Present Value of a Growing Annuity Formula

Formula

PV = Pmt  x (1  - (1 + g)n x (1 + i)-n ) / (i - g)
Variables used in the annuity formula
PV = Present Value
Pmt = Periodic payment
i = Discount rate
g = Growth rate
n = Number of periods

Use

The present value of growing annuity formula shows the value today of series of periodic payments which are growing or declining at a constant rate (g) each period. The payments are made at the end of each period for n periods, and a discount rate i is applied.

A growing annuity is sometimes referred to as an increasing annuity or graduated annuity.

The formula discounts the value of each payment back to its value at the start of period 1 (present value).

When using the formula, the discount rate (i) should not be equal to the growth rate (g).

Present Value of a Growing Annuity Formula Example

If a payment of 8,000 is received at the end of period 1 and grows at a rate of 3% for each subsequent period for a total of 10 periods, and the discount rate is 6%, then the value of the payments today is given by the present value of a growing annuity formula as follows:

PV = Pmt  x (1  - (1 + g)n x (1 + i)-n ) / (i - g)
PV = 8,000  x (1  - (1 + 3%)10 x (1 + 6%)-10 ) / (6% - 3%)
PV = 66,550.43

Present Value of a Growing Annuity Formula if i = g

The above formula will not work when the discount rate (i) is the same as the growth rate (g). In this situation, the formula shown below should be substituted.

PV = Pmt x n / (1 + i)
Variables used in the annuity formula
PV = Present Value
Pmt = Periodic payment
i = Discount rate
n = Number of periods

For example, if a payment of 8,000 is received at the end of period 1 and grows at a rate of 3% for each subsequent period for a total of 10 periods, and the discount rate is also 3%, then the value of the payments today is given by the present value of a growing annuity formula as follows:

PV = Pmt x n / (1 + i)
PV = 8,000 x 10 / (1 + 3%)
PV = 77,669.90 

The present value of a growing annuity formula is one of many annuity formulas used in time value of money calculations, discover another at the link below.

Present Value of a Growing Annuity Formula November 6th, 2016Team

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