Refinancing an Interest-Only Investment Loan Before the Term Ends

Key Takeaways

• On a hypothetical $600,000 loan at 6.5%, moving from interest-only to principal and interest over the remaining 25 years lifts repayments by about $801 a month with no rate rise.
• Refinancing an interest-only investment loan typically requires a fresh lending assessment. Another interest-only period does not automatically continue from the existing loan.
• The main paths are a new-lender refinance, an approved change with the current lender or the scheduled move to principal and interest.
• Current serviceability, property value, existing debts and borrower structure can affect which options are available before expiry.

An interest-only investment loan can create a sharp cash-flow change when the interest-only period ends, even if the interest rate does not move. Principal repayments begin, and the outstanding balance must generally be repaid over the years left on the loan.

Refinancing an interest-only investment loan before that date is a structure decision, not simply a rate review. The investor needs to compare the scheduled repayment under the existing loan with any alternative that can be approved.

A refinancing mortgage broker can assess the loan before expiry against the investor’s current financial position and proposed structure. The relevant comparison is between options available now, not the structure approved several years ago.

Keeping interest-only repayments is not automatically the stronger outcome. Principal and interest may suit an investor who wants debt to reduce, while another investor may place more weight on cash flow or portfolio flexibility. The decision depends on what can be approved and how each structure affects repayments, loan term and total interest.

What Happens When an Interest-Only Period Ends?

When an interest-only period ends, the loan will generally start requiring principal and interest repayments under its existing terms. Several parts of the loan determine how large that change may be:

Principal Repayments After Expiry

Principal repayments begin because the agreed period of interest-only minimum repayments has finished. Each scheduled repayment then covers interest and part of the outstanding principal.

The loan balance may still be close to its starting amount where the borrower made no voluntary principal reductions during the interest-only period. Once principal repayments begin, that balance typically needs to amortise across the remaining loan term.

For an investor who has budgeted around an interest-only repayment, the material change is the repayment method itself, not only the interest rate.

Loan Term Left After Expiry

An interest-only period usually forms part of the overall loan term and does not pause it.

Consider a hypothetical $600,000 investment loan with a 30-year term and an initial five-year interest-only period. After those five years, 25 years remain under the original 30-year term.

Assume the balance is still $600,000 and the rate remains 6.5% purely for illustration. Interest-only repayments at that rate are about $3,250 a month. Using standard monthly principal and interest amortisation over the remaining 25 years gives an estimated repayment of about $4,051 a month.

That is an increase of about $801 a month with no assumed rate rise. The figures are illustrative only. Actual repayments depend on the balance, rate, remaining term, repayment frequency, fees and lender calculations.

Fixed-Rate Expiry on a Separate Date

A fixed-rate period and an interest-only period are separate loan features and may have different expiry dates.

An investor could still have time remaining on a fixed-rate period when the interest-only period ends.

Both dates should be checked before comparing options. The interest-only expiry determines when the repayment method is due to change, while the fixed-rate expiry determines when that pricing period ends.

Why Review the Loan Before the Interest-Only Period Ends?

Reviewing the loan before expiry gives the investor time to test current borrowing options before the scheduled repayment change takes effect. The timing matters for several separate reasons:

Repayment-Reset Lead Time

Starting before the reset leaves time to confirm the expiry date, calculate the scheduled principal and interest repayment, prepare documents and test whether the requested structure may be available.

There is no universal lead time for every refinance. A borrower with one property and straightforward income may require less preparation than a self-employed investor with several loans held through different entities.

The aim is to allow enough time to compare a proposed alternative with the scheduled position under the existing contract.

Fresh Credit Assessment

A refinance typically requires a new assessment because the proposed lender is deciding whether to approve the debt under the borrower’s current circumstances and its current lending criteria.

For consumer credit covered by Australia’s responsible lending regime, credit licensees must make reasonable inquiries about the consumer’s financial situation and take reasonable steps to verify it before assessing whether the proposed credit contract is unsuitable.

The original lender’s decision does not establish that a new lender will approve the same structure years later.

