Buying a home
Don't buy a house if you think you have to because you're getting to be older. Roberge often hears something like this from clients: "It's that time in my life where I should be buying a home because I'm wasting my money on rent." The problem is that you don't know if you'll make or lose money on a house. While buying a home can be a good investment, there are factors working against you. Trying to time the real-estate market is tough. And "historical averages of real estate over the last 100 years is 3% growth -- and if you tie in inflation, you really don't make any money," Roberge says.
Believing you must invest right after college
While some people think spending all your money is the way to be, others believe you have to immediately throw it into the stock market or a house to start making McDuck-sized pools of cash. More important than that, Roberge says, is "getting your month-to-month cash flow solidified before you think about where to invest." Once you have a good idea of what you're able to safely invest, you've got plenty of time to consider your options and figure out the right investment.
Not taking advantage of a benefits program
Since people in their 20s often are enrolled in a high-deductible health insurance plan (that health plan's motto is basically "I'm gonna live forever!"), it's a good idea to take advantage of a Health Savings Account, or HSA. It enables you to pay for medical expenses with pre-tax money, and you don't even have to use the money in one year, like you do with a Flexible Spending Account. As you get older, your medical needs typically increase, so there's a 99% chance you'll eventually use this money.
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Lee Breslouer is a senior writer for Thrillist, and made a bunch of these mistakes. Follow him to learning: @LeeBreslouer.