Beginner's Guide to Fixed Rate Investment Loans

What Is a Fixed Rate Investment Loan?

A fixed rate investment loan locks your interest rate for an agreed period, typically between one and five years. During that period, your repayments stay the same regardless of market rate movements, which can make budgeting and cash flow forecasting more predictable when you own a rental property.

For Moorabbin investors managing a rental alongside owner-occupied debt or planning to scale a portfolio over the next few years, that predictability can be the difference between holding through a vacancy and selling under pressure. The suburb's proximity to Moorabbin Airport, DFO shopping precinct and the Nepean Highway employment corridor has maintained steady rental demand, particularly from professionals and small families. Locking a rate can help you hold through short-term vacancy periods without compromising serviceability.

How Fixed Rates Differ from Variable Rates for Investment Property

Variable rates move with the market, so your repayment can change each month. Fixed rates stay the same for the agreed term, but you give up flexibility in return for certainty.

On a variable rate loan, you can usually make extra repayments without penalty, redraw surplus funds, and refinance or exit without break costs. Fixed rate loans often restrict these features. Most lenders cap extra repayments during the fixed period at around $10,000 to $30,000 per year, and breaking the loan early can trigger significant costs if rates have fallen since you locked in. That makes fixed rates better suited to investors who want stable repayments and do not plan to sell, refinance or pay down the loan aggressively during the fixed term.

Who Should Consider a Fixed Rate for Investment Property?

Fixed rate investment loans suit investors who value repayment certainty over flexibility and who are confident they will hold the property through the fixed period.

Consider an investor who purchases a two-bedroom unit in Moorabbin to rent out while continuing to pay down their owner-occupied home. They plan to hold the unit for at least five years, do not intend to make lump-sum repayments on the investment loan, and want to lock in today's rate before the Reserve Bank moves. A three-year fixed rate on an interest-only structure gives them stable monthly outgoings and a clear view of net rental yield over that period, which simplifies tax planning and cash flow forecasting. That investor can afford to give up redraw and extra repayment features because they are not planning to use them.

Fixed rates are less suitable if you plan to sell within two years, refinance to access equity for another purchase, or make irregular lump-sum repayments from bonuses or rental surpluses.

Interest-Only or Principal-and-Interest on a Fixed Rate?

You can fix the rate on either an interest-only or principal-and-interest investment loan. The choice depends on your cash flow needs and tax position.

Interest-only repayments are lower, which can improve cash flow and increase the size of your tax deduction in the years the loan remains interest-only. Under current tax rules, interest on borrowings to acquire or hold a rental property is deductible against assessable income. For properties acquired on or after 7:30pm AEST on 12 May 2026, net rental losses from 1 July 2027 can only be offset against other residential rental income or carried forward, not against salary or wages. That quarantine rule makes interest-only structures less valuable for single-property investors who previously relied on negative gearing to reduce their overall tax.

Principal-and-interest repayments build equity faster and reduce the outstanding loan balance over time. If you fix a principal-and-interest loan for three years, the repayment stays the same but the portion going toward principal increases and the portion going toward interest decreases each month. At the end of the fixed term, the loan balance will be lower than it would have been under interest-only, which can improve your borrowing capacity for future purchases.

Fixed Rate Break Costs: How the Calculation Works

Break costs apply when you repay, refinance or switch a fixed rate loan before the end of the fixed period, and the lender's cost of funds has changed since you locked in.

The lender calculates break costs by comparing the fixed rate you are paying with the wholesale rate the lender can now earn by lending that money elsewhere for the remaining term. If rates have fallen, the lender loses income and passes that cost to you. If rates have risen, there is usually no break cost. The calculation depends on the remaining fixed term, the outstanding loan balance, and the movement in wholesale swap rates since you fixed.

In our experience, borrowers underestimate break costs when they fix at a higher rate and then try to refinance a year later after variable rates drop. A $400,000 fixed rate loan with three years remaining and a 1 per cent fall in swap rates can produce a break cost in the range of $10,000 to $15,000, though the exact figure depends on the lender's methodology and the precise rate differential. That cost is rarely disclosed upfront and only becomes clear when you request a payout figure. If you are considering a fixed rate, plan to hold the loan through the full term or confirm with your broker how break costs are calculated before locking in.

Split Rate Structures for Investment Loans

A split loan divides your borrowing into two portions, one fixed and one variable, giving you partial rate protection without sacrificing all flexibility.

