SA302 Form: Your HMRC Tax Calculation for Mortgages and Loans

An SA302 is HMRC’s official Self Assessment tax calculation — the document that turns your tax return into a clear “here’s your income, here’s your tax” summary for a specific tax year.

It’s not flashy, but it’s useful: it shows the figures HMRC has used (income, allowances, tax due), and it’s the bit of paperwork that tends to get treated as “proper evidence” when someone needs to understand your income. In practice, it’s often paired with the Tax Year Overview, which confirms the return is on HMRC’s system and matches what’s been processed.

What is an SA302?

An SA302 is HMRC’s official Self Assessment tax calculation for a specific tax year. It’s the “final maths” page: it summarises your total income, taxable income, allowances and reliefs, and the income tax due (including whether you’re due a repayment).

• It’s produced once your Self Assessment tax return has been processed (if you filed online via HMRC, you usually can’t print it until 72 hours after submission).
• It’s widely used by mortgage lenders and other providers as evidence of earnings for self-employed people, sole traders, and small business owners—basically anyone without regular payslips—so they can sanity-check your declared income against HMRC records.
• It’s not the same as a Tax Year Overview: the SA302 shows what you owe based on the return; the Tax Year Overview shows what HMRC has recorded for that year (including payments made).

In short: if you need something official that says, “This taxpayer declared X, and HMRC calculated Y,” the SA302 is the piece of paper (or PDF) everyone agrees to trust.

📌 Pro Tip: Most lenders want a matching pair — the SA302 and the Tax Year Overview for the same tax year — so download them together and keep them as one “set” per year (it avoids the classic back-and-forth of “we’ve got your SA302… now we need the overview”).

SA302 vs Tax Year Overview: What’s the difference?

These two documents often get requested as a pair, which makes it sound like they’re basically the same thing. They’re not. Think of them as two sides of the same story: one shows how your tax was calculated, and the other shows what HMRC has on record for that year.

• SA302 (tax calculation): The detailed breakdown of your personal tax for the year — your income totals, tax allowances, and how HMRC worked out the final bill.
• Tax Year Overview: The “account view” — what the bill was, what’s been paid, and whether there’s a balance due or repayment.
• Why lenders want both: It lets them cross-check the calculation against HMRC’s record, which is why they’re commonly requested for a mortgage application or business loan.

📌 Pro Tip: If a lender asks for “the last 2–3 years,” download the SA302 + Tax Year Overview for consecutive years on the same day from your HMRC account — that way they’re generated in the same format and you avoid the annoying “these don’t look consistent” pushback that sometimes happens when documents are pulled at different times or from different sources.

How to download your SA302 from HMRC’s online services

If you filed your Self Assessment through HMRC’s online services, you can usually pull your SA302 tax calculation straight from your HMRC online account on GOV.UK — it’s just slightly hidden in the menus (because of course it is).

• Sign in to your HMRC account using your Government Gateway details on GOV.UK.
• Go to Self Assessment → More details about your Self Assessment returns and payments.
• Under Previously filed returns, choose the relevant tax year and select Get your SA302 tax calculation (sometimes shown as “tax calculation form” or similar wording).
• Open the calculation and select View/print your full calculation, then save as PDF for your records or for information purposes (mortgage/loan checks, etc.).
• Check the document shows your name, UTR, National Insurance number, and the tax year — lenders often reject it if any of those are missing.
• If you’ve just submitted your return, note you can’t print the SA302 until about 72 hours after filing via HMRC online services.

📌 Pro Tip: If the SA302 screen shows a “short” summary, always download the full calculation PDF — some lenders reject the summary version because it doesn’t show the full tax computation detail.

How to download your Tax Year Overview (TYO)

The Tax Year Overview is the companion document to your SA302. Where the SA302 shows the tax calculation, the TYO shows what HMRC has on record for that year: the charge, payments, and any balance.

• In your HMRC online account, go to Self Assessment.
• Select Tax Year Overview and choose the same tax year as your SA302.
• Click Print this page (or your browser’s print option) and save as PDF.
• Check it shows the tax charge and the payments/balance for that year — lenders often want the pair so they can cross-check the figures.

📌 Pro Tip: Some lenders are picky about formatting, so save the TYO as a clean PDF (not a screenshot) and keep the file name consistent with your SA302 (e.g., 2024-25_SA302.pdf + 2024-25_TaxYearOverview.pdf). It makes underwriting faster and prevents “can you resend it?” emails.

Using accounting software and third-party submissions

If you didn’t file directly through HMRC’s online services, don’t panic — you can still get what lenders want, regardless of your chosen tax return options. You just pull the documents from slightly different places.

