Money Rules: When to Follow and When to Break

Financial Gurus Explore When to Bend Money Rules

Personal finance rules are designed to help people avoid costly mistakes and build wealth. However, sometimes sticking too closely to these guidelines can actually hurt your financial progress. Financial experts Brian Preston (CFP®, CPA) and Bo Hanson (CFA®, CFP®) recently discussed which common money rules can be bent or broken, and when it makes sense to do so. They emphasize that personal finance is deeply individual, meaning understanding when to deviate from standard advice is as important as knowing the rules themselves.

Car Buying: The 20/3/8 Rule

One popular guideline is the 20/3/8 car buying rule. This suggests putting at least 20% down on a vehicle, financing it for no more than 3 years, and keeping your total monthly car expenses (including insurance) below 8% of your gross monthly income. Sticking to this rule helps avoid costly car debt and excessive depreciation. However, there are times when breaking it might be wise. For instance, if you need a reliable car for a new job and can’t afford the upfront costs, or if a longer loan term at a very low interest rate allows you to invest the difference elsewhere, it might be justifiable. The key is to ensure the decision is strategic, not just a desire for a more expensive car.

Home Buying: The 3/5/25 Rule

Similarly, the 3/5/25 rule for home buying is a common benchmark. It recommends a down payment of at least 3%, a loan term of no more than 5 years (though this is often extended in practice), and keeping your total housing costs (including mortgage, taxes, and insurance) below 25% of your gross monthly income. This rule aims to prevent overspending on housing, which can strain finances. Exceptions might arise in high-cost housing markets where a larger down payment is nearly impossible, or if interest rates are exceptionally low, making a longer mortgage term more financially sensible. Still, keeping housing costs manageable is crucial for overall financial health.

Student Loans and Financing

When it comes to student loans, the first year of financing often presents unique choices. Generally, it’s advised to pay off loans as quickly as possible. However, if you are in a low-income situation right after graduation, making interest-only payments or exploring income-driven repayment plans might be a more practical approach. This allows you to manage your cash flow while you build your career. The experts also touched on the general principle of buying assets that appreciate, but caution against buying things that lose value quickly, like most cars.

Managing Debt and Savings

The advice on high-interest debt is usually straightforward: pay it off aggressively. This typically includes credit card debt, which often carries rates above 20%. Breaking this rule is rarely advisable, as the cost of carrying such debt can quickly outweigh potential investment gains. For emergency funds, the standard guideline is to have 3 to 6 months of living expenses saved. However, the amount needed can vary greatly depending on job stability and income sources. Someone with a very secure, predictable income might need less, while a freelancer with fluctuating income might require more.

Lump Sums and Income Savings

When receiving a lump sum, like an inheritance or bonus, the ‘Goldilocks Rule’ suggests not putting it all into one place immediately. Instead, splitting it between short-term needs, debt paydown, and long-term investments is often recommended. This balances immediate goals with future growth. The common recommendation to save 25% of your gross income for retirement is another guideline that may need adjustment. While a high savings rate is vital, individuals in different financial situations or life stages might need to temporarily save more or less, especially if dealing with significant debt or other financial priorities.

Credit Cards and Retirement Contributions

Credit card rules often focus on paying the balance in full each month to avoid interest. Using credit cards for rewards or convenience is fine, but carrying a balance is usually a costly mistake. Roth vs. Traditional IRA contributions depend on your current and expected future tax rates. If you expect to be in a higher tax bracket in retirement, Roth contributions (which are taxed now) are often better. If you expect to be in a lower bracket, Traditional contributions (which offer a tax deduction now) might be preferable.

The Financial Order of Operations

Finally, Preston and Hanson stressed the importance of following the Financial Order of Operations (FOO). This is a step-by-step plan for managing your money effectively. It prioritizes actions like saving for retirement, paying down debt, and investing in a specific sequence. Deviating from this order, such as investing heavily before establishing an emergency fund or paying off high-interest debt, can lead to significant financial setbacks. Understanding this sequence is key to building a solid financial foundation.

When to Seek Professional Help

The decision to hire a financial advisor is also a personal one. While many people can manage their finances independently, seeking professional guidance becomes more valuable as your financial situation becomes more complex, or as you approach major life events like retirement. An advisor can help you navigate intricate investment strategies, tax planning, and estate planning, ensuring you stay on track toward your long-term goals.

Market Impact

Understanding these financial rules and knowing when to break them empowers individuals to make more personalized and effective financial decisions. Rigid adherence without considering individual circumstances can lead to missed opportunities or unnecessary financial strain. For example, incorrectly applying the 20/3/8 car rule might mean delaying necessary transportation, impacting earning potential. Conversely, consistently breaking the 25% savings rule without a clear plan could jeopardize long-term retirement security. These decisions directly influence personal cash flow, debt levels, and investment growth, ultimately shaping an individual’s wealth-building journey.

What Investors Should Know

Investors should recognize that financial advice often comes with caveats. While rules like aggressive debt repayment and consistent saving are generally sound, context is critical. For instance, a low-interest environment might make carrying a mortgage for longer than 5 years (a deviation from the 3/5/25 rule) a rational choice if the funds saved can earn a higher return elsewhere. Similarly, the decision between Roth and Traditional retirement accounts hinges on future tax expectations. Investors must continuously evaluate their personal financial situation against standard guidelines, adapting strategies as needed to optimize their financial outcomes. Personal finance is not one-size-fits-all; flexibility and informed decision-making are paramount.

Source: All of Our Money Rules (And When to Break Them) (YouTube)