A common split is 50 per cent fixed for three years and 50 per cent variable. The fixed portion delivers stable repayments on half the loan, and the variable portion lets you make extra repayments, access redraw, and refinance or sell without triggering break costs on the full balance. For Moorabbin investors who want rate certainty but may need to access equity or adjust their investment loan structure within a few years, a split can deliver both.

You can adjust the split to suit your risk tolerance. A 70 per cent fixed, 30 per cent variable split gives more certainty, while a 30 per cent fixed, 70 per cent variable split gives more flexibility. The repayments on each portion are calculated separately, so you will have two loan accounts with different rates, terms and feature sets.

Fixed Rate Periods and Portfolio Planning

When you fix a rate on an investment loan, the length of the fixed period should align with your next planned portfolio move.

If you plan to purchase a second property in two years and will need to refinance the first loan to access equity or consolidate debt, a one or two-year fixed term keeps your options open. If you are confident you will hold the property for five years without needing to access equity or adjust the structure, a longer fixed term can lock in certainty over that full period.

Moorabbin's position within the Kingston local government area and its proximity to established bayside suburbs has supported steady capital growth over the long term, particularly for older-style units and townhouses within walking distance of Moorabbin Station. Investors building a portfolio across the south-east corridor often fix the rate on their first property for a shorter period, then reassess once the second purchase settles and the portfolio structure is clearer.

How Lenders Assess Serviceability on Fixed Rate Investment Loans

Lenders assess your ability to service an investment loan at a rate at least 3 percentage points above the actual loan rate, regardless of whether you choose fixed or variable.

That buffer is set by APRA and applies to all new residential loans from authorised deposit-taking institutions. If you fix your investment loan at 6 per cent, the lender will assess your income and expenses as though the rate were 9 per cent. Rental income is typically shaded by 20 per cent to account for vacancy and management costs, so if the property generates $2,000 per month in rent, the lender will include $1,600 per month in your serviceability calculation.

From 1 February 2026, lenders can fund no more than 20 per cent of new investor loans at a debt-to-income ratio of 6 times or greater. That cap applies separately to each lender's investor portfolio and affects high-income borrowers with large existing debts more than it affects first-time investors. If your total debt across all loans exceeds six times your gross annual income, some lenders will decline the application regardless of your deposit or repayment history. A mortgage broker in Moorabbin can identify which lenders have capacity under the cap and structure your application to maximise approval prospects.

Refinancing a Fixed Rate Investment Loan

You can refinance a fixed rate investment loan before the fixed period ends, but you will usually pay break costs if rates have fallen since you locked in.

Refinancing during a fixed term makes sense when the benefit of a lower rate, improved features or consolidated debt outweighs the break cost. If your current lender quotes a $12,000 break cost and the new lender offers a rate 1.5 per cent lower with a $3,000 cashback, the net cost is $9,000. If the monthly saving on the new rate is $400, you recover the break cost in under two years and save money from that point forward.

Some lenders will waive or discount break costs if you refinance internally to a new product with the same lender, though that is rare for investor loans. If you are approaching the end of a fixed term and rates have moved, speak to your broker about refinancing options six months before the fixed period expires, so you have time to compare offers and avoid rolling onto a higher revert rate.

Tax Implications of Fixed Rate Investment Loans

Interest on a fixed rate investment loan is deductible in the same way as interest on a variable rate loan, provided the borrowing is used to acquire or hold a property that produces assessable income.

For properties acquired on or after 7:30pm AEST on 12 May 2026, net rental losses from 1 July 2027 are quarantined and can only be offset against other residential rental income or carried forward to offset future rental income or capital gains. Losses cannot be offset against salary or wages. Properties held before that date continue under the existing negative gearing rules until sold. If you purchased a Moorabbin rental before mid-May 2026 and the property is negatively geared, you can still claim the net loss against your salary under the grandfathered rules.

Fixed rate loans do not change the deductibility of interest, but they do make it simpler to forecast your annual deduction. If you fix the rate and repayment for three years, you know exactly how much interest you will pay each financial year, which can simplify tax planning and help you estimate your refund or liability in advance.

Call one of our team or book an appointment at a time that works for you. We work with Moorabbin investors to structure investment property finance that aligns with your portfolio goals, tax position and long-term strategy, and we have access to investment loan options from banks and lenders across Australia.

Frequently Asked Questions