Pre-Expiry Loan Comparison

The comparison needs to separate the interest rate, repayment type, loan term and switching costs so the investor can see what is producing any change in repayments.

A refinance might reduce the monthly amount because the rate is lower, another interest-only period is approved, the loan term is extended or several factors apply together.

Each change has a different effect. A lower rate may reduce interest cost. Another interest-only period can support cash flow while delaying scheduled principal reduction.

Existing-Loan Fallback

The existing loan generally continues under its current contract until a refinance settles or the current lender formally approves a change.

Where the interest-only period ends first, principal and interest repayments may begin while the refinance is still being assessed or awaiting settlement.

The investor needs to understand both positions. One is the repayment that may apply if nothing changes. The other is the proposed repayment if an alternative is approved and completed.

What Do Lenders Reassess on an Interest-Only Refinance?

A refinance can require the lender to reassess the borrower’s financial position, security and requested structure. Factors commonly relevant to that assessment include:

Serviceability

Serviceability reflects whether the proposed debt meets the lender’s assessment requirements.

For authorised deposit-taking institutions (ADIs) regulated by the Australian Prudential Regulation Authority (APRA), the mortgage serviceability buffer remained at three percentage points following APRA’s 28 May 2026 review, so lenders generally assess repayments at a rate at least three percentage points above the loan’s interest rate.

APRA’s high debt-to-income (DTI) lending limits also remain in force in 2026. Since February 2026, ADIs have been required to keep residential mortgage lending at a DTI ratio of six times or more to no more than 20% of new lending in the owner-occupier portfolio and 20% in the investor portfolio.

The limit operates at portfolio level. It does not mean every individual borrower at or above a DTI of six must be declined. Individual lenders may apply additional servicing and credit settings. APRA reviews the buffer and the DTI limits periodically and may adjust them.

Income Evidence

A lender may reassess each income source being relied on for the refinance and require evidence that meets its policy.

An income increase since the original loan can change the servicing position, while reduced or less consistent income can narrow the available structures. The relevant amount is the income the lender accepts for its assessment.

Rental Income

Rental income can contribute to serviceability, but the amount accepted and the way it is assessed can vary between lenders.

The effect can become more significant across a portfolio because different treatment of several properties may alter the overall servicing result.

Existing Liabilities

Existing liabilities can affect the assessment because the lender may need to consider repayment commitments beyond the loan being refinanced.

An investor who has expanded a portfolio since the original loan was approved may receive a different result despite refinancing only one facility. A refinance that looks attractive in isolation may also have a different effect where the investor expects to borrow again.

Credit limits may also affect the assessment depending on lender policy.

Living Expenses

A lender may reassess household living expenses because they reduce the income available to meet the proposed repayments.

Lenders commonly compare declared expenses with a benchmark and may use the higher figure, so spending that has risen since the original loan can reduce the repayment the lender considers serviceable.

Property Valuation

A proposed lender may require a current valuation to establish the value of the property being offered as security and the resulting loan-to-value ratio.

The accepted valuation can affect available products, pricing or lending policy even where the loan balance itself has not changed. An investor’s own estimate does not replace the lender’s security assessment.

A higher property value does not create serviceability by itself.

Releasing equity for another purchase is a separate decision, since refinancing for another investment raises borrowing capacity and structure questions of its own.

Credit Conduct

A proposed lender may review current repayment history and the broader credit profile as part of the application.

One late payment does not produce the same outcome across every lender. Timing, frequency, severity, the account involved and lender policy can affect how it is treated.

Borrower Structure

Borrower structure can change the documents, guarantees and lender policies involved in the refinance.

An individual borrower with one residential investment property may have fewer entity-level requirements than a trust, company or self-managed super fund (SMSF) borrower.

An investment loan broker can review the proposed refinance against the investor’s wider debt and ownership structure where several facilities or entities are involved.

What Are the Options Before Interest-Only Expiry?

The available paths depend on lender policy, the existing contract and the investor’s current borrowing position:

New-Lender Refinance

A new-lender refinance replaces the existing debt with a new loan under newly approved terms.

