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Smartest Place to Put Tax Refund
Welcome to Money.SE. Your question is similar to a number of others. The "How do I pay my debt down?" and "How do I invest extra money?" is a bit of a continuum since there's no consensus than one should pay off the last cent of debt before investing.  Oversimplify it for me: the correct order of investing offers a good look at this. You see, Pete's answer on your question is perfectly fine, but, since you make no mention of, say, a matched 401(k), I'd suggest that any answer to a question like yours should first take a step back and evaluate the bigger picture. A dollar for dollar matched 401(k) beats paying off even an 18% credit card.  Absent any tangents, any thought of investing, saving for anything else, etc, my answer is simple, line up the debt, highest interest rate to lowest. Keep in mind the post-tax rate, i.e. a 6% student loan you can deduct, is an effective 4.5% if you are in the 25% bracket.