Some financial advice is so widely repeated that it feels like fact. People pass it on confidently — parents to children, friends to friends — and it shapes real decisions: whether to rent or buy, how to use a credit card, whether to start saving this year or wait.
Some of it is just wrong. Here are six of the most costly myths, with the actual evidence.
Myth 1: “Renting Is Throwing Money Away”
The myth says: when you rent, you have nothing to show for it at the end of the month. When you own, you’re building equity. Renting is therefore a waste.
The reality: Owning a home costs far more than the mortgage payment. Property taxes, homeowner’s insurance, maintenance (budget 1–2% of the home’s value per year), HOA fees if applicable, and — in the early years of a mortgage — the majority of each payment going to interest rather than equity. Add the opportunity cost of the down payment: $40,000 sitting in a home equity instead of invested in the market for 10 years at 7% would have grown to roughly $78,700.
In high-cost cities — San Francisco, New York, Boston — the math often clearly favors renting and investing the difference. In markets where buying is cheap relative to renting, ownership can build wealth effectively. But the comparison isn’t “equity vs. nothing.” It’s the full cost of ownership vs. rent plus what you do with the difference.
The rule also assumes you stay long enough to benefit. Transaction costs on buying and selling a home (agent commissions, closing costs) run 8–10% of the purchase price. On a $400,000 home, that’s $32,000–$40,000 in friction. If you move within 3–4 years, you often haven’t built enough equity to offset those costs.
Renting while investing the difference is a legitimate wealth-building strategy. It’s not throwing money away.
Myth 2: “You Need a Lot of Money to Start Investing”
The myth says: investing is for people who have money. You should wait until you have a lump sum — $5,000, $10,000 — before starting.
The reality: Many index funds now have $0 minimum investment requirements. Fractional shares let you invest in any stock or fund for as little as $1. Roth IRAs can be opened with any amount above $0 at most brokerages.
More importantly: the waiting cost is enormous. The most powerful variable in compound growth is time. $50/month invested starting at age 25 at a 7% average return grows to about $130,000 by age 65. Waiting until 35 to start the same $50/month leaves you with $61,000 — less than half, despite only missing 10 years.
There’s no minimum to start. There is a significant cost to waiting.
For an illustration of how compound interest works over time, see How Compound Interest Works.
Myth 3: “Carrying a Credit Card Balance Builds Credit”
This myth is extremely widespread and completely false.
The myth says: to build a good credit score, you should carry a small balance — don’t pay it off in full, because that shows you’re “using” the credit.
The reality: Your credit score does not know whether you carried a balance and paid interest or paid your balance in full. The scoring models (FICO, VantageScore) look at your credit utilization rate — the percentage of available credit you’re using — and your payment history. Neither cares whether you paid interest.
Carrying a balance at 20%+ interest produces exactly zero credit benefit. It costs you real money in interest charges for a benefit that does not exist.
The correct credit-building behavior: use your credit card regularly (to show activity), keep your utilization below 30% of your limit, and pay the full balance every month. You build credit and pay no interest.
Myth 4: “A Tax Refund Is a Bonus”
The myth says: getting a large tax refund is good news — a windfall in the spring.
The reality: A tax refund means you overpaid the IRS throughout the year and are now getting your own money back. The IRS held it, interest-free, and returned it. You gave the government an interest-free loan.
If you received a $3,000 refund, you effectively had $250/month in your paycheck that should have been yours — that you didn’t have access to all year. Had it been in a high-yield savings account at 4.5% APY, it would have earned roughly $75–$90 in interest over the year. Small, but it’s your money.
The fix: update your W-4 with your employer to adjust your withholding so you come out closer to even at filing. The IRS has an online withholding estimator that makes this straightforward. The goal isn’t to owe a large amount — it’s to neither significantly overpay nor underpay.
Myth 5: “I’ll Start Saving When I Make More Money”
The myth says: your current income is too tight to save meaningfully. Once you make more, you’ll start then.
The reality: This almost never happens. When income rises, expenses rise with it — the phenomenon called lifestyle creep means that the higher income creates a new baseline of spending, and saving still feels hard. See Lifestyle Creep: What It Is and How to Prevent It for how this plays out.
The compound interest math makes the delay extremely costly. Every year you postpone investing is a year of potential growth lost permanently. If you start investing $3,000/year at age 25, you’ll have roughly $750,000 by 65 at a 7% return. Start at 35: roughly $375,000. A 10-year delay costs you $375,000 — even though you invested for 30 of those years.
The solution isn’t to wait for the right income. It’s to automate a small amount — even $25/month — immediately. The habit matters more than the amount when you’re starting. When income increases, you increase the contribution.
Myth 6: “Debt Is Always Bad”
The myth says: any debt is a failure. You should have no debt and avoid borrowing entirely.
The reality: Debt is a financial tool. Like all tools, it’s good or bad depending on how it’s used.
A mortgage at 3–4% that allows you to build equity in an appreciating asset over 30 years is a different instrument from a credit card at 24%. A student loan at 5% that genuinely increases your earning power over a career may produce a strong return on investment — though this varies significantly by field and school cost. A small business loan that funds a venture with strong cash flow creates value.
The meaningful distinction is: does the debt cost more than the value it creates? High-interest consumer debt — credit cards, payday loans — almost always costs more than it creates. Low-interest debt tied to assets that appreciate or income that grows often doesn’t.
Avoiding all debt at any cost can lead to missing opportunities that mathematically make sense. Treating all debt as equivalent ignores the critical variables of interest rate and what the borrowing produces.
The evidence-based view: eliminate high-interest debt aggressively. Evaluate lower-interest debt by what it enables and what it costs.
Most of these myths survive because they contain a kernel of truth — equity is real, using credit matters, income matters for saving. The damage comes from oversimplifying. For more on the psychology behind why we accept financial beliefs uncritically, Why We Make Bad Money Decisions covers the cognitive patterns worth knowing. And for a practical look at the specific mistakes that follow from these myths, The 7 Most Common Money Mistakes has concrete fixes for each.