The proposed loan may have a different rate, repayment type, term or feature set. Another interest-only period requires approval under the new lender’s policy and cannot be assumed because the current loan has one.

Switching costs may also apply. Depending on the loans involved, these can include discharge, application, valuation or settlement costs.

The refinance calculator can help compare an existing and proposed loan using its available inputs. Interest-only expiry still needs separate consideration because repayment type and remaining term affect the result.

Current-Lender Change

The current lender may consider a new interest-only period or another change to the loan, subject to its policy and any assessment it requires.

A requested change is not the same as the existing interest-only period continuing automatically.

Any current-lender option can be compared with the scheduled principal and interest repayment and the terms available through a refinance.

Scheduled Reversion

Scheduled reversion means the loan moves to principal and interest under its existing terms when the interest-only period ends.

For an investor who can absorb the higher repayment and wants the debt to reduce, the scheduled structure may fit their position.

The higher repayment does not establish that refinancing is preferable.

When Might Refinancing Before Expiry Fail to Improve the Position?

A refinance may offer little or no improvement where the proposed structure is weakened by one or more of the following factors:

Serviceability Constraints

Current income, expenses and debts may not support the requested refinance under the proposed lender’s criteria.

An investor may have added rental income since the original approval while also adding substantial debt. Another borrower may have reduced working hours, experienced a change in household income or moved into self-employment.

A proposed interest-only structure remains conditional until the lender has completed the relevant assessment.

Lower Valuation

A lower valuation can increase the loan-to-value ratio and may affect available products, pricing or policy thresholds.

It does not automatically prevent refinancing. The proposed structure needs to be tested against the valuation accepted by the lender.

Where the investor also wants to increase the loan amount, a lower valuation may reduce the amount available within the lender’s loan-to-value limits.

Fixed-Rate Break Costs

Refinancing before a fixed-rate period expires may result in a break fee or other switching costs.

The amount depends on the existing loan and lender calculation. An investor considering an early exit can obtain the applicable figure from the current lender before comparing the refinance.

A lower proposed repayment may be less compelling once the actual switching costs are included.

Longer Loan Term

A longer loan term can reduce the required monthly repayment by spreading principal across more years while potentially increasing the period over which interest is paid.

This matters where the existing loan has already been running for several years. Resetting a shorter remaining term to a longer new term can make the monthly comparison look favourable even when the rate difference is modest.

Extra Borrowing

A refinance that replaces only the existing debt is different from one that also increases the balance for another purpose.

Additional borrowing may introduce separate lender, tax or structural considerations depending on how the funds are used.

Tax rules for residential investment property are also changing, with legislation passed in June 2026 limiting negative gearing from 1 July 2027 for established residential property acquired after 7:30 pm Australian Eastern Standard Time on 12 May 2026.

A qualified tax adviser can confirm how investment refinance tax issues apply where the balance will increase.

What Should You Prepare Before a Refinance Application?

The documents required vary by lender, borrower and structure. The following categories are a general guide only, and the proposed lender may request additional or different information:

Loan Details

Current loan information may include the balance, interest rate, repayment type, interest-only expiry date, remaining term and any separate fixed-rate expiry.

Investors with multiple loan splits can identify which facility carries the interest-only period and whether the splits have different rates, expiry dates or purposes.

This establishes the debt being refinanced and the scheduled position if no change occurs.

Identity Documents

A new lender generally needs to verify each borrower’s identity and, for trusts, companies and SMSFs, the identity of the people who control them.

Income Documents

The lender may require current evidence for the income used in its assessment.

The documents depend on the borrower’s employment or business structure and the lender’s policy. A self-employed applicant may need different evidence from a salaried employee.

A self-employed home loan broker can help identify lender documentation requirements that may apply to a business owner’s income structure.

Rental Evidence

The lender may request current lease information, rental statements, valuation-related rental evidence or other documents accepted under its policy.

The lender can then apply its own assessment treatment to the verified rental income.

Portfolio investors may find it useful to keep each property’s rental evidence matched to the relevant property and loan.

Liability Records

Current records can cover the debts and credit facilities relevant to the lender’s assessment.

