SA302 & Mortgage Applications · 2026
The SA302 Problem: Why CIS Subcontractors Get Rejected for Mortgages Despite Good Income
You earn well, you pay your taxes, you have years of CIS work behind you. Then a mortgage lender looks at your SA302 and offers you a fraction of what you expected — or rejects you outright. Here's why it happens and what you can do about it.
Ever been told you "don't earn enough" for a mortgage — when you know your bank account says otherwise? The problem isn't your income. It's a single HMRC document called the SA302, and the way most lenders read it almost guarantees CIS subcontractors get a worse deal than they deserve.
What the SA302 Actually Shows — and Why It Works Against You
The SA302 is HMRC's tax calculation — a summary of your income and the tax you owe for a given year. For employed people, income verification is straightforward: salary in, tax out, clear number for the lender. For CIS subcontractors, the SA302 tells a very different story.
Here's the problem: the SA302 shows your net profit — gross earnings minus all allowable business expenses. That's the correct figure for calculating your tax. But it's also the figure most mortgage lenders grab for their affordability calculation.
Think about what that means in practice. You earn £45,000 gross and legitimately claim £12,000 in business expenses — tools, mileage at 55p per mile, PPE, insurance, accountancy fees. Your SA302 shows net profit of £33,000. At a standard 4.5× income multiple, the lender offers you a maximum of £148,500 instead of £202,500. That's a £54,000 gap — not because you earn less, but because you run your business correctly.
The cruelty of the SA302 problem is that it penalises subcontractors for doing the right thing. The more accurately you claim expenses and file returns, the worse you look to a standard mortgage lender.
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Most high street lenders follow a simple formula for self-employed applicants: request two or three years of SA302s, take the net profit, average the figures if they vary, and apply their income multiple. That process was designed for sole trader professionals — accountants, consultants — whose expenses are relatively small compared to income. It was never built for CIS subcontractors, where the gap between gross earnings and declared profit is structurally much wider.
1. Net profit is artificially low. Heavy but legitimate expense claims — tools, vehicle costs, PPE — reduce the profit figure lenders use for affordability. You're penalised for running your business properly.
2. Year-to-year variation hurts your average. A quieter year followed by a strong one creates an averaged figure that understates your current earning capacity. Lenders rarely weight the most recent year more heavily.
3. CIS deductions get misunderstood. Some lenders don't recognise that CIS deductions are advance tax payments — not additional costs. They misread the SA302 and assume your actual income is even lower than the net profit figure.
The Numbers Tell the Real Story
How much difference does the SA302 problem actually make? Here's a side-by-side comparison for a subcontractor earning £45,000 gross with £12,000 in legitimate expenses:
| Scenario | Income Used | Max Mortgage (4.5×) |
|---|---|---|
| Standard lender using SA302 net profit | £33,000 | £148,500 |
| Specialist lender using gross CIS earnings | £45,000 | £202,500 |
| Difference in borrowing capacity | £54,000 |
That £54,000 gap can be the difference between buying in your target area and being told to look elsewhere entirely. It's also the difference between getting on the housing ladder and walking out of a lender's office feeling like you don't earn enough — despite earning well above the national average.
High Street Lender vs Specialist Broker: What Changes?
If you've only ever walked into a high street bank, you may not realise how different the experience is with a specialist self-employed mortgage broker. Here's what actually changes:
- Uses SA302 net profit only
- Averages 2–3 years (penalises variable income)
- May not understand CIS deductions
- Limited panel of products
- Often rejects or lowballs CIS applicants
- Can match you to lenders using gross CIS earnings
- Understands CIS deduction statements
- Knows which lenders weight recent years more
- Access to the full lending market
- Presents your income in the strongest light
Five Steps to Fix the SA302 Problem Before You Apply
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Find a Specialist Self-Employed Mortgage Broker This is the single most impactful step you can take. A specialist broker knows which lenders currently accept gross CIS earnings from deduction statements rather than SA302 net profit. The high street bank you walked into doesn't offer this option. A specialist works with the whole market and can match you to the right lender for your specific income structure.
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Gather 12 Months of CIS Deduction Statements Your CIS monthly deduction statements show gross earnings before expenses — and some lenders will accept these as supplementary income evidence. Bring 12 months of statements to demonstrate consistent gross earnings. Combined with your SA302, this gives a lender the complete picture rather than just the net profit headline.
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Plan the Timing of Your Application Most lenders average two or three years of SA302 figures. If your most recent year was significantly stronger than the previous two, waiting until you have two or three strong years on record will materially improve your application. File your Self Assessment as early as possible — from April — so the most recent SA302 is available when you apply.
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Weigh the Expense Trade-Off Carefully This is a genuine dilemma. Claiming every legitimate expense is correct tax planning, but it reduces the net profit figure lenders see. Some subcontractors choose to reduce discretionary expense claims in the year or two before applying — accepting a higher tax bill in exchange for higher declared income. This is a legal choice, but it should be made consciously and with your accountant's input, not as a last-minute panic measure.
