Mortgage Amortization Excel Spreadsheet - Free Download
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Mortgage Amortization Excel Spreadsheet
EC100
This program calculates the monthly mortgage payment PMT that is required to pay off a mortgage loan of $L with equal monthly payments over Y years.
Click on the worksheet named "TABLE" at the bottom of this worksheet to go to the sheet with the required calculations and the amortization table. You are required
to enter numerical values for L, Y and rate, the latter being the annual interest rate (in decimal form) the bank charges on the loan. The bank will convert it to a
monthly compound rate simply by dividing RATE by 12. The monthly rate is calculated by the program, as shown. The number si red are those you must submit.
The number in black are calculated by the program.
To calculate the monthly mortgage payment PMT, the program uses the equation I had used in class, to wit:
PMT = (iL) / [1 - 1/(1+i)
(12Y)
]
The program will, first, draw a graph showing you what the monthly mortgage payment PMT would be at different values for the annual borrowing rate (RATE).
given the values for L (the loan) and Y (the years over which it is to be paid back) that you have submitted to the program. Benath the graph you will then see
the amortization table for the particular payment PMT implied by the values of L, Y and RATE that you have submitted.
This amortization table assumes N to be 30 years. Therefore it has 360 rows. If you submit a value of, say, Y =15, then the program will still calculate values
for 360 rows, but the entires for any row beyond the 180th payment will be meaningless. The row for the 180th payment should have a 0 in the right-most cell.
Usually mortgages do not exceed 30 years. If you submitted Y = 40, the program would still calculate the correct payment and draw the proper graph, but the
amortization table would go only to the 360th payment, not all the way to the 480th payment.
If you ever take out a mortgage loan, you should insist that the banker extending the loan print out for you an amoritzation table that shows exactly how much you
still owe after having made the nth payment. In the table shown here, that amount is in the right-most column of the row for the nth payment. If the banker won't
provide the table, prepare one yourself and have them sign off on it. It is the best protection against unpleasant surprises. As we have learned in the past half
decade, the world of finance appears to be run on sometimes dubious ethical standards. (I personally have had the experience of being told that I owed more
after paying N payments than I knew I did. ) Knowing something about the technical aspects of finance is the best protection against being fleeced in the world
of finance. It has helped me on more than one occasion.
AMORTIZATION TABLE FOR MORTGAGES: EXPLANATORY NOTES
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