• If you filed via accounting software: You can usually print the software’s SA302-style tax calculation (the tax computation) and pair it with the HMRC Tax Year Overview from your HMRC account. Many mortgage providers accept this combination because the Overview confirms HMRC’s record for the year.
• If you filed on paper: HMRC will send your tax calculation by post once your return is processed, and you may need to contact HMRC if you need copies for a lender. Paper returns take longer to process, so build in extra breathing room before any mortgage or loan application.”
• If the numbers look “off”: It’s often just processing lag. The lender’s main concern is that the amount of tax and year totals reconcile between the tax calculation and the HMRC overview, and that the correct year is shown.

📌 Pro Tip: If you’re sending software-generated calculations to a lender, export the full computation (not a condensed summary) and keep the matching HMRC Tax Year Overview alongside it — underwriters want the detail and the HMRC “receipt.”

What mortgage lenders usually ask for (and why)

Lenders use SA302s and Tax Year Overviews because they’re the cleanest way to confirm what you reported and what HMRC processed for each tax year — and they like their evidence boring, consistent, and hard to argue with. Lenders typically:

• Ask for 1–3 years of SA302s plus matching Tax Year Overviews because they want a year-by-year trail of income and the corresponding HMRC record (how many years depends on the lender and how “straightforward” your case looks).
• Focus on sustainable profits for freelancers and self-employed applicants because they’re trying to assess affordability on income that’s repeatable, not a one-off spike or a fluke year.
• Ask limited company directors for SA302s/TYOs plus company accounts because your personal return may show a blend of PAYE salary and dividends, while the accounts help them sanity-check the business side of the story.
• Request extra PAYE evidence when you also have a payroll salary (like recent payslips and a P60) because it gives them a current, easy-to-verify snapshot alongside the annual tax-year documents.
• Apply strict document standards across the board because they’re regulated by bodies like the Financial Conduct Authority and have to evidence their affordability checks, so “close enough” paperwork tends to get bounced.

📌 Pro Tip: Before you send anything, ask your broker/lender exactly which income figure they’ll use (latest year, two-year average, or lowest year). It changes what supporting docs matter most — and stops you over-prepping the wrong story.

Troubleshooting: Access, mismatches, and dead ends

When SA302s go missing or the numbers look “off,” it’s usually not a tax mystery — it’s an admin one: the return hasn’t fully processed, you’re in the wrong place/account, or you’re comparing figures that aren’t meant to match line-for-line.

• SA302 not showing up: Make sure the return is submitted (not a draft), you’ve selected the correct tax year, and you’re in the right Self Assessment account for your UTR; if you filed a paper tax return, it may simply not be processed yet.
• Tax Year Overview missing: Check you’re in Self Assessment (not PAYE), and that HMRC has actually processed that year’s return; newly filed returns can take time to appear.
• SA302 and Tax Overview don’t match: Check for amendments to the return, and don’t compare a calculation figure with an account figure that’s been affected by payments on account; once processing is complete, the year’s tax liability should tie up.
• Filed via accounting software: Download the full software tax calculation and pair it with the HMRC Tax Year Overview for the same year — many lenders accept this while HMRC screens catch up.
• Still stuck: Use HMRC’s online help routes first (inside your account where possible) and have your name, address, UTR, and National Insurance number ready so they can locate the right record quickly.

📌 Pro Tip: If you’re under time pressure, ask the lender exactly what they’ll accept temporarily (for example, a software tax calculation + HMRC Tax Year Overview) while HMRC finishes processing — it can keep your application moving instead of paused on one missing PDF.

What to include with your application pack (quick checklist)

Think of this as your “no back-and-forth, please” bundle. The goal is simple: give the lender everything they need to confirm your income and your tax position without coming back with seventeen follow-up emails.

• SA302 (PDF) for each required year (usually 1–3 years, depending on the lender).
• Tax Year Overview (TYO) for each matching year, from the same HMRC tax account.
• Self Assessment context if needed: A short note for anything unusual (big year-to-year swings, an amended return, or a one-off event that affects the tax bill).
• If you have PAYE income as well: Recent payslips and a P60.
• If you’re a limited company director: The company accounts (and sometimes accountant’s reference) to support salary/dividend income.
• Broker cover note (optional but useful): If there are anomalies, your broker can summarise them clearly so underwriting doesn’t make up its own story.
• If something’s missing: Sort it before submission — if you need to contact HMRC, you’ll want your identifiers to hand and (for directors) be clear on your personal address vs any company registered office details.

📌 Pro Tip: Save and name files in clean pairs by year (e.g., 2023-24_SA302.pdf + 2023-24_TYO.pdf). Underwriters love clarity, and this tiny bit of admin can speed up a decision more than any heartfelt cover letter ever will.

Make your application strong

Your SA302 and Tax Year Overview are the core HMRC proofs most lenders lean on. Pull them early, keep each year paired up, and add any supporting documents (software calculations, accounts, notes on variations) so your application reads cleanly first time.

If you’d like a sanity-check before you submit, book a free call through Unbiased. A qualified adviser can tell you exactly what to gather, what lenders usually care about most, and how to present your numbers so underwriting doesn’t get… imaginative.

Frequently Asked Questions (FAQ)