Here are some money mistakes even smart people make

Certified financial planner Jill Schlesinger has seen smart people make some pretty spectacular money mistakes.

One client who repeatedly refused to buy disability insurance later developed multiple sclerosis.

A doctor she knew put off writing a will and left behind a six-figure tax bill.

A technology company engineer balked at her suggestion to sell some of his stock options, only to watch their value and his retirement plans evaporate when the market plunged.

Schlesinger, a CBS News business analyst and author of "The Dumb Things Smart People Do With Their Money," acknowledged making financial missteps as well, including waiting for "just the right moment" to invest and missing a big jump in the stock market.

"We're emotional animals, not just rational ones," Schlesinger said. "So even otherwise intelligent people are stymied by their emotions — usually fear and greed — and their cognitive biases."

In fact, a whole field of economics is devoted to exploring how we make financial decisions — including the bad ones. Behavioral economics tries to pinpoint where our brains and emotions lead us wrong, as well as what we can do about it.

Overconfidence, excessive optimism and the conviction that the recent past will continue into the future mean many of us don't adequately protect ourselves.

The client who wouldn't buy disability insurance, for example, thought he wouldn't need it because he was healthy. The stock-option guy didn't want to sell a winning investment, not understanding how vulnerable he was to a downturn. The doctor just didn't want to think about dying.

The antidote to this kind of thinking is to stop trying to calculate the odds of something going wrong.

Focus instead on how much you or your loved ones have to lose if the worst happens.

If you can't easily absorb that loss, then buy the insurance, diversify your investments and write your will.

But we tend to make mistakes when we rush.

If you feel pressured to buy a product, sign up for a service or invest in something, take a step back.

Schlesinger recommended asking these questions before making investments, but they could easily apply to other financial decisions: How much will this cost? What are the alternatives? How easy is it to get my money out and what fees or penalties will I pay? What tax consequences will this carry for me? What's the worst-case scenario I face with this?

Most financial advisers aren't required to put your interests ahead of their own. They can sell you an investment that costs more or performs worse than an alternative, simply because it puts more money in their pocket.

This lack of a so-called fiduciary duty has persuaded many people that they are better off handling their own financial affairs.

You still would be smart, though, to seek out an expert if you're confronting a situation that is complex or out of the ordinary, she said.

• If the IRS is auditing you, you need a tax pro.

• If you are being sued by a creditor, you need a lawyer.

• If you're about to inherit a large sum — more money than you are accustomed to dealing with — you should talk to a fee-only financial planner who agrees in writing to put your interests first.

The more money you have, the more likely you are to face complex situations that require expertise you don't have.

Two areas that are particularly tricky are estate planning and retirement income strategies, including when to start Social Security and how to tap retirement funds.

The cost of getting an expert second opinion could be a fraction of what you would pay for a mistake.

"We all make dumb mistakes, but some of them can be costly — and life-altering," Schlesinger said.