How to Fund a Sea‑Change or Tree‑Change Without Overstretching

Thinking about a sea‑change or tree‑change and wondering if you can safely use your equity to do it? You generally can, if you cap how much equity you release, keep your post‑move repayments under about 30–35% of net income, and avoid being stuck with two large loans for long. The danger is over‑leveraging into a lifestyle move just as rates and living costs rise.

Here’s a decision‑grade guide you can work through this week.

Sea‑change and tree‑change moves can be rewarding if the finance is structured safely.

1. Step 1 This Week: Know How Much Equity You Can Really Use

1.1 What ‘usable equity’ actually means

Your usable equity is not just “current value minus loan”. It’s the portion you can borrow against while keeping your loan‑to‑value ratio (LVR) in safe bands and passing bank serviceability tests.

Indicatively:

• Most lenders: comfortable up to 80% LVR without lenders mortgage insurance (LMI).
• Above 80%: higher scrutiny, LMI cost, or outright decline in a volatile market.
• APRA expects banks to test repayments at least 3% above your actual rate.

Usable equity formula (simple version): 80% of current value – current loan.

Example on a $1.4m city home with a $650k loan:

• 80% of value = $1,120,000
• Less existing loan = $650,000
• Usable equity ≈ $470,000

You should rarely use all of this. Keeping total LVR at or under ~70–75% is often safer, especially with one income or self‑employment.

1.2 Check real serviceability, not just equity

In 2026, living costs and rates are rising (ABS LCIs and RBA statements both show higher mortgage interest costs). Roy Morgan estimates 28.2% of mortgage holders are already ‘At Risk’ of mortgage stress.

That’s why:

1. Model repayments at 3% higher than today’s rate.
2. Keep total housing repayments under ~30–35% of net income.
3. Hold 3–6 months of all expenses and loan repayments in offset as a minimum buffer (12 months if you’re self‑employed or moving to less secure work).

If those tests fail, the move may need a smaller budget or a different structure.

2. Choose Your Structure: Bridging, Sell‑Then‑Buy, or Equity‑First

Your structure matters more than the headline interest rate. It sets your peak debt, cashflow strain and risk if your city home sells late or for less.

2.1 Options at a glance

For a deep dive on bridging structures and ‘peak debt’, see /insights/bridging-loan-vs-sell-then-buy-structuring-finance-safely.

2.2 When a bridging loan fits a regional move

Bridging can work if:

• You have strong, stable income and low existing LVR.
• The city property is highly saleable with realistic pricing.
• You’re comfortable with 6–12 months of potentially doubled debt.

You’ll want:

• Conservative sale price assumptions (recent comparable sales minus a safety margin).
• A firm maximum bridging period (for example, 6 months) and a price at which you’ll cut your losses and accept an offer.

If you already know you’re uncomfortable with big short‑term debt, you may be better using equity to fund a deposit and then selling quickly after.

2.3 Using equity instead of bridging

A common structure is:

1. Refinance your city home and release a capped amount of equity.
2. Use that as deposit and costs for the sea‑change or tree‑change property.
3. Take a separate loan split over the new property for the balance.
4. Decide upfront whether you will:
   • Keep the city home as an investment, or
   • Sell it within a defined window to reduce debt.

This approach was used (with different details) by a Bondi couple upgrading without a formal bridge; see /insights/bondi-upgrade-unit-to-family-home-without-selling-too-soon for how the numbers and buffers were set.