Should Your Green Square Off‑the‑Plan Loan Be IO or P&I?

For a Green Square off‑the‑plan unit, principal‑and‑interest (P&I) usually suits owner‑occupiers and conservative investors, while interest‑only (IO) can work for investors who prioritise cashflow and understand the higher long‑term interest and repayment jump when IO ends. Your call should be based on post‑settlement cashflow, risk tolerance, and how long you’ll hold the unit.

Here’s how to make a decision this week, without a 2‑hour seminar.

Choosing between principal-and-interest and interest-only shapes how your Green Square loan feels month to month.

1. Quick definitions in a Green Square context

Principal-and-interest (P&I)

You pay interest plus some of the debt each month.

Your balance falls from settlement.

Over 25–30 years you fully repay the loan.

Interest-only (IO)

For 1–10 years (most common: 3–5), you only pay interest.

Your balance does not fall during the IO period.

After IO ends, repayments jump because you must clear the same debt over a shorter remaining term.

For Green Square and Zetland apartments, most lenders still assess your borrowing power as if you’re paying P&I, even if you ask for IO, using a stress rate roughly 3% above the actual rate (per APRA guidance).

2. What changes with off‑the‑plan in Green Square?

Off‑the‑plan in Green Square has three specific moving parts:

1. Long time to settlement (often 18–36 months). Your situation, interest rates and lender rules can all change before you get the keys.

2. Valuation risk at completion. If the market softens or your tower is treated as high‑density, the bank’s valuation may come in low, lifting your effective LVR and shaping what IO options they’ll allow. See /insights/high-density-mixed-use-green-square-lender-rules.

3. Serviceability at the new rate. If rates rise before settlement, the bank still has to re‑check that you can afford the loan on P&I at a stressed rate.

Because of that, your choice is less about getting a bigger loan, and more about how your cashflow looks once you settle.

3. P&I vs IO: the cashflow and risk trade‑off

Worked example (illustrative only)

• Purchase price: $900,000 new unit in Green Square
• Loan: $720,000 (80% LVR)
• Rate (owner‑occupier P&I): 5.9% p.a.
• Rate (investor IO): 6.3% p.a.
• Term: 30 years total; IO period: 5 years

Approximate repayments:

• Owner‑occupier P&I: ~$4,279 per month over 30 years
• Investor IO (first 5 years): ~$3,780 per month
• Investor P&I after IO ends (remaining 25 years): jumps to ~$4,788 per month

So the investor saves about $500 per month during the IO period, but later faces a spike of about $1,000 per month compared with their IO payment.

If you’re tight on cashflow, that IO‑to‑P&I step‑up can be exactly where people get into trouble.