The One Document Behind a One Doc Home Loan
The Doc Behind a One Doc Home Loan | Switchboard Finance
Accommodation Finance
One Doc · Accountant's Letter · BAS
The One Document Behind a One Doc Home Loan
A One Doc home loan is named for a single income document that stands in for two years of tax returns. For a self-employed accommodation operator whose taxable income reads low on paper, that one page is the whole deal. Here is what it has to show, and how a specialist reads each line.
Quick Answer
A One Doc home loan rests on one income document, usually an accountant's letter or a recent BAS, instead of full tax returns. A specialist reads that single page to verify what a self-employed borrower really earns, not the low figure on a return. Here is what it must show.
One document, not a lighter test
One document does not mean less proof; it means the verification that two years of tax returns would normally carry, compressed onto a single page a specialist will accept. For a self-employed borrower that page is usually an accountant's letter from a CPA or CA, a recent BAS, or six months of business bank statements.
A One Doc home loan is a property-secured loan that verifies income from that one page instead of full financials, which is what separates it from a standard bank application and from an alt doc home loan that may lean on more than one document. The one doc home loan glossary entry sets out where it sits against self-employed and low doc lending. The category name is literal: get the single document right, and most of the file follows.
Why a self-employed income picture does not fit bank servicing
A self-employed income picture does not fit bank servicing because the bank reads taxable income, and good tax advice is built to make taxable income small. The bank sees the figure at the bottom of your return; the business behind it can turn over far more. That mismatch is the whole reason the One Doc path exists.
Australia has around 2.7 million actively trading businesses, and roughly 63.6% are non-employing, which is exactly the cohort a One Doc path is built for. ABS, Counts of Australian Businesses, as at 30 June 2025
Specialist lenders work the other way. They read what the business actually earns before the deductions, then restore the add-backs for depreciation and one-off write-downs that good planning creates. Depreciation and the instant asset write-off are ATO settings that lower taxable income without lowering the cash a business generates, which is why a specialist reads them back in. That gap, between the conservative figure your accountant signs off and the capacity a lender will accept, is unpacked in full in why your accountant said no to a One Doc home loan. In practice, the figure that gets assessed sits closer to real earning capacity than the taxable line a bank stops at.
The income document, read line by line
Read line by line, the income document has to show a short list of specific things before a specialist will lend against it. What the lender looks for is a recent accountant's letter signed by a registered CPA or CA, the income figure stated plainly, GST turnover visible on the BAS that sits behind it, and the add-backs explained rather than assumed. The whole point is that the income is verified to policy, not self-certified on trust, so every figure needs to trace back to records the accountant or the BAS already holds.
Will the income document pass a specialist read?
A recent accountant's letter from a registered CPA or CA, with the annual income figure stated plainly and dated close to the application.
GST turnover visible on the BAS sitting behind it, and add-backs for depreciation and one-off write-downs spelled out rather than assumed.
Every figure traceable back to records the accountant or the BAS already holds, so the income is verified to policy.
A letter from someone who is not a registered accountant, or a BAS that is months out of date or not lodged.
An income figure that cannot be traced to anything, add-backs assumed with nothing behind them, or income self-certified on trust rather than to policy.
On the files I package, the difference between a clean approval and a stall is rarely the borrower, it is whether the single income document was prepared to say what the lender needs to read. A letter that names the accountant, states the income, and ties to a recent BAS travels a long way; a vague one-liner does not.
What sits alongside the one document
Alongside the one document, a One Doc home loan still needs a deposit, clean-enough credit, and a way out. The usual starting point is around a 20 percent deposit or usable equity, varies by lender, because that is where the widest specialist panel opens up. Below that the panel narrows, and the conversation often shifts to private lending or a different structure.
Most borrowers also map a clear exit strategy from the start, a plan to refinance to a sharper rate within around 1 to 3 years once tax returns are lodged and the file reads cleanly. For a self-employed operator buying or refinancing a home while running a going concern, the single income document is the one piece that ties the personal loan to the business reality, and it sits inside the wider accommodation finance picture. In practice, a specialist would rather see a smaller, well-documented income figure with a real exit than a big number no one can verify to policy.
A One Doc home loan turns on the single income document, usually an accountant's letter from a CPA or CA or a recent BAS, because a self-employed borrower's taxable income is built to look small. The specialist reads that one page for real earning capacity, restoring the add-backs for depreciation and one-off write-downs, and checks that every figure is verified to policy, not self-certified on trust. Get the document right, pair it with around a 20 percent deposit or usable equity, varies by lender, and a clear exit, and the rest of the file follows.
Key takeaway: prepare the one income document to say exactly what a specialist needs to verify, and the One Doc path opens up.Frequently Asked Questions
The documents you need for a One Doc home loan come down to one primary income document, usually an accountant's letter or a recent BAS, plus the usual identity, deposit and property paperwork. The single income document does the heavy lifting that two years of tax returns would normally do, which is why the category is called One Doc. You can see what that core document covers in the accountant's letter glossary entry.
The one document in a One Doc home loan is the single piece of income evidence a specialist lender accepts in place of full financials, most often an accountant's letter from a CPA or CA, a recent BAS, or business bank statements. It has to show what the business actually earns, not just what was reported as taxable income. The one doc home loan glossary entry sets out how it sits against alt doc and low doc lending.
A One Doc home loan needs either an accountant's letter or a BAS in most cases, and having both available widens the lender options rather than narrowing them. Some lenders read GST turnover visible on the BAS, others want an accountant to confirm the income figure, and a few accept business bank statements instead. A broker maps your self-employed home loan file to whichever lender suits the document you actually hold.
Your taxable income looks too low to a bank because good tax advice minimises it through add-backs for depreciation and one-off write-downs, while a One Doc lender reads the income before those deductions. A specialist verifies real earning capacity from the accountant's letter or BAS, not the bottom line on your return. That gap is unpacked in full in why your accountant said no to a One Doc home loan.
The deposit you need for a One Doc home loan is usually around a 20 percent deposit or usable equity, varies by lender, because that is where the widest specialist panel opens up. Below that, the panel narrows and the conversation often shifts to private lending or a different structure. Rates and terms also improve as the deposit grows, alongside a clear exit strategy to refinance once the file is cleaner.
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