Unlock the Secrets to Fixed Rate Investment Loan Terms

Fixed Rate Investment Loan Terms: What They Are and Why They Matter

A fixed rate investment loan locks your interest rate for a specific period, typically between one and five years.

The term you choose affects your monthly cash flow, your ability to claim interest deductions, and how much flexibility you retain if market conditions shift or your circumstances change. For working professionals and self-employed borrowers in Paddington, where the median terrace house sits around $3,600,000 and rental yields average 2.24 per cent, the difference between a two-year and a five-year fixed term can reshape your entire holding strategy. A shorter fixed term preserves access to offset accounts and keeps prepayment options open, while a longer term offers protection against rate rises but limits your ability to adapt without triggering break costs.

How Fixed Rate Terms Affect Borrowing Capacity Under Current Serviceability Rules

Lenders assess your ability to service an investment loan at a minimum of 3.0 percentage points above the actual loan rate, regardless of whether you choose fixed or variable.

This buffer has remained at 3.0 percentage points since October 2021 and was confirmed again in May 2026. For an investor borrowing $2.8 million to purchase a Paddington terrace, a fixed rate quoted at 5.8 per cent would be assessed at 8.8 per cent. If you are self-employed, lenders will also apply a 20 per cent loading to net profit after add-backs, which tightens capacity further. The fixed rate term itself does not change the serviceability calculation, but it does determine how long you are protected from having to requalify if variable rates climb during the fixed period. A five-year fixed term shields you from needing to demonstrate ongoing capacity until the term expires, while a two-year term brings that reassessment forward.

Interest Only Repayment Structures and Fixed Rate Terms

Most investment loans in this price bracket are structured with interest only repayments for the first one to five years.

Under the prudential standard APS 112, a loan is classified as non-standard if the interest-only period exceeds five years and the loan-to-value ratio is above 80 per cent. This classification attracts higher capital risk weighting for the lender, which usually means a higher interest rate or stricter lending terms for you. If you are purchasing a $3.6 million terrace in Paddington with a 20 per cent deposit and want to maximise tax deductions while keeping monthly outgoings low, a three-year interest-only period matched to a three-year fixed rate is a common structure. At current variable rates, a $2.88 million loan on interest only at 5.8 per cent would cost approximately $13,920 per month. That same loan on principal and interest over 30 years would cost closer to $16,800 per month, a difference of nearly $2,900 each month that could be directed toward holding costs or offset against other income.

Fixed Rate Break Costs and How They Are Calculated

If you exit a fixed rate loan early, whether to sell the property, refinance to a lower rate, or switch lenders, the bank will charge a break cost.

The break cost is calculated based on the difference between your fixed rate and the wholesale rate the lender can now earn on the money for the remaining term. If rates have fallen since you fixed, the break cost can run into tens of thousands of dollars. If rates have risen, the break cost is usually zero or minimal. Consider an investor who fixed $2.88 million at 5.9 per cent for five years in early 2025. By mid-2026, after the Reserve Bank cut the cash rate to 3.85 per cent, wholesale swap rates had also fallen. Exiting that loan with three and a half years remaining could trigger a break cost exceeding $80,000, depending on the exact movement in swap rates. That cost would need to be paid upfront or capitalised into the new loan, and it is not tax deductible. Shorter fixed terms reduce the window in which large break costs can accumulate.

Fixed Rate Terms and Negative Gearing Changes from the 2027-28 Income Year

From the 2027-28 income year, losses on established residential investment properties acquired after 12 May 2026 can only be offset against income from other residential properties, not against salary or wage income.

This change does not affect properties held at 7:30pm AEST on 12 May 2026, or new builds, which retain full negative gearing. If you purchased a Paddington terrace after that date, your ability to use interest deductions to reduce taxable employment income ends from 1 July 2027. A five-year fixed rate loan taken out in mid-2026 would still be charging a fixed rate through to 2031, but from 2027 onward those interest costs would only reduce your tax bill if you had other residential property income or capital gains to offset. For a self-employed professional earning $250,000 per year, losing the ability to negatively gear $167,000 in annual interest against that income represents a tax cost of around $77,000 per year at the top marginal rate. The fixed rate term does not change the tax treatment, but it does lock in your interest cost while the tax benefit shrinks.

Debt-to-Income Limits and How They Interact with Fixed Rate Loans

From 1 February 2026, lenders can allocate no more than 20 per cent of new investor loans to borrowers with a total debt-to-income ratio of six times or greater.

This limit applies across your entire debt position, including owner-occupied loans, car loans, and existing investment debt. If your total household income is $300,000 and you already hold $1.5 million in debt, you are at a DTI of five. Adding a $2.88 million investment loan would push your total debt to $4.38 million, or a DTI of 14.6. Most major lenders will decline that application outright under the new limit, regardless of whether you choose fixed or variable. The fixed rate term does not affect the DTI calculation, but it does influence your repayment buffer and therefore your ability to service additional debt in future. A shorter fixed term allows you to switch to a lower variable rate sooner if rates fall, which improves cash flow and may create headroom for further portfolio growth.

Split Rate Strategies: Combining Fixed and Variable Terms

Many investors split their loan between a fixed portion and a variable portion to balance certainty with flexibility.

A common structure is 50 per cent fixed for three years and 50 per cent variable with a full offset account attached to the variable portion. This allows you to lock half your interest cost, retain access to offset on the variable half, and avoid a large break cost if you need to exit early. For a $2.88 million loan on a Paddington terrace, splitting $1.44 million fixed at 5.8 per cent and $1.44 million variable at 6.1 per cent with $200,000 in offset would result in monthly interest of approximately $13,200. If rates rise by 0.5 percentage points, only the variable half is affected, adding around $600 per month rather than $1,200. If you need to sell within the fixed term, the break cost applies only to the fixed portion, cutting the potential penalty in half.

How Lenders Mortgage Insurance Interacts with Fixed Rate Investment Loans

Lenders mortgage insurance is generally required on investment loans where the loan-to-value ratio exceeds 80 per cent.

The premium is calculated on a sliding scale based on the loan amount and LVR, and it does not reduce if you choose a fixed rate over variable. For an investor purchasing a $3.6 million Paddington terrace with a 15 per cent deposit, the loan amount would be $3.06 million at an LVR of 85 per cent. LMI on that loan could range from $65,000 to $90,000 depending on the lender and your employment type. Self-employed borrowers often face higher LMI premiums due to perceived income volatility. The fixed rate term does not affect the LMI cost, but it does affect your ability to refinance and remove LMI once your LVR drops below 80 per cent through capital growth or principal repayment. A shorter fixed term gives you an earlier opportunity to refinance without break costs.

Refinancing an Existing Investment Loan to a New Fixed Rate Term

If you hold an investment loan on a variable rate and rates are expected to rise, refinancing to a fixed rate can lock in current pricing.

However, refinancing always involves a new credit assessment under current serviceability rules, including the 3.0 percentage point buffer and the 20 per cent DTI limit on high-DTI investor loans. If your income has not kept pace with debt growth, or if rental income has softened, you may not qualify for the same loan amount under a new application. In our experience, self-employed borrowers refinancing investment loans are often asked to provide two full years of financials and recent BAS statements, even if the original loan was approved on a single year of tax returns. The fixed rate term you select during refinancing should align with your expected holding period. If you plan to sell within three years, a two-year fixed term avoids the risk of break costs eating into your sale proceeds.

Call one of our team or book an appointment at a time that works for you. We'll walk through your current loan structure, compare fixed and variable options across the lenders we work with, and help you choose a term that fits your income profile and investment timeline.

Frequently Asked Questions