Opening a credit account for the sign-up bonus
Buy a sweater, and the clerk will offer a 15 percent discount if you sign up for a store credit card. Stroll through the airport, and an airline representative will pledge to give you 50,000 free miles in exchange for signature on a credit card application form.
That sign-up bonus may look great now, but the credit card company almost surely will do a “hard pull” on your credit report to check your creditworthiness. And when that happens, your credit score will dip.