by :

**Adam Boulton**

Amortization is the process of paying off a loan. Every month a portion of the principal and some interest is paid. Amortization formula is the calculation of the payment amount per period. An amortization calculator is used to find the periodic payment amount due on a loan based on the amortization process.

Auto loan amortization calculator has a table which shows how the auto loan works month by month. This gives an idea of the interest paid over the years and the balance to be paid at any given time. After filling in the information related to the loan, the calculate button should be clicked and a table will appear in the text box below.

Using the amortization table, payment of more money than the vehicles' worth can be avoided. To achieve this, some estimation on the vehicles value after certain number of months should be made. Then, amortization table can be used to see how much is left on the loan. Amortization table is already filled in for a general car purchase. Generally auto loans run from 48 to 72 months. The longer the term, the more the interest cost.

Amortization table takes into account down payment and trade in or cash rebate. Auto loan payment calculator can be used to analyze different types of loans by changing the loan amount, interest rate, term of the loan and the payment frequency.
It is also flexible, in the sense, additional payment can be made to pay off the loan early and avoid paying so much interest. Auto loan amortization calculator helps estimate the overall cost of purchasing a car, including the price, sales tax and other fees and changes like destination changes and trade in value of an old car.

**Rounding: ** Actual payments must be rounded to the nearest cent and the spreadsheet takes care of this process.

**Zero balance: **In amortization spreadsheet, the formula in the payment due column checks the last balance to see if a payment adjustment is needed to zero out the balance.

The auto loan payment calculator which is another worksheet in the excel workbook is based on the auto loan amount, annual interest rate, term of the loan and payment frequency. The spreadsheet contains the information about how to use the loan calculator as cell comments. Just entering the value in the white background will suffice. The payment calculator also helps to see how extra payments can help to pay off the loan early thus reducing the interest amount. It contains yellow cells where the values are to be entered and the spreadsheet is left unlocked giving room to modify it further.

The third worksheet comprising loan comparisons creates graph by taking input from the loan payment. This helps to know the different rates of interest, number of payments and the down payment affecting the monthly payment and total amount of interest. The auto manufacturer may offer incentives in the form of cash rebate or low interest rate and the auto loan calculator specifies the cash rebate and the annual interest rate.