How to Build a Multi-Property Portfolio as a Dentist

Structuring Your First Investment Loan to Allow for a Second

The way you structure your first investment loan determines whether a second property is even possible. Most public health dentists we speak with have solid incomes, but serviceability becomes the constraint when lenders assess your capacity to service multiple mortgages alongside living expenses.

Consider a public health dentist earning around $160,000 working full-time in a metro area. They purchase their first investment property using an interest-only loan structure with a 20% deposit. The interest-only repayments are lower than principal and interest, which means more of their income remains available when a lender calculates serviceability for a second purchase. If they had chosen principal and interest repayments from the start, their borrowing capacity for the next property could be reduced by $80,000 to $120,000 depending on the lender's assessment rate. The outcome is they can purchase a second property within 18 months using equity from the first, rather than waiting years to rebuild serviceability.

When you're planning beyond one investment property, interest-only loans for dentists reduce your committed repayments and preserve your ability to borrow again. Lenders assess your loan serviceability using the actual repayment amount, so a lower monthly commitment means you can support additional debt. The structure you choose now either opens the door to property two and three, or closes it.

Using Equity Release Without Refinancing Everything

You don't need to refinance your entire loan to access equity for your next deposit. If your first property has increased in value or you've paid down some of the principal, you can apply to increase the loan amount on that property and use the released equity as a deposit for the second.

Lenders will reassess your borrowing capacity and the loan to value ratio on the first property. If the property was purchased at $600,000 and is now worth $680,000, and your loan balance is $480,000, you have around $200,000 in equity. A lender may allow you to borrow up to 80% of the current value without paying Lenders Mortgage Insurance, which means you could access roughly $64,000 in usable equity for your next purchase while keeping the original loan in place.

This approach works when your first loan still has competitive terms and you don't want to break a fixed rate or lose features. If your original loan is no longer suitable, investment loan refinancing for dentists might be the better option, allowing you to restructure everything at once and potentially improve your rate.

How Lenders Assess Rental Income on Multiple Properties

Lenders don't treat rental income as a dollar-for-dollar offset against your mortgage repayments. Most apply a shading factor, typically around 80%, to account for vacancy periods, maintenance costs, and collection risk. If your property generates $550 per week in rent, the lender will assess it as $440 per week of usable income.

The shading percentage varies between lenders. Some apply 70%, others go up to 100% in specific circumstances, particularly if you have a strong employment history and low overall debt. When you're applying for your second or third investment loan, the rental income from your existing properties is included in the serviceability calculation, but it's the shaded figure that counts. A property generating $28,600 annually in rent might only contribute $22,880 to your assessed income, and that difference affects how much you can borrow next.

Public health dentists often have stable employment, which works in your favour during this assessment. Lenders view permanent positions in the public sector as lower risk, and that can influence both the shading rate applied and the overall appetite to lend across multiple properties.

Fixed or Variable Rates Across a Multi-Property Portfolio

Splitting your loans across fixed and variable rates gives you flexibility without locking everything into one interest rate cycle. If you fix the loan on your first property at a lower rate and leave the second on a variable rate, you have the option to make extra repayments or pay down the variable loan faster without penalty.

Variable rates also allow you to access offset accounts and redraw facilities, which can be useful if you're holding cash for the next deposit or managing irregular income. Fixed rates provide certainty on repayments, which helps with budgeting when you're managing multiple mortgages, but they come with restrictions. If you want to sell, refinance, or pay off the loan early, break costs can apply.

When you're building a portfolio, the strategy that tends to work is fixing a portion of each loan to lock in some repayment certainty, and keeping a portion variable to maintain access to features and flexibility. A 50/50 split across each property is common, but the right structure depends on your income pattern, your plans for the next purchase, and your tolerance for rate movements.

The Impact of the 2026 Budget Changes on Established Properties

If you purchased an established investment property before 12 May 2026, the existing negative gearing and capital gains tax arrangements still apply to that property. Losses can be offset against your salary, and you'll receive the 50% capital gains tax discount when you sell.

For properties purchased after that date, the rules change from 1 July 2027. Losses on established residential properties can only be offset against rental income or capital gains from other residential property, not against your public health salary. If your investment property runs at a loss of $8,000 in a year, you can carry that loss forward and use it to offset future rental income or a capital gain when you sell, but it won't reduce your taxable income from employment in that year.

New builds remain unaffected. Investors purchasing newly constructed properties can still choose between the 50% capital gains discount or the new inflation-indexed method, and negative gearing deductions continue to apply in full. If you're planning to expand your portfolio after mid-2027, the tax treatment might shift your focus toward new construction or towards holding properties long enough that rental income exceeds expenses.

When Lenders Mortgage Insurance Becomes Unavoidable

Once you own one or two investment properties, your ability to avoid Lenders Mortgage Insurance on the next purchase depends on how much equity you can access and how much cash you have available. LMI is charged when your loan to value ratio exceeds 80%, and the premium increases as the LVR rises.

Some lenders offer LMI waivers for dentists on owner-occupied loans, but these waivers rarely extend to investment lending, and they almost never apply when you're purchasing your second or third investment property. If you're borrowing at 90% LVR on a $700,000 property, the LMI premium could be $20,000 to $30,000 depending on the lender and your deposit size.

The decision to pay LMI comes down to opportunity cost. If waiting another two years to save a larger deposit means missing a market cycle or delaying your third purchase, paying the premium might be the right call. The premium can be capitalised into the loan amount, so you're not required to pay it upfront, but it does increase your total debt and your ongoing repayments.

Structuring Loans Separately or Cross-Collateralising

When you own multiple properties, you can either keep each loan separate with its own security, or cross-collateralise them so one property acts as additional security for another. Cross-collateralisation can help you borrow more or avoid LMI, but it also means you can't sell or refinance one property without the lender's consent on the others.

Keeping loans separate gives you control. If you want to sell one property, you can do so without affecting the others. If you want to refinance to a different lender for a lower rate, you're not required to move everything at once. The downside is that you might need a larger deposit or pay LMI on each individual purchase if you don't have enough equity in a single property.

Most dentists building a portfolio prefer separate loans. It adds some complexity upfront, but it protects your flexibility later. If you're planning to hold properties long-term and have no intention of selling, cross-collateralisation might work, but it's worth understanding the restrictions before you commit.

How Your Portfolio Strategy Affects Loan Structure

Your timeline and exit strategy should shape the loan products you choose. If you're planning to hold multiple properties for 10 to 15 years and eventually transition some of them into retirement income, interest-only loans during the accumulation phase keep your repayments low and your serviceability high. You can switch to principal and interest later when your income increases or when you're no longer acquiring new properties.

If you're planning to sell one property to pay down another, variable rates give you the flexibility to make lump sum repayments without penalty. If you're planning to build a portfolio quickly over three to five years, structuring each loan with an offset account lets you park savings and rental income in a way that reduces interest without locking funds away.

Public health dentists often have predictable income growth over time, particularly if you move into senior or supervisory roles. Structuring your loans to match that income trajectory means your repayments become more manageable as your salary increases, rather than locking you into high repayments from day one. When you're working with a broker who understands the dental profession, the loan structure is built around your career stage and your specific plans, not around a generic investment formula. You can explore your options by reviewing investment loans for dentists to see how different lenders approach multi-property lending.

Call one of our team or book an appointment at a time that works for you. We'll walk through your current position, your plans for the next property, and the loan structures that give you the most flexibility without overcommitting your serviceability.

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