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Check Your SA302 Before Any Application Errors on a Self Assessment return — a missed expense, an incorrect income figure, a CIS deduction that wasn't properly credited — will show up on your SA302 and potentially affect a lender's affordability assessment. Pull your SA302 from Government Gateway before you approach any lender and check it against your actual CIS statements and expense records. Amend it if anything is wrong.
Your Government Gateway account produces both an SA302 (tax calculation) and a Tax Year Overview (confirmation of what was filed and paid). Some lenders require both documents together. The Tax Year Overview confirms your SA302 is genuine and matches HMRC's records. Always download both for each year and bring both to any mortgage meeting — not just the SA302.
For a broader look at how CIS tax efficiency affects mortgage eligibility — including gross vs net income strategies and specialist lender options — see: The CIS Mortgage Trap: How Tax Efficiency Can Cost You Your Home
Frequently Asked Questions
Why do mortgage lenders reject CIS subcontractors?
Most mortgage lenders base their affordability calculation on the net profit figure shown on the SA302 — not gross CIS earnings. For a subcontractor earning £45,000 gross but claiming £12,000 in legitimate expenses, the SA302 shows £33,000 net profit. Lenders then offer a mortgage based on £33,000, not £45,000, which significantly reduces borrowing capacity and can lead to rejection if the required loan amount exceeds what that lower figure supports.
What is an SA302 and why do mortgage lenders need it?
An SA302 is HMRC's tax calculation document — a summary of your income and tax liability for a given tax year, produced when you file your Self Assessment. Mortgage lenders use it as proof of income for self-employed applicants including CIS subcontractors, because it's an official HMRC document that confirms what you declared. Most lenders require two or three years of SA302s, which you can download from your Government Gateway account.
How can CIS subcontractors improve their mortgage chances?
The most effective steps are: using a specialist self-employed mortgage broker who knows which lenders accept gross CIS earnings; providing CIS deduction statements alongside SA302s to demonstrate gross income; ensuring two to three years of clean, filed Self Assessment returns are available; and timing your application so your most recent and strongest years are on record. Some subcontractors also choose to reduce expense claims in the year before applying — accepting a higher tax bill to show higher net profit — but this is a trade-off that should be discussed with an accountant.
Which lenders accept gross CIS income for mortgage applications?
Some specialist and certain high street lenders will consider gross CIS earnings rather than net profit — particularly if you can show consistent CIS deduction statements. The list of flexible lenders changes regularly, which is why a specialist self-employed mortgage broker is the most reliable route. A broker works across the whole market and will know which lenders are currently most accommodating for CIS applicants.
People Also Ask
Why does my SA302 show less income than I actually earned?
Your SA302 shows net profit — your gross earnings minus allowable business expenses. If you claimed legitimate expenses for tools, mileage, PPE, insurance, and other business costs, your net profit will be significantly lower than your gross CIS earnings. This is correct for tax purposes but creates a problem with mortgage lenders who use the net profit figure for affordability calculations.
Can I get a mortgage as a CIS subcontractor?
Yes — CIS subcontractors can and do get mortgages. The key is working with a specialist self-employed mortgage broker who knows which lenders are flexible with CIS income. Some lenders will use gross CIS earnings from deduction statements rather than SA302 net profit. You'll typically need two to three years of filed Self Assessment returns and CIS deduction statements.
How do I get my SA302 from HMRC?
Log into your Government Gateway account at gov.uk, go to Self Assessment, and select "View your SA302 and tax year overviews." You can download SA302 documents for the past four tax years. Download both the SA302 and the Tax Year Overview for each year — most mortgage lenders require both documents together as proof of income.
The Right Lender Makes All the Difference
The SA302 problem isn't a reflection of your income or your creditworthiness — it's a mismatch between how HMRC calculates tax and how most mortgage lenders calculate affordability. The fix isn't to stop claiming expenses or to underpay tax. It's to find the lender who actually understands how CIS income works.
Get your SA302 and Tax Year Overview documents in order. Find a specialist self-employed broker. Provide your CIS deduction statements as supplementary evidence. And if you have time before you need to apply, make sure you have two or three strong years of returns on record. The mortgage you deserve is out there — but you need the right path to reach it.
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Know Your CIS Numbers Before You Apply.
Check what HMRC has already deducted from your CIS invoices — and make sure your invoicing record is complete and consistent before any mortgage application.
This article is for informational purposes only and does not constitute formal mortgage, financial, or tax advice. Mortgage lending criteria change regularly and vary significantly between lenders. Always consult a qualified mortgage broker and accountant before making decisions about your mortgage application or tax return. Aligned to 2026/27 HMRC guidance.