3 Ways You May Be Throwing Money Away Without Realizing It

How common financial decisions like buying a house or car can go terribly wrong.

How common financial decisions like buying a house or car can go terribly wrong.
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You aren't a dimwit. You're just stressed.

According to a recent study published in Science magazine, if you're poor and mismanage your money, you may be very capable of making good financial decisions. But you're trapped in a vicious circle: The inevitable problems that come with being poor are likely affecting your judgment, which means you're making bad decisions, which end up making you even more poor.

With that in mind, if you're financially struggling – or know someone who is – here are three ways people end up throwing money away when making common financial decisions: buying a house, buying a car and investing in a retirement plan. They're all generally good ideas, of course, but just because you're doing something smart doesn't mean you're doing it right.

Stretching to take out a mortgage. Few personal finance experts will say it's stupid to buy a house – but they will tell you that you can buy one too early in life, before you're financially ready. Many people also buy too big of a house.

"I can't tell you how many people I've seen get swept up in the romantic notion that they need to own a home or that they need to own a more expensive home, only to later regret it when they end up with a beautiful place but no money," says Scott Halliwell, a certified financial planner with USAA, a national financial services company based in San Antonio that mostly serves military members and their families.

[Read: 5 Financial Decisions That Sound Smart But Are Really Dumb.]

Halliwell says too many people try to buy a house before they've learned to budget. These red flags, he says, should alert you that you aren't financially ready: if you don't yet have an emergency fund, you can't save up for a sizable down payment (20 percent is standard) or you're trying to find another way to buy a house, such as taking on a high interest rate in place of having that down payment.

He has a point, especially considering that a house comes not only with a monthly mortgage that you'll likely be paying for the next 30 years – but also homeowners insurance, yard maintenance, appliances and furniture to buy and the inevitable home repairs. Most lenders say your house payment shouldn't be more than 30 percent of your income, so if you're searching for a way to buy a house that is going to be, say, 40 or 50 percent of your income, you might want to do some serious reconsidering.

Halliwell adds: "We always talk about how much money someone can save if they just stop drinking fancy coffee. The truth is, coffee doesn't do anywhere near the damage this move can."

Buying a too-expensive car. If you're not paying attention, the car you're buying may not seem all that expensive. The auto finance manager may suggest that instead of three years, you pay for six, and that $531 monthly payment for an $18,000 car decreases to $282, obscuring the fact that you'll end up paying far more in the long run, especially if you aren't getting a good interest rate.

For instance, if your car's interest rate is around 4 percent, which is average these days, paying the loan over six years instead of three means you'll pay $1,145 more just in interest. That might be worth it for the lower payments. But let's say you have bad credit and you're paying a high interest rate. Buying an $18,000 car at 18 percent (a typical interest rate if your credit score is, say, 550 and you're buying a used car) and paying it over three years means you'll shell out approximately $5,000 just in interest. Spreading the loan over six years means your interest alone will climb to $11,000. Your $18,000 car is actually a $29,000 car.

[Read: 6 Money-Saving Strategies That May Cost You In the Long Run.]

Of course, it can be easy to rush into buying a car, especially if your current vehicle is on life support. But not only should you make use of the many monthly loan payment calculators for car-buying on the Web, remember to research how a new or new-to-you car will affect your insurance and your auto's gas mileage.