The SA302 is HMRC's formal tax calculation summary for a given tax year, produced from the data on the filed Self-Assessment return. Most UK mortgage lenders treat the SA302 as the gold-standard proof of self-employed and director income, and most self-employed mortgage applications stall at the SA302 stage because the borrower cannot produce the documents in the format and combination the lender requires.
This piece walks the SA302 structure, the Tax Year Overview (TYO) document that always accompanies it, the three years lenders typically require, the digital download method, and the timing pitfalls that catch self-employed borrowers out. See also [the broader Self-Assessment trigger picture](/blog/who-needs-to-file-self-assessment-2026/) for who needs to file in the first place.
What an SA302 contains
An SA302 is a one-to-two-page summary showing total income, total tax, and the breakdown by source (self-employment profit, property income, dividends, employment income, pension income, savings interest, capital gains) for a specific tax year. It carries HMRC's branding and the taxpayer's UTR. It is the closest UK equivalent to a P60 for self-employed and director income, and lenders expect to see it accompanied by the matching Tax Year Overview to prove the tax was actually paid.
The Tax Year Overview
A Tax Year Overview (TYO) is a separate document showing tax due, tax paid, and balance for the year, also produced by HMRC. The SA302 shows what the calculation says the tax is; the TYO shows that the calculation has been settled with HMRC. Mortgage lenders require both documents together, for each tax year, because the SA302 alone proves declared income but not paid tax. A borrower with an SA302 showing £45,000 of profit but a TYO showing £8,000 of tax still owed triggers an immediate underwriting query.
How many years lenders typically want
| Borrower type | Years required | Notes |
|---|---|---|
| Self-employed sole trader, established 3+ years | 3 most recent years | Lenders average the three years or use latest |
| Self-employed, 2 years | 2 most recent years | Limited lender pool, often only specialist lenders |
| Self-employed, 1 year | 1 year + projections | Very limited, specialist only |
| Limited company director | 2-3 years of SA302 + 2-3 years of company accounts | Lenders model salary + dividends or salary + net profit share |
| Mixed PAYE and self-employed | 3 years SA302 + P60s | Lenders may weight either source higher depending on policy |
Downloading SA302 from HMRC online
- Log in to the Government Gateway personal tax account.
- Navigate to "Self Assessment" → "More Self Assessment details".
- Select "Get your SA302 tax calculation" for the year required.
- Print or save as PDF. The browser print-to-PDF option is the standard route; native PDF download is not available.
- Separately access "View your Tax Year Overview" for the matching year.
- Print or save the TYO as a separate PDF.
HMRC does not produce a single combined SA302 + TYO document. Borrowers consistently send only one of the two and have to be asked for the second by the lender, which adds a week or more to the underwriting timeline.
What if the SA302 download is not available
SA302 documents are usually available approximately 72 hours after the Self-Assessment return is filed and processed. A return filed on 31 January typically produces a downloadable SA302 by 3-4 February. Returns under enquiry or amendment may not produce an SA302 until the enquiry concludes. In that case, the alternative is a "commercial software substitute" produced by the accountant's tax filing software (Iris, TaxCalc, BTCSoftware), which most lenders accept as long as it includes the same data fields and a TYO is provided alongside.
The "lender accepts accountant's certificate" alternative
Some lenders accept an accountant's certificate of income in place of SA302s, particularly for limited company directors where the lender wants net profit share rather than personal income. The certificate is typically a one-page letter from a qualified accountant (ACCA, ICAEW, CIMA, ATT) on letterhead, stating income figures with reference to the underlying accounts. Lenders that accept this route are usually specialist mortgage providers; most high street lenders insist on HMRC documents.
Mortgage timing and Self-Assessment filing
Self-employed borrowers planning a mortgage application benefit materially from filing Self-Assessment for the previous tax year in May or June rather than waiting until the 31 January deadline. A return filed in May 2026 for the 2025-26 tax year produces an SA302 available throughout the late 2026 mortgage application window, with the matching TYO showing the tax fully paid (or, more typically, only the two Payments on Account paid with the balancing settlement still pending — which is normal and lenders understand).
My business income spikes and falls; how do lenders treat that?
Lenders typically use the average of the three most recent SA302 figures, or the latest year, or 80% of the latest year — depending on lender policy. A borrower with three years of £45k, £55k, and £75k may see lenders use £58k (average) or £75k (latest, more generous lenders) or £60k (latest at 80%, conservative lenders). A trend of rising income generally works in the borrower's favour; a falling trend triggers questions about sustainability. The lender pool is materially wider for borrowers showing stable or growing income.
Do directors of a limited company need SA302 or company accounts?
Both, usually. The SA302 shows personal income (salary plus dividends declared). The company accounts show net profit share, which some lenders use as a higher denominator than dividends actually drawn. A director earning a £12k salary and drawing £30k of dividends from a Ltd with £80k of net profit might be assessed on £42k (salary + dividend), £92k (salary + net profit), or somewhere between depending on the lender. The choice of lender materially affects the borrowable amount, often by £100k+ on the mortgage offer.
What if I have not yet filed last year's return?
A mortgage lender typically requires SA302s for the most recently completed tax year. A borrower applying in September 2026 will be expected to have filed the 2025-26 return and have the SA302 available. The "you have until 31 January" deadline is irrelevant; lenders will not accept "the return is not due yet" as a reason for missing documentation. Filing the prior-year return in May or June 2026 is a practical prerequisite for autumn 2026 mortgage activity.
Find a vetted Harrow accountant who handles Self Assessment returns — free matching, no obligation.
Self Assessment Tax Returns in HarrowThis article reflects current HMRC guidance as of April 2026. Key references: HMRC Self Assessment overview, HMRC SA returns collection. Tax rules change annually. Always verify deadlines and thresholds at gov.uk or with a qualified accountant.
Our editorial team includes ACCA-qualified accountants and tax writers with experience across self-employment, rental income, and HMRC compliance. All articles are reviewed annually against current HMRC guidance and updated where rules change.