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Good financial advice leaves you better off. Bad advice does the opposite and may enrich someone else at your expense.

Here are some areas where you need to be particularly careful to seek out good advice, since bad advice can be so costly:

Investing

Most financial advisers aren’t required to put your best interests first. They’re allowed to recommend investments that cost more or perform worse than available alternatives.

Why would they do that? Because the inferior investments pay them or their employers more than the better ones.

This kind of conflicted advice takes a heavy toll. White House economic advisers estimated in 2015 that conflicted advice cost Americans $17 billion a year and resulted in losses of one percentage point per year for affected investors.

One percentage point may not seem like a lot, but over time it adds up. Someone who contributes $5,000 a year to a retirement fund could have nearly $1 million at the end of a 40-year working career if the average net return is 7%. If higher costs reduce the return to 6%, the nest egg would total about $775,000.

Look for advisers who are fiduciaries, meaning they are required to put your interests ahead of theirs. You might also consider a robo-advisory service, which uses computer algorithms to design investment portfolios at low cost.

Claiming Social Security

More than one-third of Social Security recipients start benefits at the earliest opportunity, which is age 62. Fewer than 4% wait until age 70, when benefits max out.

But starting Social Security at 62 can cost people up to $250,000 in lost benefits, according to a study for the National Bureau of Economic Research. [Ed. note: Of course, there are times when it makes sense to claim at 62, depending on a person’s particular situation.]

Unfortunately, many people don’t get good advice before they claim. Even Social Security itself may not be a good source, since its representatives have been known to steer people wrong.

Social Security claiming calculators, such as the free one at AARP.org, can help you determine the lifetime impact of starting benefits later.

If you have substantial retirement savings, you also should consider consulting a fiduciary financial planner about the best ways to coordinate Social Security claiming with retirement plan withdrawals.

Managing your credit scores

You may have heard that you don’t need to worry about your credit scores because they’re not important or because they’ll be good as long as you handle money responsibly.

Neither is true, and having bad scores can cost you tens of thousands of dollars over your lifetime.

People with credit scores of around 720, for example, could expect average mortgage interest rates of 3.67% on a 30-year, $300,000 mortgage, according to Informa Research Services, Inc. The monthly payment would be about $1,374.

People with 620 scores, on the other hand, average 5.03% or $1,616 a month. That’s a difference of $86,891 over the life of the loan.

Similarly, someone with 720 scores could expect to pay $5,000 less on a six-year, $30,000 car loan than someone with 620 scores.

Higher interest rates aren’t the only cost. Bad credit also can cause you to pay more for insurance, make it harder to get an apartment and even cause you to miss out on the best cellphone promotions.

The best advice: Learn how credit scores work and monitor at least one of yours, so you can address problems before they cost you a fortune.

—AP/NerdWallet