax year overviews available to them from HMRC, saves the business and personal bank statements they already hold, and adds a two-sentence note about a quieter quarter caused by a planned break. They then ask an adviser which of those documents, and which periods, are needed. Nothing is invented and nothing is assumed. Illustrative only.
Illustrative only. Figures and situations in examples are made up to show a method. They are not typical, not a benchmark and not a prediction of any outcome.
What not to assume
- Do not assume any fixed number of trading or accounting years applies across the market — MCOB 11.6 sets no period, and the adequate evidence depends on circumstances and on the lender.
- Do not assume accounts are always requested, or that they have to be prepared by any particular person, or that any particular qualification is required of whoever prepares them. Our sources do not say so.
- Do not assume a particular format is required; GOV.UK specifically says to check with the mortgage provider whether a self-printed HMRC document is acceptable.
- Do not assume any conclusion about how draft or unfiled records, or profits left in a company, are read — that is a lender assessment we cannot describe for you.
- Do not assume HMRC's sole-trader record-keeping duties describe what a limited company or its director must do, or the reverse.
- Do not assume an SA302 on its own settles anything about what you can borrow.
- Do not reshape legitimate tax or business decisions in order to look more 'mortgageable'. Changing how you pay yourself, delaying legitimate expenses or filing differently to present a particular picture can have tax, company-law and business consequences that outlast any application, and we cannot tell you it would make any difference to a lender. Take tax decisions on tax grounds, with an accountant or tax adviser.
- Do not assume ‘self-employed mortgage form’ is the name of one standard document. It can refer loosely to the application itself, HMRC evidence or a lender-specific certificate.
- Do not assume an accountant’s letter or certificate you already hold will satisfy a lender that uses its own accountant-certificate process.
- Do not assume an accountant’s certificate, SA302, tax year overview, accounts or bank statements are interchangeable. Current lender criteria show different routes and combinations.
Your self-employed preparation record
One page, written from documents you already hold. If you run a company, keep the company figures and your personal figures visibly separate on it.
- Your structure, and from what date: sole trader, partner, company director or shareholder, or contractor — and how you are actually paid.
- Which periods your records cover, which are finalised and filed, and when the next filing falls.
- The HMRC documents you can download today: SA302 tax calculations and tax year overviews, and for which tax years.
- If you run a company: turnover, company profit, and separately your salary and your dividends — each labelled, each traceable to a record.
- If you contract: the current contract, its rate, its dates, how you are paid, and the earlier contracts you hold.
- The bank statements you hold, business and personal, and the periods they cover.
- Two or three factual sentences on anything a reader of your records would notice, such as a change of structure or a quieter period.
Keep this record with your documents and update it whenever a filing or tax year closes.
Questions for a qualified adviser
We cannot answer these for you, and we do not introduce or recommend advisers. Take them to a suitably qualified FCA-authorised mortgage adviser of your own choosing.
- For my trading structure, which documents and which periods do you need to see?
- Which of the HMRC documents I can download would you accept, and in what format?
- How does this lender assess salary and dividends taken from my own company, and how does it treat company profit?
- For contract work, what would you want to see about the contract itself, the rate and the history?
- How would you want a recent change in my structure or income pattern explained and evidenced?
- Does the timing of my next tax or accounts filing affect how I should plan?
- Is there anything about how I take income from my business that you would want to discuss first?
- When you say ‘self-employed evidence’, do you mean HMRC tax calculations and tax year overviews, finalised accounts, a lender-specific accountant’s certificate, bank statements, or a combination?
- If an accountant’s certificate is needed, does this lender issue its own form, what period must it cover and who is allowed to sign it?
Optional free depth
Self-Employed Mortgage Evidence Preparation Pack
An evidence organiser for sole traders, partners and company directors: what to gather, how to describe your trading structure once and clearly, and how to separate business from personal so nobody has to guess.
Printable and completed by you. Nothing you write in it is sent to us, and it is not advice or an eligibility assessment.
Related reading
Sources
Primary and official sources used for the factual information on this page.
- FCA Handbook MCOB 11.6 — Responsible lending, and responsible financing of home purchase plans. Checked 22 August 2026.
- GOV.UK (HMRC) — Get your SA302 tax calculation. Checked 22 August 2026.
- GOV.UK (HMRC) — Business records if you're self-employed: overview. Checked 22 August 2026.
- GOV.UK (HMRC) — Business records if you're self-employed: what records to keep. Checked 22 August 2026.
- GOV.UK — Running a limited company: company and accounting records. Checked 22 August 2026.
- GOV.UK — Prepare annual accounts for a private limited company: overview. Checked 22 August 2026.
- MoneyHelper — How to apply for a mortgage (consumer orientation). Checked 22 August 2026.
- MoneyHelper — What mortgage can I afford? (consumer orientation). Checked 22 August 2026.
- Accord Mortgages — Forms and factsheets: separate sole trader and limited company accountant references. Checked 5 October 2026.
- Chorley Building Society — Supporting documents: accountant reference forms for sole trader/partnership and limited company applicants. Checked 5 October 2026.
- Saffron for Intermediaries — Lending criteria: accountant certificate/reference process. Checked 5 October 2026.
- ICAEW — References on clients' financial status. Checked 5 October 2026.
- Nationwide for Intermediaries — Self-employment income: HMRC tax-calculation/tax-year-overview and accountant’s-certificate evidence routes (Nationwide-specific). Checked 17 September 2026.
- Halifax Intermediaries — Lending criteria: self-employed keying/evidence and one-year self-employed assessment (Halifax-specific). Checked 17 September 2026.
Written by
Before You Apply editorial
Written by the publisher's editorial function, not by a named individual and not by a mortgage adviser. Before You Apply is not FCA authorised.
Editorial accountability
Published by Before You Apply, which is responsible for this guide. See About, editorial policy and corrections.
- First published 2026-08-31
- Last updated 2026-10-05
- Last fact-checked 2026-10-05
- Next review due 2026-11-05
Disclosure: this guide is educational. Before You Apply receives no payment for mentioning any lender, product or firm. Any named examples are used for factual context, not ranking or recommendation.
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