Top tips to secure an investment loan pre-approval

Pre-approval tells you what you can borrow before you start looking at properties.

For medical professionals investing in property, pre-approval means you can move quickly when the right opportunity appears. You know your borrowing limit, the deposit you need, and which lenders will support your income structure. The process takes one to three weeks depending on how your income is documented and whether you hold existing debt.

Why lenders assess investment loans differently

Lenders apply a rental income discount when calculating serviceability for investment loans. Most lenders assume 80 per cent of the rental income to account for vacancy, maintenance and management costs. If a property generates $600 per week in rent, the lender uses $480 per week in the serviceability assessment. That reduction affects how much you can borrow.

APRA requires all authorised deposit-taking institutions to assess borrowers at an interest rate at least 3.0 percentage points above the loan product rate. For an investor loan priced at 6.5 per cent, serviceability is tested at 9.5 per cent. Non-bank lenders are not subject to APRA requirements and may use a lower buffer, which can increase your borrowing capacity if income or existing commitments are tight.

Consider a registrar earning $180,000 base plus overtime who wants to borrow for a unit expected to rent at $550 per week. The lender will assess the loan using $440 per week rental income, test repayments at 9.5 per cent, and factor in all existing debts including HECS, car finance and credit card limits. If the registrar holds a $15,000 credit card limit but never uses it, the lender still assumes a monthly repayment based on that limit. Closing or reducing the limit before applying can lift borrowing capacity by $50,000 to $80,000.

How deposit requirements shift with loan size and LVR

Most lenders allow investment loans up to 90 per cent loan-to-value ratio, but anything above 80 per cent attracts Lenders Mortgage Insurance. LMI is a one-off premium that protects the lender if you default. It is not refundable and does not protect you. The premium increases sharply above 85 per cent LVR and can add $10,000 to $30,000 to your upfront costs depending on loan size.

Some lenders offer LMI waivers for medical professionals at LVRs up to 90 per cent, which removes that cost entirely. Eligibility depends on your profession, registration status, and income level. A specialist or GP principal is more likely to qualify than a junior registrar, though some lenders extend the waiver to advanced trainees.

If you are borrowing $500,000 at 85 per cent LVR, the deposit is $88,235 and LMI might be $15,000. At 80 per cent LVR, the deposit is $125,000 and LMI does not apply. The LMI waiver closes that gap by removing the $15,000 premium, meaning you need $88,235 instead of $140,000 to avoid the additional cost.

Income documentation for pre-approval

Lenders assess income differently depending on how you are paid. Salaried employees submit recent payslips and a letter of employment. If you receive overtime, penalties or allowances, most lenders average those payments over three to twelve months. Consistent overtime is treated as ongoing income. Sporadic overtime is either excluded or averaged with a discount.

Contractors and locums need to show income stability over a longer period. Most lenders require two years of tax returns plus recent contracts or a letter from the agency confirming ongoing work. Some specialist lenders accept one year of tax returns if the contractor is recently qualified and the work history is continuous. If you have moved from salary to contract work in the past twelve months, expect lenders to request both payslips from your previous role and tax returns or contracts from the current one.

Partnership income or income from a private practice is assessed using tax returns, often averaged over two years. If your most recent year shows a significant increase, some lenders will use the higher figure if supported by practice financials. Others will average or take the lower year. The approach varies by lender, which is why pre-approval across multiple lenders can produce different borrowing limits.

Fixed or variable rate for an investment loan

Variable rates currently sit lower than most fixed terms, and they allow full offset accounts. An offset account linked to an investment loan reduces the interest you pay without affecting the deductibility of loan interest. If you hold $50,000 in offset against a $500,000 investment loan, you pay interest on $450,000 but can still claim the full loan interest as a deduction.

Fixed rates lock in your repayment for one to five years but remove access to offset and often limit extra repayments to $10,000 or $20,000 per year without penalty. If you fix at 6.2 per cent and variable rates drop to 5.8 per cent, you are locked in. If you need to sell or refinance before the fixed term ends, break costs can run to tens of thousands of dollars.

Some borrowers split the loan, fixing part for certainty and leaving part variable for flexibility. A 50-50 split gives you access to offset on half the loan and protects half the debt from rate rises. The split does not need to be equal. You can fix 30 per cent and leave 70 per cent variable, or any combination that suits your risk tolerance and cash flow.

Interest-only repayments and cash flow

Interest-only repayments reduce the monthly cost of holding an investment property. On a $500,000 loan at 6.5 per cent, interest-only repayments are around $2,700 per month. Principal and interest repayments on the same loan are around $3,200 per month. That $500 per month difference improves cash flow, particularly if the property is negatively geared.

Negative gearing allows you to offset rental losses against your other income, reducing your taxable income. If the property costs $3,200 per month to hold and generates $2,000 per month in rent, the $1,200 monthly shortfall is deductible. At a marginal tax rate of 39 per cent (including Medicare Levy), that shortfall reduces your tax by around $468 per month, bringing the true out-of-pocket cost to $732 per month.

Proposed changes to negative gearing rules, intended to take effect from 1 July 2027, will limit this treatment to new builds only. Established properties purchased after 12 May 2026 will have rental losses quarantined, meaning you can only offset them against rental income or capital gains from residential property. The changes are not yet law. Properties held before 12 May 2026 are exempt until sold.

Most lenders allow interest-only terms of one to five years on investment loans. After that period, the loan reverts to principal and interest unless you apply to extend the interest-only term. Lenders typically allow one or two extensions depending on your equity position and serviceability at the time.

Debt-to-income limits and borrowing capacity

From 1 February 2026, APRA introduced a debt-to-income limit requiring that no more than 20 per cent of new lending from authorised deposit-taking institutions can be issued at a debt-to-income ratio of six times income or more. The limit applies separately to investor and owner-occupier portfolios and is measured quarterly.

If you earn $200,000 and already hold $800,000 in owner-occupier debt, your debt-to-income ratio is four times. Adding a $600,000 investment loan would take your total debt to $1,400,000, or seven times income. That application may be declined by some lenders who have already reached their quarterly limit, even if serviceability is sound.

Non-bank lenders are not subject to APRA settings and may still approve the loan if serviceability supports it. The debt-to-income limit does not prevent you from borrowing, but it does narrow the pool of lenders willing to proceed if your ratio sits above six times.

What a pre-approval includes and how long it lasts

A pre-approval confirms the loan amount, deposit required, LVR, and whether LMI applies. It also identifies the lender, loan type, interest rate structure, and any conditions that need to be met before formal approval. Common conditions include a satisfactory valuation, signed contract of sale, and updated payslips if the pre-approval is more than three months old.

Pre-approvals are typically valid for three to six months depending on the lender. If your income or circumstances change during that period, the lender may reassess. A pre-approval is not a guarantee, but it does mean the lender has reviewed your income, debts, expenses and credit file and is willing to proceed subject to a property being identified and valued.

If you are comparing interstate properties or considering multiple markets, pre-approval gives you a clear ceiling and removes the risk of making an offer you cannot fund. You can adjust your search based on the confirmed loan amount rather than an estimate.

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Frequently Asked Questions