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7 Personal Finance Myths That Are Wrecking Your Budget

These outdated beliefs sound smart, but they could be silently draining your wallet. Here's what to stop believing — and what to do instead.

MTN Staff

Published May 9, 2025

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We all want to be sensible with our money. But what if the “rules” you’ve been following are actually sabotaging your budget?

Personal finance is packed with conventional wisdom that hasn’t aged well. From outdated advice about credit cards to oversimplified savings goals, these myths can lead you into habits that hurt more than they help.

Looking to build better habits? One way to start is by making your money work harder for you — even while it sits. For example, SoFi Checking is offering 3.8% interest on emergency savings, plus a potential $300 signup bonus. (May change without notice.)

Here are seven budget-wrecking myths you need to ditch — fast.

Myth 1. Credit cards are always bad

Woman holding credit cards
Rawpixel.com / Shutterstock.com

This one has been floating around forever, but it’s only half-true. Yes, carrying high-interest debt on a credit card can wreck your finances — but using credit responsibly can actually help you.

Paying your balance in full every month builds credit history, improves your score, and often comes with rewards or cashback. The trick is using your card like a debit card: only spend what you already have, and pay it off every time.

Avoiding credit cards altogether can leave you without a credit footprint, which may make renting, getting a mortgage, or even landing a job harder down the road.

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Myth 2. Renting is just throwing money away

Couple renting an apartment
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Not true. Renting can be a smart financial decision—especially if buying means stretching your budget, draining your savings, or taking on a high-interest mortgage.

Homeownership comes with hidden costs: maintenance, property taxes, insurance, and interest. Renting gives you flexibility, predictable monthly expenses, and time to build your financial base before taking the plunge.

If you’re already a homeowner, renting isn’t the only way to free up your finances. You might be sitting on a powerful source of cash without even realizing it.

Did you know that Americans have $30 trillion in untapped home equity? Hometap lets homeowners unlock up to $600K of their equity without monthly payments or personal liability.

Myth 3. You must save 20% of your income

Happy saver holding a piggy bank
Jason Stitt / Shutterstock.com

Saving 20% is a great goal — but it’s not a one-size-fits-all rule. If you’re working a lower-paying job, managing student loans, or living in a high-cost city, saving 20% might be unrealistic right now. And that’s okay.

What matters most is saving something consistently. Even starting with 1% or $25 a month creates the habit — and you can increase over time. Budgeting is personal, and your savings rate should reflect your reality, not a rigid standard.

Need help finding flexible ways to save or fund a major expense? Explore financial solutions here that fit your lifestyle and goals.

Myth 4. I don’t make enough to budget

Couple with empty pockets
Prostock-studio / Shutterstock.com

Actually, the less you make, the more important budgeting becomes. Without a plan, even a small income can vanish through spontaneous spending, forgotten subscriptions, or unnecessary fees.

A budget doesn’t have to be a spreadsheet masterpiece. A simple list of what comes in and what goes out each month is enough to start. It helps you see where your money is going — and gives you a chance to redirect it toward what matters.

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Myth 5. All debt is bad

Women upset about a high bill
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Not all debt is created equal. Sure, high-interest credit card debt and payday loans are budget busters. But some debt—like a mortgage, student loans, or a low-interest auto loan—can be strategic if managed wisely.

Good debt helps you acquire assets or increase your earning power. The key is knowing your limits, shopping for the best rates, and not borrowing more than you can realistically repay.

If you’ve got at least $100,000 in investments, it might be time to speak with an expert. SmartAsset matches you with vetted fiduciary advisors in under five minutes.

Myth 6. If I can afford the payments, I can afford the purchase

Senior man pondering a question
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This myth has trapped more people in financial quicksand than almost any other. Just because the monthly payment fits doesn’t mean the purchase is affordable.

What’s the total cost over time? Are you sacrificing future goals to make that payment today? Will it strain your emergency fund?

Consider this: unexpected costs can throw even a “manageable” budget off balance. Car repair bills, for example, aren’t what they used to be.

One auto shop told Consumer Reports their average job rose from $1,600 a decade ago to $4,000 today. Endurance gives you access to thousands of ASE-certified repair shops and pays the bill upfront, so you’re only responsible for the deductible. Get a free quote today!

Myth 7. I’ll save whatever’s left at the end of the month

Businesswoman with laptop and calculator working in an office on financial estimates or tax returns
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Spoiler alert: there’s rarely anything left.

Waiting until the end of the month to save almost guarantees it won’t happen. Life fills in the gaps — takeout, last-minute buys, forgotten bills. Instead, treat savings like a bill and pay yourself first.

Even a small auto-transfer on payday makes a big difference over time. The best budgets build saving into the plan — not the leftovers.

Want your savings to grow faster? SoFi IRA helps you take advantage of compounding interest with matched contributions. The longer you wait, the less you’ll earn. Get started today.

Bust the myths, fix your budget

Successful Black businesswoman
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The worst thing about personal finance myths? They sound helpful — until they quietly drain your wallet and delay your goals.

Let go of the advice that doesn’t serve you. Today’s financial wins come from flexibility, awareness, and smart habits. You don’t need perfect income, perfect timing, or perfect math. You just need to question the myths — and build your own money rules that actually work.

And when you’re ready to plan long-term, WiserAdvisor is a free service that can match you with a trusted financial advisor in your area. If you have over $100,000 in investments, consider speaking with a professional to help guide your strategy.

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