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Do I pay a zero % loan before another to clear both loans faster?
Allen, welcome to Money.SE. You've stumbled into the issue of Debt Snowball, which is the "low balance" method of paying off debt. The other being "high interest." I absolutely agree that when one has a pile of cards, say a dozen, there is a psychological benefit to paying off the low balances and knocking off card after card. I am not dismissive of that motivation. Personal Finance has that first word, personal, and one size rarely fits all. For those who are numbers-oriented, it's worth doing the math, a simple spreadsheet showing the cost of the DS vs paying by rate.  If that cost is even a couple hundred dollars, I'll still concede that one less payment, envelope, stamp, etc, favors the DS method. On the other hand, there's the debt so large that the best payoff is 2 or 3 years away. During that time, $10000 paid toward the 24% card is saving you $2400/yr vs the $500 if paid toward 5% debt. Hard core DSers don't even want to discuss the numbers, strangely enough.  In your case, you don't have a pile of anything. The mortgage isn't even up for discussion. You have just 2 car loans. Send the $11,000 to the $19K loan carrying the 2.5%. This will save you $500 over the next 2 years vs paying the zero loan down. Once you've done that, the remaining $8000 will become your lowest balance, and you should flip to the Debt Snowball method, which will keep you paying that debt off.  DS is a tool that should be pulled out for the masses, the radio audience that The David (Dave Ramsey, radio show host) appeals to. They may comprise the majority of those with high credit card debt, and have greatest success using this method. But, you exhibit none of their symptoms, and are best served by the math. By bringing up the topic here, you've found yourself in the same situation as the guy who happens to order a white wine at a wedding, and finds his Mormon cousin offering to take him to an AA meeting the next day.  In past articles on this decision, I've referenced a spreadsheet one can download. It offers an easy way to see your choice without writing your own excel doc. For the situation described here, the low balance total interest is $546 vs $192 for the higher interest. Not quite the $500 difference I estimated. The $350 difference is low due to the small rate difference and relatively short payoffs. In my opinion, knowledge is power, and you can decide either way. What's important is that if you pay off the zero interest first, you can say "I knew it was a $350 difference, but I'd rather have just one outstanding loan for the remain time." My issue with DS is when it's preached like a religion, and followers are told to not even run the numbers. I wrote an article, Thinking about Dave Ramsey a number of years back, but the topic never gets old.