Full-doc vs alt-doc vs low-doc for off-the-plan

Key Takeaway

This article explains how to choose between full-doc, alt-doc and low-doc loans when buying an off-the-plan apartment, emphasising that lenders usually reassess income 18–36 months later at settlement and typically add a 3% serviceability buffer. It outlines documentation requirements, common lender policies, and practical steps for self-employed borrowers. A key insight is to lock in a documentation pathway early and keep a full-doc option open to avoid valuation or policy shocks derailing the purchase.

When buying off-the-plan, full-doc is almost always the safest option, alt-doc is the main backup for self-employed borrowers, and true low-doc is now niche and risky. Your key decision is how you’ll prove income at settlement, usually 18–36 months after you sign the contract, not what you could scrape together today.

Quick answer you can act on this week:

If you can qualify full-doc with some work, do it.
If you’re self-employed with messy books, build toward full-doc while keeping alt-doc as a plan B.
Treat low-doc as last resort only, with eyes open to higher rates and lower LVRs.

Diagram comparing full-doc, alt-doc and low-doc paths to an off-the-plan apartment. Choosing the right documentation path early helps you reach off-the-plan settlement safely.

What “full-doc”, “alt-doc” and “low-doc” actually mean

Full-doc (standard lending):

2 most recent payslips and maybe a group certificate; or
For self-employed: usually 2 years of tax returns and financials, sometimes 1 year if strong.
Lenders apply an APRA-style 3% interest rate buffer to test serviceability.

Alt-doc (alternative documentation):

Used mainly by self-employed borrowers.
Evidence can be: 6–12 months BAS, 6–12 months business bank statements, or an accountant’s letter.
Higher rates than sharp full-doc, and often lower maximum LVR (e.g. 80% instead of 90–95%).

Low-doc (limited documentation):

True low-doc is now rare and usually only via non-banks.
Very limited income evidence, often a self-declaration plus some supporting docs.
Usually lower LVR caps (sometimes 60–70%) and noticeably higher rates and fees.

If your income is complex, have a look at how we build a “bankable” self-employed story in /insights/self-employed-rose-bay-chaotic-accounts-into-bankable-story.

How off-the-plan timing changes the game

With off-the-plan, you usually pay a 10% deposit now and settle in 18–36 months.

The catch: your lender will reassess you at settlement.

That means:

A full-doc pre-approval today doesn’t guarantee full-doc approval at settlement.
Alt-doc may be easier now but harder later if policies change.
A valuation shortfall plus stricter documentation rules can create a painful funding gap.

Off-the-plan buyers should also hold a separate settlement risk buffer for valuation or policy shocks, on top of personal and (if relevant) business buffers (see fact 7 in the knowledge list).

Worked example

Contract price: $900,000
Deposit now: 10% = $90,000
Planned loan at settlement: $810,000 (90% LVR)

If, at settlement:

The lender’s valuation comes in at $850,000; and
Policy has tightened so your income only works on an 80% LVR alt-doc loan,

You may be limited to 80% of $850,000 = $680,000.

You’d then need $170,000 extra (on top of your $90,000 deposit) to settle. Planning your documentation path properly is how you reduce the odds of that scenario.

Frequently asked questions

Yes, many self-employed buyers use alt-doc loans for off-the-plan purchases by relying on BAS, business bank statements or an accountant’s letter instead of full tax returns. However, you’ll still be reassessed at settlement and policies can change, so it’s smart to build towards full-doc as a backup and to keep extra buffers in case valuations come in low.

True low-doc loans are now niche and mostly offered by non-bank lenders, often with higher rates, more fees and lower maximum LVRs. They can sometimes work if you have a large deposit and a clear exit plan to refinance to full-doc later, but they should generally be treated as a last resort rather than a default pathway.

No. A pre-approval reflects the lender’s view at a point in time and is always subject to full assessment at settlement, including updated income checks and valuation. You can sometimes change from alt-doc to full-doc or vice versa, but any change will be assessed against the lender’s policies and interest rates that apply at the time of settlement, not when you first applied.

Choosing Full-Doc, Alt-Doc or Low-Doc For Off-the-Plan Loans