# How much interest I can afford

October 17, 2012 1 Comment

The RATE function returns the interest rate of an investment, loan, or annuity based on a series of regular periodic cash flows.

The syntax of the rate function is

RATE(NPER, PMT, PV, FV, type, guess)

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NPER: The number of periods. NPER is a number value and must be greater than or equal to 0.

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PMT: The payment made or amount received each period. payment is a number value. At each NPR, an amount received is a positive amount and an amount invested is a negative amount. It is simple monthly payment you are intended to make or receive

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PV: (present value) The value of the initial investment, or the amount of the loan or annuity. present-value is a number value. At time 0, an amount received is a positive amount and an amount invested is a negative amount. In other words the amount of loan you intended to take

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FV: An optional argument that represents the value of the investment or remaining cash value of the annuity (positive amount), or the remaining loan balance (negative amount), after the final payment. future-value is a number value. it could be ballon amount.

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Type: Type (optional) defines whether the payment is due at the beginning (1) or the end (0) of a period

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Guess: Guess (optional) determines the estimated value of the interest with iterative calculation. normally it is ignored

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**lets understand the function with an example:**

I want to borrow 80,000 and make monthly payment for 10 years. The maximum monthly payment i can afford is 1,000. what is the maximum interest rate i can afford?

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**Solution:**

In the above example

NPER: number of month here we have been provided with 10 year that means NPER is equal to 10 X 12 = 120

PMT: Payment for the period, in our example it is given as 1,000 per month

PV: present value. here the present value will be 80,000 which is amount i am borrowing now. we are inputting this value with – before it, because it will be cash outflow for the lender.

FV: it is an optional argument in out case we will put 0

Type: it can be either 1 or 0, in our example we are putting 0 assuming the installment will be paid at the end of the period (i.e. month)

Guess: we can leave this argument

the formula in cell B5 is =RATE(B2,B3,-B1,0,0)

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I got the as 0.007241020100393 which i formatted using the % to convert it 0.72%

the above rate is period rate we have to convert this into annual rate

**to convert this to annual rate we have multiplied it with 12**

for the formula in cell B5 is =RATE(B2,B3,-B1,0,0)*12

the solution to the problem is

i can afford up to 8.69% interest for my loan of 80,000/- for a period of 10 years

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