What is a Monte Carlo simulation in property investing?

Monte Carlo simulation runs thousands of possible future scenarios by randomly varying key inputs like growth rates, interest rates, vacancy, and rental yields within realistic ranges. Instead of giving you one fixed projection, it shows you a probability distribution of outcomes. You might see that in 80% of scenarios your portfolio is worth between $2 million and $4 million after 20 years, which is far more useful than a single number that assumes everything goes perfectly.

How accurate are property portfolio simulations?

No simulation can predict the future. What it can do is show you the range of likely outcomes based on historical patterns and the assumptions you provide. The value is not in the exact number but in understanding the probability distribution: how likely is a good outcome, how bad could a bad outcome get, and how sensitive is your plan to changes in growth rates or interest rates. It is a tool for better decision-making, not a crystal ball.

What inputs does the Presm portfolio simulator need?

You will enter details about your current properties or planned acquisitions, including purchase price, deposit, loan terms, rental income, and holding costs. The simulator also lets you set assumptions for growth rates, rental yield changes, interest rate scenarios, and your acquisition timeline. You can model adding properties over time to see how your portfolio evolves with each new purchase.

Can I simulate buying multiple properties over time?

Yes. The simulator lets you model an acquisition strategy where you add properties at different intervals. You can set when you plan to buy, how much deposit you will have, and what kind of property you are targeting. This is one of the most powerful features because it shows how equity from earlier purchases helps fund later ones through refinancing and equity recycling.

Do I need financial experience to use the simulator?

Not at all. The simulator is designed for everyday property investors, not quants. You enter straightforward numbers like purchase price, rent, and loan details. Presm handles the complex modelling behind the scenes and presents results in clear, visual charts. If you can fill out a property listing, you can use the simulator.

Stop guessing. Simulate 10,000 outcomes for your portfolio.

One projection is just a guess. Monte Carlo simulation runs thousands of scenarios — varying growth rates, interest rates, vacancy, and yields — to show you the range of outcomes your strategy could actually produce.

Monte Carlo

Simulation engine

10,000+

Scenarios per run

Probability

Bands shown

Multi

Property support

How this is different

Every other property calculator gives you one line on a chart and calls it a plan. Presm runs thousands of simulations using realistic distributions of growth, interest rates, and vacancy to show you probability bands: best case, worst case, and the most likely outcome in between. That is the difference between hoping and planning.

What the simulator covers

Probability analysis

See the 25th, 50th, and 75th percentile outcomes. Know how likely each scenario actually is.

Multi-property modelling

Add properties over time. See how your second and third purchase changes the probability distribution of your portfolio.

Growth scenarios

Model different growth assumptions. See how a 1% change in average annual growth compounds over 20 years.

Risk assessment

Understand your downside. What does the 10th percentile look like? Can you sustain it? The simulator shows you.

Why one projection is not enough

Most property calculators give you a single projection: "If growth is 5% per year, your property will be worth X in 20 years." That ignores reality. Growth is not 5% every year. Some years it is 12%, some years it is minus 3%. Interest rates move. Tenants leave.

Monte Carlo analysis acknowledges this uncertainty. It randomly samples from realistic distributions and runs the full calculation thousands of times. Each run produces a different outcome. Together, they show you what is likely, what is possible, and what is unlikely.

What inputs matter most

Growth rate assumptions have the biggest impact on long-term outcomes. Even a 1% difference in average annual growth compounds dramatically over 20 years. Use conservative assumptions and let the simulation show you the upside.

Acquisition timing is often underestimated. Buying your second property three years earlier or later can shift your 20 year outcome by hundreds of thousands of dollars because of the compounding effect.

Frequently asked questions

: Monte Carlo simulation runs thousands of possible future scenarios by randomly varying key inputs like growth rates, interest rates, vacancy, and rental yields within realistic ranges. Instead of giving you one fixed projection, it shows you a probability distribution of outcomes. You might see that in 80% of scenarios your portfolio is worth between $2 million and $4 million after 20 years, which is far more useful than a single number that assumes everything goes perfectly.
: No simulation can predict the future. What it can do is show you the range of likely outcomes based on historical patterns and the assumptions you provide. The value is not in the exact number but in understanding the probability distribution: how likely is a good outcome, how bad could a bad outcome get, and how sensitive is your plan to changes in growth rates or interest rates. It is a tool for better decision-making, not a crystal ball.
: You will enter details about your current properties or planned acquisitions, including purchase price, deposit, loan terms, rental income, and holding costs. The simulator also lets you set assumptions for growth rates, rental yield changes, interest rate scenarios, and your acquisition timeline. You can model adding properties over time to see how your portfolio evolves with each new purchase.
: Yes. The simulator lets you model an acquisition strategy where you add properties at different intervals. You can set when you plan to buy, how much deposit you will have, and what kind of property you are targeting. This is one of the most powerful features because it shows how equity from earlier purchases helps fund later ones through refinancing and equity recycling.
: Not at all. The simulator is designed for everyday property investors, not quants. You enter straightforward numbers like purchase price, rent, and loan details. Presm handles the complex modelling behind the scenes and presents results in clear, visual charts. If you can fill out a property listing, you can use the simulator.

Simulate your portfolio growth

Thousands of scenarios. Probability-weighted outcomes. Real numbers, not guesses.