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Do I pay a zero % loan before another to clear both loans faster?
At the moment, you are paying about $1,300 interest each month (£431k @ 3.625% / 12) on your mortgage and repaying capital at about $1,500 per month. Paying $11,000 off your mortgage would save you about $9,000 as it is reduces your balance by about seven monthly capital repayments: but you will only see this benefit at the end of the mortgage because you will pay it off seven months earlier. There is only about $1,000 interest remaining on your car loans. Paying the $11,000 off your interest free loan then paying extra agianst the interest bearing loan brings that down to $500 and paying it off your interest bearing loan brings it down to $200. Either way, both car loans would be finished by early 2018. In summary, if you use the $11,000 against your car loans, you will save $8,500-$8,800 less than paying it off the mortage, but you will have no car loans in one year rather than three. Google spreadsheet for calculations here.