In our recent discussion, we unpacked why buying a house can put serious pressure on relationships - and why so many couples don’t make it through that first stretch. It all ties back to a simple but powerful idea from Charlie Munger: “There are only three ways a smart person goes broke - ladies, liquor, and leverage.”
This episode zooms in on leverage - and how taking on a large mortgage can quietly shift the dynamic between two people.
Leverage: The Hidden Pressure
Leverage is what allows people to get into property but it’s also what creates stress when things don’t go to plan.
As discussed, many buyers made decisions during low interest rate periods, assuming those conditions would hold. That’s where things can unravel. Interest rates move, repayments increase, and suddenly what felt comfortable becomes tight.
In New Zealand, long-term interest rates tend to sit around 5.5% to 6%, so anything below that can feel manageable – until it isn’t.
That financial pressure doesn’t stay contained to spreadsheets. It shows up in conversations, stress levels, and ultimately, relationships. As shared in the episode, a significant portion of first home buyer couples separate within months of purchasing – a reflection of just how intense that shift can be.
When Money Gets Complicated
It’s not just the mortgage itself – it’s everything wrapped around it.
First home buyers often:
- Pull funds from KiwiSaver
- Receive financial help from family
- Stretch themselves to secure a property
When a relationship ends, those contributions don’t always stay separate. Without the right structure, they’re typically treated as shared property and divided accordingly.
That’s where things can become messy and expensive. Some couples are forced to sell quickly, sometimes at a loss, turning what was meant to be a step forward into a financial setback.
The Conversations People Avoid
A big issue is that most couples simply don’t plan for this upfront.
There’s often no formal agreement in place not because people don’t care, but because it feels unnecessary or uncomfortable early on. But when there’s a difference in contributions, or family money involved, that lack of clarity can create real problems later.
Speaking with a lawyer and setting expectations early can remove a lot of that uncertainty. It might not be an easy conversation, but it’s far easier than dealing with the consequences down the track.
Debt and Decision-Making
Taking on a large mortgage doesn’t just impact your bank account it shapes your future decisions.
As discussed, a significant portion of income ends up going toward repayments, which can limit:
- Flexibility
- Risk-taking
- Opportunities like starting a business or investing elsewhere
Instead of creating freedom, higher property costs can absorb time, capital, and energy – leaving people feeling stuck, even as their income grows.
Key Takeaways
- Leverage can amplify both opportunity and stress
- Interest rate assumptions can quickly become outdated
- Financial pressure is a major contributor to relationship strain after buying a home
- KiwiSaver withdrawals and family contributions can be split if not protected
- Lack of upfront agreements can lead to costly outcomes
- Distressed sales after breakups can result in significant financial losses
- High mortgage debt can limit long-term flexibility and decision-making
Next Steps
If you’re thinking about buying a home or structuring your finances, the right advice upfront can save a significant amount of stress later – speak to the Lighthouse Mortgages team to plan it properly.
If you’d like to watch more, check out this other episode below.
For a no obligation discussion to see how we can help you on the path to wealth, please contact us.
Disclaimer:
The information in this article is general information only, is provided free of charge and does not constitute professional advice. We try to keep the information up to date. However, to the fullest extent permitted by law, we disclaim all warranties, express or implied, in relation to this article – including (without limitation) warranties as to accuracy, completeness and fitness for any particular purpose. Please seek independent advice before acting on any information in this article.
