When to Structure Your Investment Loan for Growth

Self-employed investors face a specific challenge when structuring investment property finance: lenders assess your income differently, and your borrowing capacity depends on how well your loan structure supports both serviceability today and portfolio growth tomorrow.

How Lenders Calculate Investment Loan Serviceability for Self-Employed Borrowers

Lenders assess your ability to service an investment loan by applying a buffer of at least 3.0 percentage points above the loan product rate, then testing that repayment against your declared income. For self-employed borrowers, your declared income is typically averaged over two years of tax returns, and many lenders will add back depreciation and certain business expenses. The issue arises when your rental income is counted at only 80 per cent of the lease amount to account for vacancy, while your repayments are tested at a rate much higher than what you will actually pay. A variable rate loan assessed at 8.5 per cent for serviceability purposes might have an actual rate closer to 6.0 per cent, meaning the lender's calculation is conservative by design.

Consider a scenario where a self-employed consultant in Sydney has averaged $140,000 in taxable income over the past two financial years and is purchasing an investment property generating $650 per week in rent. The lender will count $520 per week as rental income after applying the 80 per cent factor, while testing loan repayments at a buffered rate. If the borrower opts for principal and interest repayments on a loan amount of $600,000, the monthly repayment at the buffered rate could exceed $4,800, which reduces the amount they can borrow on their next property. Switching to an interest-only structure reduces the assessed repayment to around $4,250 per month at the same buffered rate, improving serviceability for future lending without changing the actual cost materially in the first few years.

Interest-Only Investment Loans and How They Affect Future Borrowing

An interest-only loan allows you to defer principal repayments for a set period, typically up to five years, which reduces your monthly outgoings and improves serviceability when lenders assess your capacity to take on additional debt. The benefit is not in the interest rate, which is often slightly higher on interest-only products, but in how much borrowing capacity you retain after this purchase. Each dollar of monthly repayment you save on your first investment property is a dollar of income available to service the second.

Interest-only loans do attract higher risk weighting under the current prudential framework, which means lenders price them slightly above principal and interest loans at the same loan to value ratio. The difference in rate is often between 0.10 and 0.30 percentage points depending on the lender and your LVR. Where the structure becomes valuable is when you plan to acquire multiple properties over a short period. If you purchase one property on principal and repayments, your next application will be assessed with that full repayment deducted from your income. If you hold that first loan on interest-only terms, your serviceability position is stronger, and you may be able to borrow an additional $80,000 to $120,000 on your second purchase depending on your income and the rental yield of both properties.

Fixed or Variable Rates for Investment Property Finance

Fixed rates give you certainty over repayments for a set term, but they limit your ability to make extra repayments or access offset features, and they can incur break costs if you exit the loan before the fixed period ends. Variable rates are more flexible, and most variable investment loans allow full offset accounts, which is useful when managing cash flow or building a buffer for future deposits. Self-employed borrowers often prefer variable loans with offset because lumpy income can be parked in the offset account to reduce interest without locking funds into the loan.

In our experience, investors who intend to refinance or sell within three years tend to avoid fixed rates, as break costs can outweigh the benefit of rate certainty if rates fall or if you need to restructure your lending for portfolio growth. Lenders calculate break costs based on the difference between your fixed rate and the wholesale funding rate for the remaining term, and those costs can reach several thousand dollars even on a moderately sized loan. Variable loans do not incur these costs, and most lenders allow you to split your loan between fixed and variable if you want partial certainty without sacrificing all flexibility.

Debt-to-Income Limits and How They Apply to Investment Lending

From February this year, lenders have been required to limit the proportion of new loans issued to borrowers with a total debt-to-income ratio of six times or greater. Each lender can issue up to 20 per cent of new investor loans above that threshold in any given quarter. For a self-employed borrower with averaged taxable income of $140,000, a DTI of six times equates to total lending of $840,000 across all properties and business debts. If you already have a home loan of $500,000 and are applying for an investment loan of $600,000, your total exposure is $1.1 million, which exceeds the six times threshold and places your application in the restricted pool.

This does not mean your application will be declined, but it does mean the lender must prioritise your file within their quarterly allocation, and you may face closer scrutiny of your income documentation and rental assumptions. In practice, borrowers with strong servicing, low LVR and consistent income history can still access lending above six times DTI, but the approval process may take longer and the rate offered may be less competitive. Some smaller lenders and non-bank lenders are not subject to the same DTI restrictions, which makes them a useful option when your total debt level sits just above the threshold and your income is well-documented.

Using Equity Release to Fund Your Deposit Without Selling

If you own property with sufficient equity, you can access that equity to fund the deposit and settlement costs on your next investment property without selling or using cash savings. Lenders will generally allow you to borrow up to 80 per cent of the value of your existing property without requiring lenders mortgage insurance, meaning if your home is worth $1.2 million and your current loan is $600,000, you have access to $360,000 in usable equity before hitting the 80 per cent threshold. That amount is more than enough to cover a 20 per cent deposit and costs on a property valued up to $1.5 million.

Equity release works by increasing the loan secured against your existing property, with the additional funds either paid directly to you or held in an offset account until settlement. The benefit for self-employed investors is that you avoid liquidating business assets or drawing down cash reserves that may be needed for working capital. The additional borrowing is assessed as part of your overall serviceability, so the rental income from the new investment property is factored in to support the increased debt. Most lenders will structure this as a separate split or sub-account within your existing facility, which gives you clarity over how much debt is tied to each property and simplifies future refinancing or sale.

Loan to Value Ratio and Lenders Mortgage Insurance on Investment Purchases

Lenders mortgage insurance is required when your LVR exceeds 80 per cent, and the premium increases sharply as the LVR rises above 85 per cent. On an investment loan amount of $700,000 at 85 per cent LVR, the LMI premium might sit between $15,000 and $22,000 depending on the lender and insurer, and that cost is capitalised into the loan unless you pay it upfront. At 90 per cent LVR, the premium can exceed $35,000 on the same loan amount, which erodes your equity position from day one and increases your repayments.

For self-employed borrowers, staying at or below 80 per cent LVR is often the most cost-effective approach, particularly if you can access equity from an existing property or combine savings with a smaller loan to avoid the insurance cost entirely. Some lenders offer slightly better pricing at 80 per cent LVR compared to higher tiers, as the loan does not attract the same capital risk weighting under the prudential standards. Where paying LMI is unavoidable, it is worth comparing the premium across multiple lenders, as the cost can vary by several thousand dollars for the same loan amount and LVR.

Tax Deductions on Investment Property Borrowing Costs

Interest on borrowings used to acquire or hold a rental property is deductible against your assessable income, along with other holding costs such as council rates, insurance, property management fees, repairs and depreciation. For properties held before mid-May, losses from the property can be offset against your other income, including salary or business income, which reduces your overall tax liability. This treatment continues for those properties even after the 2027-28 income year, as existing investments are grandfathered under the current legislation.

For properties purchased after that date, losses can only be offset against income from other residential properties or carried forward to future years. The change does not affect positive cash flow properties or properties that break even, and it does not change the deductibility of interest or other expenses. It changes where those deductions can be applied. Self-employed investors with multiple income streams may find the grandfathered treatment of existing properties more valuable over time, particularly if they plan to build a portfolio that includes both established and new properties, as new builds remain eligible for full loss offset regardless of purchase date.

We work with self-employed investors across Sydney who are building portfolios with a focus on serviceability and tax efficiency. The structure you choose now will determine how much you can borrow in two years, and how much flexibility you retain as your business income fluctuates. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions