Assumptions drive outcomes

Read Full Blog Here

Financial modelling has become a powerful sales tool across the wealth industry, especially in property investing. In this episode, Stuart unpacks why slick projections and long-term forecasts can look compelling, yet still lead investors in the wrong direction.

He explains a simple but critical truth: models don’t reveal the future, they reflect assumptions. And when the person building the model also benefits if you transact, those assumptions deserve serious scrutiny. He explores how optimistic growth rates, understated costs, and smooth “straight-line” returns can quietly transform modelling from a decision tool into a persuasion tool.

You’ll learn why sequence risk matters more than most projections admit, how rental and cash-flow assumptions are often overstated, and why strategies that rely on early growth are inherently fragile. Stuart also breaks down execution risk, borrowing capacity, credit policy changes, interest-only rollovers, and why many strategies fail not on paper, but in practice.

Finally, he explains how high-quality modelling should really be used: stress-tested, conservative, evidence-based, and compared against credible alternatives. If you’re presented with a model that promises certainty, this episode will help you ask the right questions and avoid buying an outcome that only works in a spreadsheet.

My new book out in mid-2026: To join the pre-order waitlist and get a bonus. More info go to: https://prosolution.com.au/book-preorder-bonus

Do you have a question for the podcast? Email us at questions@investopoly.com.au.

If you're interested in working with our team and me, discover how we can work together here: https://prosolution.com.au/family-office-services

If this episode resonated with you, please leave a rating on your favourite podcast platform.

Subscribe to my weekly blog: https://prosolution.com.au/stay-connected

IMPORTANT: This podcast provides general information about finance, taxes, and credit. This means that the content does not consider your specific objectives, financial situation, or needs. It is crucial for you to assess whether the information is suitable for your circumstances before taking any actions based on it. If you find yourself uncertain about the relevance or your specific needs, it is advisable to seek advice from a licensed and trustworthy professional.