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Do I pay a zero % loan before another to clear both loans faster?
This is more of an interesting question then it looks on first sight. In the USA there are some tax reliefs for mortgage payments, which we don’t have in the UK unless you are renting out the property with the mortgage.  So firstly work out the interest rate on each loan taking into account any tax reliefs, etc. Then you need to consider the charges for paying off a loan, for example often there is a charge if you pay off a mortgage.   These days in the UK, most mortgagees allow you to pay off at least 10% a year without hitting such a charge – but check your mortgage offer document. How interest is calculated when you make an early payment may be different between your loans – so check. Then you need to consider what will happen if you need another loan.   Some mortgages allow you to take back any overpayments, most don’t.  Re-mortgaging to increase the size of your mortgage often has high charges. Then there is the effect on your credit rating: paying more of a loan each month then you need to, often improves your credit rating. You also need to consider how interest rates may change, for example if you mortgage is a fixed rate but your car loan is not and you expect interest rates to rise, do the calculations based on what you expect interest rates to be over the length of the loans. However, normally it is best to pay off the loan with the highest interest rate first.  Reasons for penalties for paying of some loans in the UK. In the UK some short term loans (normally under 3 years) add on all the interest at the start of the loan, so you don’t save any interest if you pay of the loan quicker.    This is due to the banks having to cover their admin costs, and there being no admin charge to take out the loan. Fixed rate loans/mortgagees have penalties for overpayment, as otherwise when interest rates go down, people will change to other lenders, so making it a “one way bet” that the banks will always loose.   (I believe in the USA, the central bank will under right such loans, so the banks don’t take the risk.)