Refinancing from Low‑Doc to Full‑Doc: The Safer Upgrade Playbook

Refinancing from low‑doc to full‑doc becomes realistic once your business income is stable, your financials are clean enough for verification, and your equity is usually at or above 20% so you can avoid new LMI. For most self‑employed borrowers, that means at least one to two years of lodged returns that show sufficient taxable income, plus a careful serviceability check using a 3% APRA buffer.

This guide gives you decision‑grade detail on timing, traps and tactics so you can decide this week whether to refinance now or build towards it.

Most low‑doc to full‑doc refinances complete within 4–8 weeks once your paperwork is ready.

1. Why upgrade from low‑doc to full‑doc at all?

1.1 What you gain by moving to full‑doc

Full‑doc loans usually mean:

• Sharper interest rates and fees than low‑doc or alt‑doc
• More lenders to choose from and better product features
• Easier future refinances and top‑ups

On a $800,000 loan, even a 0.75% p.a. rate difference can mean material savings.

Worked example (illustrative only):

• Loan: $800,000, 30 years, P&I
• Low‑doc rate: 7.0% p.a. → repayment ≈ $5,320 per month
• Full‑doc rate: 6.25% p.a. → repayment ≈ $4,930 per month
• Approximate saving: $390 per month, or $4,680 per year

Over three to five years, this easily offsets reasonable refinance costs if you structure it well.

1.2 When sticking with low‑doc may be safer (for now)

You may delay upgrading if:

• Your ABN is new (<2 years) or income is still lumpy
• You’ve heavily minimised taxable income in your latest returns
• You have unpaid or under‑arranged ATO debt

In these cases, you might instead plan a 12–24 month path to full‑doc. See the cluster guide on future‑proofing your numbers: From Startup Books to Bank‑Ready.

2. Timeline: how long does the refinance really take?

Most low‑doc to full‑doc refinances take 4–8 weeks once you’re actually ready. The slow part is often tax returns and documents, not the bank.

2.1 Typical refinance timeline

If your tax returns aren’t lodged yet, build that into the plan. For timing trade‑offs between tax and borrowing power, see /insights/timing-tax-returns-self-employed-mascot-home-buyers.

2.2 One‑week ‘am I ready?’ action plan

In a single focused week you can:

1. Pull last two years’ tax returns and ATO Notices of Assessment.
2. Export 6–12 months of business and personal bank statements.
3. Check your current loan balance, rate and features.
4. Get a broker to run a pre‑assessment using full‑doc calculators.

The goal is not to apply yet. It’s to see if serviceability and equity stack up, or if you need another year of cleaner numbers first.

3. Serviceability for full‑doc: what lenders actually look at

3.1 Income evidence and how it’s assessed

For self‑employed borrowers, most full‑doc lenders want:

• 2 years of personal and business tax returns and financials, or
• Sometimes the latest 1 year, if it’s clearly stronger and stable

They test serviceability using:

1. Your average (or lower of) last two years’ taxable income.
2. Add‑backs like non‑cash depreciation or legitimate one‑offs.
3. A 3% interest rate buffer on top of your actual rate (as guided by APRA).

If your last return is much lower because of aggressive tax planning, your borrowing power can fall sharply. That’s why aligning accountant and broker is critical; see /insights/smart-tax-planning-before-australian-home-loan-1-3-years.

3.2 Practical serviceability sense‑check

Before you fall in love with a lower rate, check:

• Could you afford repayments if rates were 3% higher than today?
• Would you still have at least 6–12 months of total costs in cash or offset after settlement (a sensible range for self‑employed clients, consistent with our broader buffer guidance)?

If the answer to either is ‘no’, a full‑doc refinance might technically ‘fit’ but be too tight in real life.