Refinancing Your Investment Portfolio: A Step-by-Step Strategy
- Portfolio refinancing — reviewing and potentially refinancing multiple investment loans simultaneously — should be treated as a strategic exercise, not a rate-chasing exercise
- Lender diversification across your portfolio improves flexibility — having all properties with one lender creates concentration risk and limits your negotiating position
- Interest-only periods, offset account structures, and loan splits require careful coordination across a portfolio to avoid tax contamination and maximise deductibility
- The APRA DTI cap (debt-to-income ratio above 6x) affects investors with larger portfolios — some lenders have more remaining exception capacity than others
- Staggering fixed rate terms across properties prevents a "cliff effect" where all fixed terms expire simultaneously
- Cross-collateralisation — using multiple properties as security for a single loan — reduces flexibility and should generally be avoided in portfolio structures
Why Portfolio Refinancing Is Different
Refinancing a single owner-occupied home is relatively straightforward — you compare rates, calculate the break-even, and make a decision. Refinancing an investment portfolio introduces additional complexity because each loan interacts with the others in terms of serviceability, tax structure, and lender relationships.
Investors who approach portfolio refinancing as multiple individual decisions in isolation often miss the strategic opportunities and create structural problems that take years to untangle.
Step 1: Complete a Portfolio Audit Before Doing Anything
Before approaching any lender, complete a full audit of your current portfolio position.
For each property, document:
- Current lender and loan product
- Outstanding loan balance
- Current interest rate (variable) or fixed rate and expiry date
- Loan type (P&I or interest-only) and remaining IO period if applicable
- Estimated current property value (check recent comparable sales)
- Calculated current LVR (loan balance / estimated property value)
- Annual rental income
- Annual holding costs (interest, management, rates, insurance, maintenance)
- Net rental position (positive or negative cash flow after tax benefit)
This audit gives you a clear picture of where each loan stands relative to current market rates and your current LVR tier — which determines what rates you can realistically achieve through refinancing.
Step 2: Identify Which Loans Are Worth Refinancing
Not every loan in your portfolio will benefit from refinancing. Apply the break-even filter to each one separately.
Priority candidates for refinancing:
- Loans where your rate is more than 0.4-0.5% above current market rate for your LVR tier
- Loans on products that no longer suit your needs (for example, no offset account on an investment loan you now want to use for tax structuring purposes)
- Loans where your LVR has improved significantly (property appreciation may qualify you for a better rate tier)
- Loans where the IO period is expiring and you want to extend it or restructure
Lower priority or not worth refinancing:
- Loans with significant break costs on fixed rates
- Loans with small balances where the saving is minimal
- Loans in the final years of repayment
Step 3: Review Your Loan Structure for Tax Efficiency
Portfolio refinancing is an opportunity to fix structural problems that affect your tax position. Common issues to address:
Mixed-purpose contamination: If any investment loan has been redrawn for personal purposes, the loan is partially contaminated and only a portion of the interest is deductible. Refinancing does not fix contamination — the ATO's position is that the purpose of funds at the time of each drawdown determines deductibility. But refinancing does allow you to start fresh with a clean loan for the investment portion, keeping careful records from that point forward.
Cross-collateralisation: If a lender holds multiple properties as combined security, refinancing individual properties becomes complicated. Portfolio refinancing is an opportunity to uncross collateral and establish standalone loans for each property.
Offset account placement: For investors who also have a home loan, savings should sit in an offset account linked to the home loan (non-deductible debt), not the investment loan (deductible debt). Portfolio refinancing is an opportunity to review and correct this structure.
Interest-only periods: IO periods on investment loans are typically 5 years (up to 10 years with some lenders). Investors approaching the end of an IO period have three choices: extend the IO period at the same lender (requires a serviceability reassessment), refinance to a new lender and reset the IO period, or allow the loan to revert to P&I. Portfolio refinancing allows you to coordinate IO period expiries so they do not all fall due simultaneously.
Step 4: Consider Lender Diversification
Having all your investment loans with a single lender creates concentration risk and reduces your negotiating power. When you want to refinance, buy another property, or access equity, the lender holds all the cards.
Spreading loans across 2-3 lenders has several advantages:
- Each lender only has visibility of the loans with them
- If one lender tightens their investment lending policy, your options are not entirely dependent on that lender's decision
- You maintain competitive tension — one lender's retention offer can be compared against another's new customer rate
Step 5: Address the DTI Cap for Larger Portfolios
From February 2026, APRA's debt-to-income cap requires lenders to keep more than 80% of new loans below a DTI of 6x gross annual income. Investors with multiple properties are most likely to be affected.
If your total debt across all properties (plus your owner-occupied loan) exceeds 6x your gross annual income, fewer lenders can approve new applications or refinances — they have only a limited allocation for high-DTI borrowers.
The practical implication for portfolio refinancing: if your DTI is above or approaching 6x, you need a broker who knows which lenders currently have remaining capacity for high-DTI investment borrowers. This allocation is not published and changes monthly. Contact Luke Drake to check your DTI position and identify which lenders can currently accommodate your portfolio.
Step 6: Stagger Fixed Rate Terms
If any loans in your portfolio are on fixed rates, be deliberate about when those terms expire. If all your fixed rates expire simultaneously, you are forced to renegotiate or refinance everything at once — in whatever rate environment exists at that moment.
Staggering fixed rate expiries means:
- You never have more than one or two loans requiring decisions simultaneously
- You have ongoing leverage with lenders (you are always in the market for some portion of your portfolio)
- You are exposed to different points in the rate cycle across your portfolio, which provides a natural hedge
Step 7: Sequence Your Refinancing Carefully
The order in which you refinance matters. Refinancing multiple loans simultaneously creates multiple credit enquiries and may temporarily compress your credit score.
Recommended sequence:
- Start with the loan where the rate saving is largest relative to break-even
- Allow 30-60 days before refinancing the next loan — this spaces out credit enquiries
- Address any loans with structural issues (contamination, cross-collateralisation) next
- Leave loans with break costs until those costs reduce to acceptable levels
Frequently Asked Questions
Do I need to tell my current lender I am considering refinancing other properties?
No. Each refinance application is independent. However, all lenders can see your total debt position through credit bureau records.
Can I refinance investment properties while also applying for a new loan?
Yes, but timing matters. A broker can advise on the optimal sequencing of refinances and new applications to minimise credit file impact.
What is the "cliff effect" in portfolio refinancing?
The cliff effect occurs when multiple fixed rate terms expire at the same time, forcing you to renegotiate or refinance all your loans simultaneously. Staggering fixed rate terms across properties prevents this.
Should I use a specialist investment lender or a major bank for my portfolio?
Both have advantages depending on your portfolio size and income profile. Major banks typically offer more competitive rates for straightforward investor profiles. Specialist lenders and non-bank lenders often have more flexible policies for self-employed borrowers, larger portfolios, or unconventional income structures.
Disclaimer
This article provides general information about investment portfolio refinancing in Australia. It does not constitute financial, tax, or investment advice. Refinancing multiple investment loans involves complex tax, serviceability, and structural considerations. Consult a qualified mortgage broker, tax accountant, and financial adviser before making decisions about your investment portfolio. Contact Luke Drake at Frontier Finance Co for a personalised portfolio review.