Low doc loans serve a purpose - they get you approved when full documentation is not available. But they come with a rate premium. Once your circumstances change, refinancing to full doc rates can save you thousands per year. This is not an afterthought - it should be part of the plan from day one.
By Jason Given - August 2026 - 6 min read
A low doc home loan gets you into the market when you cannot provide the standard documentation. That is a genuine benefit. But the trade-off is a higher interest rate - typically 0.5% to 1.5% above what a full doc borrower would pay for the same loan.
On a $600,000 loan, that rate premium can cost you $3,000 to $9,000 per year in additional interest. Over the life of a loan, the difference is significant. The good news is that for most borrowers, the low doc situation is temporary. Once your tax returns are lodged and your income is documented, you become eligible for full doc rates.
The refinance from low doc to full doc is the exit strategy. It should be planned from the moment you take the low doc loan, not discovered years later when you realise you have been paying more than you needed to.
The right time to refinance from low doc to full doc depends on several factors coming together. You are generally ready when:
Most borrowers are ready to refinance 12 to 24 months after taking the low doc loan. The key trigger is having your tax returns lodged and your ATO Notice of Assessment issued. Without these, lenders cannot verify your income through standard channels.
The savings from refinancing to a full doc rate are substantial. Here is a straightforward example:
Even accounting for refinancing costs - typically $1,000 to $3,000 in discharge and new setup fees - the breakeven is usually within a few months. After that, every month on the lower rate is money saved.
The refinance process is smoother when you prepare for it early. There are several things you can do while you are still on your low doc loan to put yourself in the strongest position:
If your business income has grown since you took the low doc loan, the refinance may also increase your borrowing capacity for future needs. Documenting that growth through your tax returns is how you unlock it.
If your tax returns show lower income than expected, the refinance to full doc may not work immediately. This is not uncommon - self-employed income fluctuates, and a weaker year can affect what lenders will approve.
In this case, you have options:
The important thing is not to assume you are stuck. There are usually options - you just need to know where to look.
Beyond having your documentation in order, there are a few other factors worth considering when timing your refinance:
Lendology runs the full comparison - current loan costs versus refinanced position - and tells you exactly when the refinance makes financial sense. Sometimes the answer is now. Sometimes it is worth waiting three months for your next tax return. Either way, you will know the numbers before you decide.
The best approach is to plan the refinance before you take the low doc loan. When Lendology structures a low doc application, the exit strategy is part of the conversation from the beginning.
That means mapping out both stages - the initial low doc approval to get you into the property, and the future refinance to full doc once your documentation catches up. You know the timeline, the expected costs, and the projected savings before you sign anything.
A low doc loan is a tool, not a destination. Used well, with a clear plan for when and how to move to full doc, it serves its purpose without costing you more than it needs to.
There is no mandatory waiting period, but practically you need time to lodge tax returns - usually 12 to 24 months. Some lenders also have clawback periods on broker commissions which may affect timing. Lendology advises on the optimal timing for your specific situation.
Most low doc loans do not have fixed exit fees, but check for discharge fees (typically $300 to $500) and any break costs if you are on a fixed rate. These are usually minor compared to the interest savings from refinancing.
Yes, and this is usually the best approach. The lender that was right for your low doc application may not offer the most competitive full doc rates. Lendology compares across 60+ lenders to find the best full doc rate for your refined position.
Ready to talk?
We will run the comparison, show you the savings, and tell you exactly when the refinance makes sense for your situation.