A check is a check is a check, unless it's not. A check that draws from your bank account and a check from you credit card are way different.
Credit card "convenience" checks are used for balance transfers, to pay yourself cash or other bills. The company mails them to you. And if you use them, you need to be prepared to pay for the convenience.
If you use the checks for balance transfers or cash advances be prepared for a 3 to 5% fee -- even if your card has a 0% APR. Here's a good point to keep in mind from Nerdwallet; the clock starts on interest rates as soon as you use the cash, as opposed to the grace period you usually get if you pay your credit card off by the end of the month.
If you use the check to buy something the product won't have the same warranty protection and other perks of using your credit card.
Some banks send balance transfer credit card offers in the mail at least once a month. But you can opt out of getting these marketing materials by asking the credit card issuer to stop mailing them. To opt out contact the the customer service department of your credit card. Tell them you are not interested in the offer and ask that the materials be no longer sent to your home.
If you keep receiving these checks in the mail but have no plans to use them, always shred the checks -- don't simply throw them away.
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