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Do I pay a zero % loan before another to clear both loans faster?
This is a very complicated thing to try to do. There are many variables, and some will come down to personal taste and buying habits. First you need to look at each of the loans and find out two very important things.  Some times you pay a huge penalty for paying off a loan early. Usually this is on larger loans (like your mortgage) but it's not on heard of in car loans. If there is a penalty for early re-payment, then just pay off on the schedule, or at least take that penalty into consideration. Another dirty trick that some banks do is force you to pay "the interest first" when making a early payment.  Essentially this is a penalty that ensures you pay the "full price" of the loan and not a lessor amount because you borrowed for less time. The way it really works is complicated, but it's not usually to your benefit to pay these off early either. These usually show up on smaller loans, but better look for it anyway.  Next up on the list you need to look at your long term goals and buying habits. When are you going to re-model your kitchen. You can get another loan on the equity of the house, it's much harder to get a loan on the equity of a car (even once the car is paid off). So, depending on your goals you may do better to pay extra into your mortgage, then paying off your other loans early.  Also consider your credit score. A big part of it is amount of money remaining on credit lines/total credit lines. Paying of a loan will reduce your credit score (short term). It will also give you the ability to take out another loan (long term).   Finally, consider simplification of debtors. If something goes wrong it's much easier to work with a single debtor, then three separate debtors. This could mean moving your car loans into your mortgage, even if it's at a higher interest rate, should the need arise. Should you need to do that you will need the equity in your home.  Bonus Points: As others have stated, there are tax breaks for people with mortgages in some circumstances. You should consider those as well. Car loans usually require a different level of insurance. Make sure to count that as well. Taking these points into consideration, I would suggest, paying off the 2.54% car loan first, then putting the extra $419.61 into your mortgage to build up more equity, and leaving the 0% loan to run it's full course. You all ready "paid for" that loan, so might as well use it. Side note: If you can find a savings account or other investment platform with a decent enough interest rate, you would be better served putting the $419.61 there. A decent rate ROTH-IRA would work very nicely for this, as you would get tax deferment on that as well. Sadly it may be hard to find an account with a high enough interest rate to make it a more attractive option the paying off the mortgage early.