Maybe you've seen ads promoting "High CD Yields!" that offer rates significantly higher than other bank products. The promotion certainly grabs your attention, and that's what the promoters want. If you inquire about the certificate of deposit (CD), you may find yourself listening to a sales pitch and ultimately owning a very costly, potentially risky investment -- something much different than a CD.

FINRA is issuing this alert based on calls to its Securities Helpline for Seniors, (844) 57-HELPS (574-3577), involving promotions for higher-than-average CD rates. Some promotional rates may be legitimate and designed to bring in new bank or credit union customers. But others are marketing ploys in which the CD is used as the bait to try to sell you a different, high-commission product, such as a fixed or equity-indexed annuity. These annuities are complex investments that are not FDIC-insured.

Behind high-yield CD marketing ploys
Be wary if you respond to one of these CD promotions. Most require that you show up at an office and spend time with a salesperson, who will try to sell you an alternative product quite different from a CD. And whether you buy the CD or the alternative, you generally must commit to a sizable minimum purchase amount, such as $25,000.

Here's something else to be aware of: The yield you see advertised for the "high yield CD" generally includes a "bonus," which is an amount the salesperson would pay you in addition to the CD's actual average percentage yield, or APY. This "bonus" is essentially an incentive paid by the company or salesperson to you in order to get you in the door to hear the sales pitch for another product, like a fixed or equity-indexed annuity. 

If you say "no" to the other product being pitched, you can generally still buy a CD. However, the sales person will likely direct you to another bank where you will get the going, or average, rate. The sales person will then likely pay you the "bonus," the difference between the CD rate offered by the issuing bank and the promotional rate that got you in the door.

If you say "yes" to the alternative financial product being pitched -- typically an annuity -- you're apt to get a break on the cost of buying that product; the salesperson might work up some approximated discount that's close to the interest and bonus you would have "earned" from the CD. However, you are still likely to pay a hefty commission on the other, non-CD product.

As with any investment opportunity, always check BrokerCheck to see whether the person and the firm behind the offer are registered with FINRA. If not, check with your state insurance commission since the alternative investments are often actually insurance products.

The reality with these high-rate CD pitches is that you may end up walking out with a costly financial product that is not an FDIC-insured CD, and not risk-free.

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This article originally appeared at FINRA.