How to View Past Self Assessment Tax Returns: SA302s, Tax Year Overviews & the Software Filing Trap

Whether you’re applying for a mortgage, checking a figure from a previous year, or simply need proof of income, viewing a past Self Assessment return should be straightforward — and mostly is, once you know where to look. The genuine confusion most guides skip over: if you filed through commercial software rather than HMRC’s own website, HMRC won’t generate an SA302 for you directly. It points you back to the software instead, which catches out a meaningful number of self-employed people who assume the HMRC portal always has everything.

This guide covers how to view and download past Self Assessment returns, SA302s, and Tax Year Overviews, the software filing trap, and what to do if something’s missing.

Quick Answer

You can view your past four years of Self Assessment returns and get SA302 tax calculations through your HMRC online account, available 72 hours after filing. Log in, go to Self Assessment, then “More details about your Self Assessment returns and payments,” and select the tax year you need. There’s one genuine catch: HMRC only generates the SA302 directly for returns filed through its own website — if your return was filed through commercial accounting software (common if you use an accountant), you’ll need to get the SA302 from that software or your accountant instead. A separate Tax Year Overview, confirming HMRC has processed your figures, is available from HMRC regardless of how you filed, and is usually required alongside the SA302 for mortgage applications.

Key Takeaways

• You can view and download up to 4 years of past Self Assessment returns and SA302 calculations through your HMRC online account.
• Documents become available to print 72 hours after you submit your Self Assessment return.
• If your return was filed through commercial software rather than HMRC’s own website, HMRC won’t generate the SA302 — you need it from the software provider or your accountant instead.
• A Tax Year Overview is a separate document, available regardless of how you filed, confirming HMRC has processed your figures — most lenders want both documents together.
• Since February 2026, HMRC online services use GOV.UK One Login rather than the older Government Gateway sign-in, which can confuse anyone returning after a long gap.
• A combination of online and paper documents across different years is generally acceptable to mortgage lenders.

Table of Contents

1. Viewing a Past Self Assessment Return
2. Getting Your SA302 Tax Calculation
3. The Software Filing Trap
4. Tax Year Overview: What It Is and Why You Need Both
5. GOV.UK One Login: What Changed in February 2026
6. Using These Documents for a Mortgage Application
7. Self-Employed Applicants in London: What We See
8. A Worked Example: The Software Filing Confusion
9. How Much Does It Cost?
10. Common Mistakes People Make
11. Accountant Insights: What We See in Practice
12. Do You Need Help? (Decision Framework)
13. DIY vs Getting Your Accountant to Help
14. Checklists
15. FAQs
16. Sources
17. Final Thoughts

Viewing a Past Self Assessment Return

Log in to your HMRC online account, go to Self Assessment, then select “More details about your Self Assessment returns and payments,” and choose the tax year you need from the list. Selecting “View return” shows the complete return exactly as submitted — income, allowances, and the tax calculation — for any of the last four tax years. Each tax year runs from 6 April to 5 April the following year, so a return labelled “2025–26” covers income earned between 6 April 2025 and 5 April 2026.

Getting Your SA302 Tax Calculation

The SA302 is HMRC’s official summary of your tax calculation for a given year, most commonly requested by mortgage lenders as proof of self-employed income. To get it: log in to your HMRC online account, select Self Assessment, then “More details about your Self Assessment returns and payments,” and follow the link to get your SA302 Tax Calculation for the year you need. It can only be printed or saved 72 hours after you originally submitted the return for that year, so requesting it immediately after filing won’t work — HMRC needs that processing window first.

The Software Filing Trap

This is the detail most guidance glosses over, and it catches out a genuinely significant number of self-employed people. HMRC only generates the SA302 directly where the return was filed through HMRC’s own online service. If your return was filed through commercial accounting or tax software — which is extremely common if you use an accountant, or file yourself through platforms like TaxCalc, FreeAgent, or similar — HMRC’s system won’t show an SA302 for that year at all. Instead, it points you back to whichever software was used to file. This isn’t an error and doesn’t mean anything has gone wrong with your filing; it simply means the SA302 needs generating from the software (or requesting from your accountant) rather than downloading directly from HMRC.

