Effect on future profits of choosing a real or nominal discount rate

A provision is required to be set up for an expected cash outflow of €100,000 (estimated at current prices), payable in three years’ time. The appropriate nominal discount rate is 7.5%, and inflation is estimated at 5%. If the provision is discounted using the nominal rate, the expected cash outflow has to reflect future prices. Accordingly, if prices increase at the rate of inflation, the cash outflow will be €115,762 (€100,000 × 1.053). The net present value of €115,762, discounted at 7.5%, is €93,184 (€115,762 × 1 ÷ (1.075)3).

If all assumptions remain valid throughout the three-year period, the movement in the provision would be as follows:

Undiscounted
cash flows

Provision

C

Year 0

115362

93.

Unwinding of discount (€93,184 x 0.075)

6,989

Revision to estimate

Year 1

115,762

100,173

Unwinding of discount (€100,173 x 0.075)

7,513

Revision to estimate

Ycar 2

115,762

107,686

Unwindine of discount (€107,686 x 0.075)

8,076

Revision to estimate

Year 3

115,762

113,762

If the provision is calculated based on the expected cash outflow of €100,000 (estimated at current prices), then it needs to be discounted using a real discount rate. This may be thought to be 2.5%, being the difference between the nominal rate of 7.5% and the inflation rate of 5%. However, it is more accurately calculated using the Fisher relation or formula as 2.381%, being (1.075 ÷ 1.05) – 1. Accordingly, the net present value of €100,000, discounted at 2.381%, is €93,184 (€100,000 × 1 ÷ (1.02381)3), the same as the calculation using future prices discounted at the nominal rate. If all assumptions remain valid throughout the

three-year period, the movement in the provision would be as follows:

Undiscounted
cash flows €

Provision

Year 0

100,000

93,184

Unwinding of discount (€93,184 x 0.02381)

2,219

Revision to estimate (€100,000 x 0.05)

5,000

4,770

Year 1

105,000

100,173

Unwinding of discount (€100,173 x 0.02381)

2,385

Revision to estimate (€105,000 x 0.05)

5,250

5,128

Year 2

110,250

107,686

Unwinding of discount (€107,686 x 0.02381)

2,564

Revision to estimate (€110,250 x 0.05)

5,512

5,512

Year 3

115,762

115,762