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Am I still building a credit score if I use my credit card like a debit card?
I always hesitate to provide an answer to "how does this affect my credit score?" questions, because the credit agencies do not publish their formulas and the formulas do change over time. And many others have done more reverse engineering than I to figure out what factors do affect the scores. To some extent, there is no way to know other than to get your credit score and track it over time. (The credit report will tell you what the largest negative factors are.) However, let me make my prediction. You have credit, you aren't using a large percentage of it, and don't have defaults/late payments. So, yes, I think it would help your credit score and would build a history of credit. Since this is so unusual, this is just an educated guess.