Paying the Minimum on Credit Cards
It feels responsible. You’re paying your bill, right?
But paying the minimum on a $5,000 credit card balance at 24% APR means you’ll pay $7,200 in interest alone — and it takes 22 years to pay off.
Twenty-two years. For a $5,000 balance.
Even adding $50 extra per month cuts that to 4 years and saves you $5,800 in interest. The minimum payment is designed to maximize the bank’s profit, not help you get out of debt.
Not Negotiating Your Salary
The biggest money mistake most people make happens before they even start a job.
Not negotiating your starting salary costs you an estimated $500,000-$1,000,000 over your career. Every future raise, bonus, and retirement contribution is based on that initial number.
A $5,000 higher starting salary, with 3% annual raises, means $95,000 more over 20 years — without doing anything differently.
73% of employers expect candidates to negotiate. Yet 55% of workers never do. Don’t leave money on the table.
Ignoring Your 401(k) Match
If your employer matches 401(k) contributions and you’re not maxing the match, you’re literally declining free money.
A typical match is 50% of your contribution up to 6% of salary. On a $60,000 salary, that’s $1,800/year in free money.
Over 30 years at 10% returns, that $1,800/year match grows to $296,000.
That’s almost $300,000 — money your employer was willing to give you — that most people leave on the table because they ‘can’t afford to contribute.’ You can’t afford NOT to.
Keeping Too Much Cash in a Checking Account
Money sitting in a checking account earns 0.01% interest. In 2026, with inflation at 3.5%, that money is actively LOSING 3.49% of its purchasing power every year.
$20,000 in checking loses $698 in real value annually.
Keep 1-2 months of expenses in checking. Move the rest to a high-yield savings account earning 4.5-5% APY. That same $20,000 now earns $900-$1,000/year instead of losing value.
It takes 10 minutes to open an account. Those might be the most profitable 10 minutes of your life.
Buying New Cars (and Financing Them)
A new car loses 20% of its value the moment you drive it off the lot. After 5 years, it’s worth about 40% of what you paid.
Buy a reliable 2-3 year old car instead and save $8,000-$15,000 immediately. Finance for no more than 48 months.
Better yet? Drive a paid-off car and invest the $500/month you would’ve spent on payments. After 10 years, that’s $97,000 in investments vs. a car worth $8,000.
The wealthiest people drive the most boring cars. There’s a reason for that.
Not Having a Financial Plan
Here’s the most expensive mistake of all: winging it.
People without a written financial plan save 50% less than those with one. Not because they earn less — because they don’t have direction.
A plan doesn’t need to be complicated. One page with 4 numbers:
1. Monthly income 2. Monthly expenses 3. Monthly savings target 4. Net worth goal for the year
That’s it. People who write down financial goals are 42% more likely to achieve them. The plan isn’t the hard part — starting is.