These may include owner-occupied loans, investment loans, personal lending, car finance and revolving credit facilities.

For a multi-lender portfolio, matching each liability to its balance, limit and repayment structure can reduce errors when the refinance is modelled.

Expense Records

The lender may request recent transaction statements or a declared household budget to verify the living expenses used in its assessment.

Property Information

The lender may need property information to complete its security assessment and valuation process.

Where several properties are involved, identifying which property secures each loan can also reveal security arrangements that may affect the refinance process.

Entity Documents

Trusts, companies and SMSFs can require documents that do not arise in an individual application.

The exact requirements depend on the entity, lender and loan structure. SMSF property borrowing commonly involves a limited recourse borrowing arrangement (LRBA), which adds structure and security requirements that do not apply to an ordinary individual investment loan.

Since 10 August 2026, a new LRBA can generally be used to acquire only business real property, although an existing residential LRBA can still be refinanced for the same asset.

A broker handling SMSF loans can review lender requirements for the refinance, while legal, tax and superannuation matters remain for appropriately qualified professionals.

Funds Purpose

Any amount borrowed above what is required to repay the existing debt can have its own purpose.

The lender may need to understand that purpose as part of the application.

Keeping the existing refinance and additional borrowing separately identified can make both parts easier to assess.

Clarity Before the Interest-Only Repayment Reset

The interest-only expiry no longer needs to be treated as a single deadline with one automatic response. The existing loan has a scheduled repayment path, while any refinance or lender-approved change depends on what the investor’s current position supports.

Knowing the repayment that will apply after expiry gives the investor a firm reference point. Any alternative can then be judged against that figure using its rate, repayment type, term, switching costs and lending assessment.

Where your interest-only period is approaching its end, the team at Unconditional Finance can talk you through refinance structures that may fit your current position.

Frequently Asked Questions (FAQs)

1. Can I make extra repayments during a new interest-only period?

It depends on the loan product and its terms. Some loans may allow additional repayments during an interest-only period, while restrictions or costs can apply to other products, particularly where a fixed rate is involved.

The repayment conditions of the proposed loan should be checked before relying on voluntary principal reductions as part of the strategy.

2. Can I refinance one investment loan and leave my other loans with their current lenders?

Potentially. Whether one investment loan can move independently depends partly on the existing security arrangements and how the loans are structured.

Where several properties or facilities are linked, refinancing one loan may require additional security releases or restructuring. The proposed lender may also assess the investor’s wider liabilities and rental income even when those other loans remain with their existing lenders.

3. Can I switch to principal and interest before the interest-only period ends?

Many lenders allow a borrower to switch to principal and interest early on request, subject to the loan terms.

Where the loan is on a fixed rate, changing the repayment type during the fixed period may involve costs, so the loan conditions are worth checking first.

4. Can part of the loan stay interest-only while the rest reverts?

Some lenders allow a loan to be split so one portion moves to principal and interest while another continues on interest-only terms.

The interest-only portion still needs approval under the lender’s policy, and each split may carry its own rate and expiry date.

5. Will my interest rate change when the loan reverts to principal and interest?

It may. The rate after reversion depends on the loan contract, and many lenders price interest-only loans higher than principal and interest loans.

Checking the rate that will apply after expiry gives a more accurate picture of the scheduled repayment than the current interest-only rate.

6. Are interest-only investment loans still available?

Yes, subject to lender policy. APRA has not activated a limit on new interest-only lending, although its framework allows one to be introduced if needed.

Individual lenders set their own interest-only terms, maximum periods and assessment requirements.

7. What happens if I cannot afford the principal and interest repayments?

Borrowers experiencing financial hardship can ask their lender for a hardship variation, such as a temporary change to repayments or loan terms. The lender must respond in writing, generally within 21 days.

Free financial counselling is also available through the National Debt Helpline on 1800 007 007.

This content provides general information only and does not take your objectives, financial situation or needs into account. Lending criteria, policies and assessment outcomes vary between lenders and may change. You may wish to speak with qualified finance, tax, legal or other relevant professionals before acting on information relevant to your circumstances.