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Guide

Documentation for self-employed mortgages

Having the right paperwork ready before you apply for a mortgage saves time and reduces stress. This guide covers every document a self-employed borrower might need, how to obtain them, and what lenders are really looking for when they review your financials.

In this guide

What are SA302 tax calculations?

An SA302 is a summary of your income as calculated by HMRC based on your Self Assessment tax return. It shows your total income, tax due, and any payments made. Most mortgage lenders accept SA302s as primary evidence of self-employed income.

You’ll typically need SA302s for the last two to three tax years. Make sure you file your Self Assessment promptly each year — late filing delays SA302 availability and can create unnecessary hold-ups in your mortgage application.

How to get your SA302

HMRC online

  • Log into your Personal Tax Account at gov.uk
  • Go to Self Assessment > More Self Assessment details > Get your SA302
  • Download or print immediately
  • Accepted by most lenders
  • Free and instant

Request by post

  • Call HMRC Self Assessment helpline (0300 200 3310)
  • Takes 2–4 weeks to arrive
  • Official HMRC-stamped document
  • Accepted by all lenders
  • Useful if you can’t access your online account

What are tax year overviews?

A tax year overview is a snapshot of your tax position for a specific year. It shows the tax charged, payments made, and any balance due. Lenders use it alongside your SA302 to verify that the figures match and that your tax affairs are in order.

You can download tax year overviews from your HMRC online account. They’re available for each year you’ve filed a Self Assessment return. Like SA302s, you’ll typically need the last two to three years.

What do accountant’s certificates need to include?

  • ACA, ACCA, or CIMA qualified
  • Some lenders also accept AAT members in practice
  • Must be on the accountant’s headed paper with their registration number

Company accounts for limited company directors

If you’re a limited company director, lenders will want to see your company’s full statutory accounts in addition to your personal SA302s. These should be prepared by a qualified accountant and typically cover the last two to three financial years.

Lenders examine the company accounts to understand the business’s profitability and whether your declared salary and dividends are sustainable. If you retain significant profits in the company rather than drawing them, some lenders will factor in retained earnings, which can boost your borrowing capacity.

What do lenders look for in bank statements?

What lenders like to see
  • Regular income deposits matching your declared earnings
  • Consistent saving behaviour
  • Manageable and predictable spending patterns
What raises concerns
  • Gambling transactions (even small ones can flag)
  • Frequent use of overdraft facilities
  • Unexplained large deposits or withdrawals
  • BNPL payments or payday loan activity

Proof of future contracts (for contractors)

If you’re a contractor, some lenders will want evidence of ongoing or future work. This is particularly important for lenders who assess income based on your contract rate rather than historic accounts.

Provide a copy of your current contract showing the day rate, start and end dates, and the client’s name. If your contract is due for renewal, a letter of intent or history of previous renewals can also help. Most lenders want to see at least six months remaining on your contract, or a pattern of continuous renewals.

Your self-employed documentation checklist

Before your first broker meeting

  1. Download SA302s and tax year overviews

    For the last 2–3 tax years from your HMRC online account.

  2. Get your latest accounts from your accountant

    Full accounts for limited companies; profit and loss for sole traders.

  3. Gather personal and business bank statements

    Last 3–6 months for both. Download as PDFs from your online banking.

  4. Prepare proof of identity and address

    Passport or driving licence, plus a recent utility bill or council tax statement.

  5. Collect evidence of your deposit

    Savings statements, or documentation of where your deposit funds come from.

  6. Note your business details

    Trading name, company number, date trading started, and your accountant’s details.

More guides in our self-employed mortgage hub.

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