A PLUS loan is taken out by the parent as the primary borrower, so your mother wouldn't be able to remove her name from the loan. Before a Federal Plus loan is given, a credit check is done, but it's only to make sure there's no adverse credit history. If there isn't, the loan doesn't require a co-signer. If there is, a co-signer who doesn't have an adverse credit history is required.
With private student loans, the lender will often permit the release of the co-signer from the loan after a series of on-time loan payments. It's common that you have to meet 24 monthly payments, but I've seen lenders require 36 months of on-time payments.
If it is possible to remove your mother as a co-signer on your student loan, it helps her by increasing her capacity for new credit. It shouldn't have much impact on your credit score if you are the other responsible party on the loan. A credit score is based on the information in your credit report. Nothing has changed in your credit report, so your score shouldn't change. You were responsible for the payments. You still are. And the payment history is in your credit report.
Taking out additional student loans to complete a professional certificate program will lower your credit score by tying up your credit capacity and by concentrating your debt in a particular type of borrowing. The following graphic shows how the information in your credit report determines your credit score.
Elements of your credit score
Once you get your student loans, the credit score question becomes: Can I finance my other life goals given my existing level of student loans? Qualifying for car loans or mortgages can become problematic if you're carrying large student loan balances.
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