Tax Year Overview: What It Is and Why You Need Both

A Tax Year Overview is a separate document from the SA302, produced by HMRC once your return has been processed, confirming the tax due or refund owed for that year. Unlike the SA302, it’s available from HMRC regardless of whether you filed directly or through software, since it reflects HMRC’s own processed record rather than the filing method. Lenders typically want both documents for the same year together: the SA302 shows what was declared, while the Tax Year Overview confirms HMRC has actually processed and accepted those figures — an SA302 alone can technically still be amended, which is why the pairing matters for verification purposes.

GOV.UK One Login: What Changed in February 2026

Since 9 February 2026, HMRC’s online services have moved from the older Government Gateway sign-in to GOV.UK One Login, the government’s newer single sign-on system used increasingly across public services. If you haven’t logged in for a while, you may need to set up a One Login account and re-link it to your existing tax record rather than simply signing in with your old Government Gateway details — worth doing in advance of needing a document urgently, since account linking can take a little longer than a routine login the first time.

Using These Documents for a Mortgage Application

Most mortgage lenders ask for 2–3 years of SA302s and matching Tax Year Overviews when assessing a self-employed applicant, though the exact number depends on the lender and how stable your income looks. A combination of online-printed and HMRC-issued paper originals across different years is generally acceptable — paper copies can be requested by phone from HMRC (or by your accountant on your behalf) if you don’t have online access for an older year. Some specialist lenders or more complex cases may also ask for the full SA100 return itself, downloadable the same way as the SA302 for returns filed directly with HMRC.

Self-Employed Applicants in London: What We See

London has the highest self-employment rate of any UK region at 16.5%, well above the 13.1% national average, and combined with the capital’s higher property prices, that means a disproportionately large number of London mortgage applications rely on SA302s and Tax Year Overviews rather than standard payslips. For London-based self-employed applicants, the software filing trap is worth being especially aware of, given how commonly professional services and consultancy businesses in the capital work through an accountant using commercial filing software rather than HMRC’s own portal.

A Worked Example: The Software Filing Confusion

Illustrative Example: Say a self-employed consultant has used the same accountant for three years, who files their return through professional tax software rather than HMRC’s website. Applying for a mortgage, the applicant logs into their HMRC account expecting to download an SA302 the way a colleague described, but finds no SA302 option available for any of the three years. Nothing is wrong with their tax affairs — the returns were filed correctly and on time — but because filing went through software rather than HMRC directly, the SA302 simply needs requesting from the accountant instead, who can generate it from the same software used to file.

Illustrative Example: The Tax Year Overview for those same three years, by contrast, downloads without any issue directly from the applicant’s HMRC account, since it’s generated from HMRC’s own processed records regardless of filing method — illustrating exactly why the two documents behave differently and why understanding this distinction in advance avoids a stressful last-minute scramble during a mortgage application.

How Much Does It Cost?

Common Mistakes People Make

1. Assuming HMRC always has an SA302 available directly
Why it happens: Most general guidance describes the HMRC download route without mentioning the software exception.
Consequence: Confusion or panic when the SA302 option simply isn’t there for a year filed through software.
How to avoid it: Know in advance whether your returns were filed directly with HMRC or through accounting software.

2. Requesting documents within 72 hours of filing
Why it happens: It’s natural to expect the document to be available immediately after submission.
Consequence: A blank or unavailable download, mistaken for an error.
How to avoid it: Wait the full 72 hours after filing before trying to print or save your SA302 or Tax Year Overview.

3. Providing only the SA302 without the matching Tax Year Overview
Why it happens: The SA302 looks like the complete picture on its own.
Consequence: A mortgage application delayed while the lender requests the missing Tax Year Overview.
How to avoid it: Always provide both documents together for each year requested.

4. Getting locked out after the February 2026 login change
Why it happens: Returning users may not realise Government Gateway sign-in has moved to GOV.UK One Login.
Consequence: Delay setting up access exactly when documents are needed urgently.
How to avoid it: Set up and link your GOV.UK One Login in advance of any deadline, not at the last minute.

5. Not realising documents are only available for 4 years online
Why it happens: It’s easy to assume online access covers your entire filing history.
Consequence: Discovering an older year isn’t available online when a lender asks for it.
How to avoid it: Request paper copies for anything beyond the 4-year online window well in advance.

