All of Our Money Rules (And When to Break Them)
TL;DR
Financial advisors Brian Preston and Bo Hanson outline their core money rules for cars, homes, and student loans, explaining the mathematical guardrails that protect wealth while detailing specific scenarios where breaking these rules makes sense for high-income professionals or those in high cost-of-living areas.
🚗🏠 Major Purchase Guidelines 4 insights
20/3/8 Car Buying Rule
Put 20% down, finance for maximum 36 months, and keep payments under 8% of monthly gross income to avoid driving away your wealth, especially with the average new car now costing $50,000 while median individual income sits at $45,000.
Breaking Car Rules
Pay cash when possible, or adhere strictly to 2/3/8 if you need transportation to reach your job but lack savings, though never use this to justify luxury vehicles.
3/5/25 Home Buying Rule
Put 3% down, plan to stay 5+ years, and limit housing costs to 25% of monthly gross income to prevent becoming house-rich and life-poor while maintaining savings margin.
Breaking Home Rules
Stretch housing budget to 30% if you have high income trajectory (engineers, doctors, attorneys) or live in high-cost coastal cities where 25% is impossible, provided you compensate with lower transportation costs.
🎓 Education Debt Strategy 3 insights
First Year Salary Cap
Limit total student loan borrowing to your anticipated first-year post-graduation salary to prevent carrying debt for the average 20-year repayment period.
Student Loan Crisis Statistics
44% of Gen Z carries student loans, 14% owe over $50,000, and 24% of responsible adults doubt they'll ever repay them, often because 70% of the general population doesn't work in their field of study.
Breaking Education Rules
Exceed the salary cap only for specialized degrees (medical, legal) with high probability of outsized future income, while keeping living expenses minimal to avoid exacerbating debt.
📈 Investment & Debt Prioritization 3 insights
Always Be Buying
Continuously invest regardless of market conditions to remove emotion from wealth building and systematically capitalize when others panic sell.
When to Pause Investing
Break the always-buy rule if you haven't completed earlier financial priorities like employer 401(k) matching, high-interest debt elimination, or emergency fund construction.
High Interest Thresholds
Accept car loans up to 10% interest in your 20s if strictly following the 2/3/8 structure, but avoid 0% credit card teaser rates that trap consumers into long-term high-interest debt.
Bottom Line
Money rules provide essential guardrails against wealth destruction, but strategic exceptions are warranted when you have verified high income trajectory, live in unavoidable high-cost areas, or need essential transportation to begin earning—provided you maintain savings margin and don't use exceptions to justify luxury consumption.
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