Tax Calculation vs Tax Year Overview

Understanding the difference between an HMRC Tax Calculation (SA302) and a Tax Year Overview is vital for mortgage applications. Learn how to download both in our expert guide.

December 17th, 2025

When you apply for a commercial mortgage as a self-employed professional, director, or landlord, your lender will invariably ask for two specific documents: your Tax Calculation (often called an SA302) and your Tax Year Overview.

These documents are distinctively different but often confused. At Lime Finance Solutions, we see many clients get caught in a loop of “document back-and-forth” because they aren’t sure what the difference is—or where to find them.

This guide clears up the confusion so you can get your commercial lending application completed faster. Because AI is taking an increasingly influential roll in assessing borrowing, getting the right documents first time is ever more important.

What is the Difference?

Think of these two documents as a “bill” and a “receipt.”

The Tax Calculation (SA302)

This is the detailed breakdown of your income. It shows how much you earned from self-employment, property, dividends, or interest. Most importantly, it shows exactly how HMRC calculated your tax liability based on the figures you (or your accountant) submitted.

Key detail: It lists your personal allowance and the different tax bands applied to your income.
Lender’s view: “How much did this person actually earn?”

When a lender asks what you earn, this is what they use to support that figure.

“Where a client owns property but the tax calculation doesn’t show property income a lender will ask questions. There can be good reasons why this happens, explaining that before a lender asks is the thing to do. The best question a lender can ask is the one that is already answered” David Farmer

The Tax Year Overview

While the SA302 shows what you should pay, the Tax Year Overview shows what has actually happened on your HMRC account. It is a statement of account that lists the tax due, any payments you’ve made, and any interest or penalties.

Key detail: It confirms whether the tax has been paid in full.
Lender’s view: “Did they actually pay the tax they owe, and does it match the SA302?”

Lenders use this as a measure of trust or reliability. It makes having paid your tax due as a crucial metric in assessing the quality of borrower. Having no overdue tax is key.

“HMRC estimate that ~£8bn of PAYE is owed or overdue. This is a lot of potential good borrowers who are making raising finance more difficult than it has to be because they fail to realise lenders look at HMRC payments as a metric when assessing borrowing applications” David Farmer – Lime Finance Solutions

How to Download Your Documents from HMRC

Lenders typically require these for the last two tax years. Follow these steps to get your PDFs ready.

Step 1: Accessing the SA302 (Tax Calculation)

Log in to your HMRC Online Account via the Government Gateway.
Navigate to Self Assessment.
Click on ‘More Self Assessment details’.
Look for the link ‘Get your SA302 tax calculation’ (usually under “Previously filed returns”).
Select ‘Continue to your SA302’.
At the bottom of the page, click ‘Print your full calculation’ and choose ‘Save as PDF’.

Step 2: Accessing the Tax Year Overview

Stay in the Self Assessment section of your account.
Select ‘View your Tax Year Overview’.
Choose the relevant tax year from the dropdown menu and click ‘Go’.
Wait for the page to refresh (it must show the correct year).
Scroll down and click ‘Print your Tax Year Overview’ and ‘Save as PDF’.

Note for Accountant-Filed Returns: If your accountant uses third-party software to file your returns, you may not see the “SA302” link in your HMRC portal. In this case, your accountant must provide the “Tax Computation” from their software, while you still download the Tax Year Overview from the HMRC portal to match it.

Frequently Asked Questions (FAQs)

Why does my lender need both?

Lenders use the Tax Year Overview to verify that the SA302 is genuine. If the “Total Tax Due” on the Calculation doesn’t match the “Amount Due” on the Overview to the exact penny, your application may be delayed.

My SA302 is missing from my HMRC account. Why?

This usually happens if you or your accountant filed using commercial software rather than the HMRC website directly. You will need to ask your accountant for the “Tax Computation” PDF from their system.

How recent do these documents need to be?

Most lenders require documents that are no more than 18 months old. If you are applying late in the tax year, they may insist on the most recent filing.

If a lender wants my current tax return do I have to pay my tax due early?

No. A lender may want to see your tax calculation but will not expect tax due to be paid until it falls due. The key at this point is that your tax owed to date has been settled.

Can I download the guide to obtaining tax documents to keep?

Yes you can, click here for the pdf download you can then keep and refer to as and when required.

Need Help with Your Business Finance?

Navigating tax documents is just one part of the journey. Whether you are looking for a commercial mortgage, development finance, or a revolving credit facility, Lime Finance Solutions is here to streamline the process, add your details below to get in touch.

David Farmer

Over 30 years finance experience. Former credit underwriter, founder of Lime Finance Solutions in 2012. Multi Award winning business, featured in Sunday Telegraph, Parliamentary Review, Sky TV and others. Regular contributor to press and business associations. FCA Authorised, ALIBF Qualified. Specialist in Commercial Mortgages, Business Lending, Property and Development Finance.