If you are juggling multiple credit card bills, you may benefit from the convenience of having one consolidated monthly payment. Consider all of the bills that the modern household pays (mortgage/rent, utilities, cell phone, cable, internet, etc.). Adding 5-10 monthly credit card bills can overwhelm your bill-pay. Multiple payments are due every week. Going on vacation or having a hectic few days can result in several late payments and hundreds of dollars in fees.
That is for you to decide. You do have to weigh the certainty that your credit score would take a hit (and some time to rebuild) against the advantage of a program that will allow you to make progress and pay off your debts. A bank loan is another option. You could check on the interest rate . . . but you should do this knowing you will not run up credit card balances again. Otherwise, you end up in an even worse situation than you are in now.
You're the best. My mom added me as an authorized user to a couple of her cards (when I was 12, and she never even told me about it), but they're at 99% utilization and have late payments! I'm still in the process of trying to get myself removed from those, and getting those accounts completely removed from my credit report, not just listed as closed accounts.
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With poor credit, you may not be able to get approved for new credit products like credit cards. Although you may still be able to take out an auto loan or a mortgage, you’ll pay a much higher interest rate because of your low credit score. Compared to a borrower with good credit, someone with poor credit can pay $50,000 more in interest on a mortgage. Over an entire lifetime, you could end up paying over $200,000 more in unnecessary interest just because of bad credit.