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What is a formula for calculating equity accumulated while repaying car loan?
Here is a simple way to analyze the situation. Go to your bank or credit union website and use their loan calculator with their current real interest rates and down payment requirements. Enter the rate, and number of years. Enter different values for the loan amount to get the monthly payment to the level you want ($400). Today for my credit union, the max loan would be about $9,500. Keep in mind there may be taxes, registration fees, and down payment on top of this. Jump ahead two years. The loan is paid off, the car is owned free and clear. You will be able to sell it and get some money in your pocket.  If you go for a longer term loan to keep the payments under your goal the issue is that in two years you might be upside down on the loan. The car may be worth less than the remaining balance on the loan. Your equity would be negative.