Accountant Insights: What We See in Practice

• The software filing trap is, in our experience, the single most common point of confusion for clients requesting these documents — it’s rarely explained clearly anywhere until someone actually hits it.
• Clients who ask their accountant for SA302s and Tax Year Overviews together, in one request, get a smoother mortgage application process than those requesting them piecemeal.
• The February 2026 GOV.UK One Login transition has generated a genuine spike in access queries from clients who hadn’t logged into their HMRC account in some time.
• London-based self-employed clients applying for larger mortgages are disproportionately affected by the software filing trap, given how common accountant-managed filing is among the capital’s professional services and consultancy businesses.
• Requesting documents well ahead of a mortgage deadline, rather than at the point an offer is close, consistently avoids unnecessary last-minute stress.

Do You Need Help?

Step 1: Confirm how your returns were filed. Directly through HMRC, or through commercial software or an accountant.

Step 2: Log into your HMRC account (via GOV.UK One Login) to check availability. Set this up in advance if you haven’t logged in recently.

Step 3: Request both the SA302 and Tax Year Overview together for each year needed. Lenders typically want both.

Step 4: If filed through software, contact your accountant directly. They can generate the SA302 from the same platform used to file.

Step 5: Request paper copies for anything beyond the 4-year online window. Do this well ahead of any deadline.

DIY vs Getting Your Accountant to Help

Checklists

Checklist 1: Before Requesting Documents

• ✓ Confirm which years you need (usually the last 2–3 for a mortgage)
• ✓ Check whether returns were filed directly with HMRC or through software
• ✓ Set up GOV.UK One Login in advance if you haven’t logged in recently
• ✓ Wait 72 hours after filing before requesting current-year documents

Checklist 2: For a Mortgage Application

• ✓ Gather both SA302 and Tax Year Overview for each year requested
• ✓ Confirm with your lender whether printed or paper-original copies are acceptable
• ✓ Request paper copies from HMRC for any year beyond the 4-year online window
• ✓ Ask your accountant to generate SA302s if returns were filed through software

FAQs

How far back can I view my Self Assessment tax returns online?
Up to 4 years through your HMRC online account; older years require requesting a paper copy from HMRC.

Why can’t I find my SA302 on the HMRC website?
HMRC only generates the SA302 directly for returns filed through its own online service — if you filed through commercial software or via an accountant, you’ll need to get it from them instead.

What is a Tax Year Overview and how is it different from an SA302?
The SA302 shows your declared tax calculation; the Tax Year Overview confirms HMRC has processed and accepted those figures. Lenders usually want both for the same year.

How long after filing can I print my SA302?
72 hours after you submit your Self Assessment return for that year.

What changed with HMRC login in 2026?
Since 9 February 2026, HMRC online services use GOV.UK One Login instead of the older Government Gateway sign-in.

How many years of SA302s do mortgage lenders usually want?
Typically 2–3 years, though this varies by lender and depends on how stable your income appears.

Can my accountant get these documents for me?
Yes — your accountant can act as your agent to access or generate these documents, and can request paper copies from HMRC by phone on your behalf.

Can I use a mix of online and paper documents for a mortgage application?
Generally yes, provided each individual year’s SA302 and Tax Year Overview are properly matched and accepted by the lender.

Do I need the full SA100 return, or just the SA302?
Most lenders only need the SA302 and Tax Year Overview; the full SA100 is occasionally requested by specialist lenders or for more complex cases.

What if I’ve never logged into my HMRC online account before?
You’ll need to register and set up GOV.UK One Login, which can take a few days if identity verification is required — worth starting well before any deadline.

Sources

• GOV.UK — Get your SA302 tax calculation
• GOV.UK — Sign in to your HMRC online account
• GOV.UK — GOV.UK One Login
• GOV.UK — Self Assessment tax returns

HMRC processes, login systems, and document retrieval windows are subject to change — always confirm current guidance on GOV.UK before relying on it.

Final Thoughts

Viewing a past Self Assessment return is usually straightforward, but the SA302’s software filing exception catches out enough people that it’s worth knowing about before you need the document urgently — particularly with a mortgage deadline attached. Combined with the recent move to GOV.UK One Login, a few minutes spent confirming access in advance saves considerable stress when the document is actually needed.

Need help pulling together your tax documents for a mortgage or other purpose? Get in touch and we’ll sort it quickly, or see our full pricing guide.