Choosing between a low doc and full doc home loan comes down to one question: can you provide complete tax returns that support the amount you need to borrow? If yes, full doc will almost always get you a better rate. If not, low doc exists for exactly that reason - and understanding the trade-offs helps you make the right call.
By Jason Given - August 2026 - 7 min read
Full doc loans require complete tax returns - usually two years - along with financial statements and ATO notices of assessment. This is the standard path for most borrowers. The lender verifies your income directly from official records and assesses your capacity based on declared earnings.
Low doc loans accept alternative documentation instead. BAS statements, business bank statements, and accountant declarations can all be used to verify income. The lender still assesses your ability to repay - they simply accept different evidence.
Full doc generally offers better interest rates and higher loan-to-value ratios. Low doc offers flexibility when full documentation is not available or does not reflect your actual earning capacity. Neither is inherently better - they serve different situations.
Full doc should be your first consideration when you have up-to-date tax returns, when your declared income supports the amount you need to borrow, when you want the lowest possible interest rate, and when you need to borrow above 80% LVR.
Even self-employed borrowers should consider full doc first. The assumption that self-employed means low doc is a common mistake. The right lender can assess self-employed income very favourably using full documentation - add-backs for depreciation, one-off expenses, and director salaries can significantly increase your assessed income without needing to go low doc.
If your accountant has your returns up to date and the numbers work, full doc will save you money on rate and give you more flexibility on LVR.
Low doc becomes the right path when tax returns are not yet lodged or are significantly delayed, when declared taxable income is much lower than actual earning capacity due to depreciation, business reinvestment, or aggressive tax planning, when you need to move quickly and cannot wait for tax returns to be prepared, or when your accountant structures your income in a way that reduces your taxable position well below what you actually earn.
In these situations, forcing a full doc application means either borrowing less than you need or getting declined entirely. Low doc gives you a path forward, and the rate premium is the cost of that flexibility.
Full doc rates are the standard advertised rates you see from lenders. Low doc typically adds a premium of 0.3% to 1.5% depending on the lender, the LVR, and the type of documentation provided.
To put that in real numbers: on a $500,000 loan, the difference between 6% and 7% is roughly $300 per month or $3,600 per year. Over five years before refinancing, that is $18,000 in additional interest. This is the cost of flexibility - and for many borrowers it is worth paying, especially when the alternative is not being able to purchase at all.
Full doc loans can go up to 95% LVR with lenders mortgage insurance (LMI), and 80% without LMI is the standard threshold. This gives borrowers maximum flexibility on deposit size.
Low doc loans are typically capped at 80% LVR, and many lenders restrict to 60% or 70%. If you need a high LVR - because you have a smaller deposit or want to retain cash for other purposes - full doc is usually the only realistic path.
This is one of the most important practical differences. A borrower looking at a $700,000 property with a 10% deposit ($70,000) needs 90% LVR. That rules out almost every low doc product on the market.
Full doc income is assessed from tax returns, using either the average of two years or the most recent year depending on the lender. The lender takes the declared taxable income (with some add-backs) and applies their serviceability calculator.
Low doc income is declared by the borrower and verified against BAS statements or bank statements. The lender checks that the declared income is reasonable given the evidence provided, but they are not bound by what appears on a tax return.
This creates an interesting dynamic. Some borrowers actually have higher borrowing capacity under low doc because their BAS turnover or bank deposits significantly exceed their declared taxable income. If your business turns over $400,000 but your taxable income after deductions is $85,000, a low doc lender assessing against BAS may give you more capacity than a full doc lender assessing against tax returns.
Sometimes the best strategy is not purely low doc or full doc. Some specialist lenders assess self-employed income very favourably using full documentation - applying generous add-backs that dramatically increase assessed income. Others accept partial documentation, such as one year of tax returns combined with BAS statements, rather than requiring the standard two years.
This is where broker access matters. With 60+ lenders on the panel, Lendology evaluates all available options - full doc, low doc, alt doc, and specialist - to find the combination that maximises your borrowing capacity at the best possible rate. The right answer is rarely obvious without comparing across multiple lenders.
If you go low doc now, plan the refinance to full doc from day one. Lodge your tax returns, build the income history your accountant needs to show strong numbers, and then refinance to a full doc product once you have the required documentation in place.
The savings from moving to full doc can be substantial - 0.5% to 1.5% lower on your rate, which on a $500,000 loan means $2,500 to $7,500 per year in reduced interest. Most borrowers can make this transition within 12 to 24 months if they plan ahead.
Lendology builds this transition plan into every low doc application. The goal is never to stay on a low doc rate longer than necessary.
Yes, this is common. Once you have lodged tax returns covering the required period - usually two years - you can refinance to a full doc loan at a lower rate. Many borrowers use low doc as a stepping stone and move to full doc within 12 to 24 months. The savings on rate alone make the refinance worthwhile.
No. Many major banks only offer full doc products. Low doc and alt doc options are more common with non-bank lenders and some second-tier banks. This is one of the key advantages of using a broker - Lendology has access to 60+ lenders including specialists who focus specifically on alternative documentation lending.
It varies. Low doc applications can sometimes be faster because there is less documentation to verify. However, some lenders apply additional scrutiny to low doc applications, which can slow things down. Processing time depends more on the specific lender and their current workload than on the documentation type itself.
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