The model "Weight Average Capital Cost" (WACC) characterizes the average weighted return expected from the total capital invested in the company, both own and borrowed.
WACC is calculated by calculating the weighted cost of the components of the sources of financing using the following formula:
Example of calculating the weighted average cost of capital, excluding tax:
Source of capital 
Amount 
Weight 
Price, % 
Cost, % 
[1] 
[2] 
[3] 
[4] 
[5] 
Preference shares 
35 
0,1 
12 
1,2 
Ordinary shares 
105 
0,3 
17 
5,1 
Reinvested profit 
140 
0,4 
20 
8 
Borrowing sources 
70 
0,2 
18 
3,6 
Total: 
350 
1 
Х 
17,9 
WACC = (35 / 350) * 0,12 + (105 / 350) * 0,17 + (140 / 350) * 0,2 + (70 / 350) * 0,18 =
= 0,1 * 0,12 + 0,3 * 0,17 + 0,4 * 0,2 + 0,2 * 0,18 =
= 1,2 + 5,1 + 8,0 + 3,6 = 17,9

As can be seen, preferred and ordinary shares are converted into shares in equity (contributed) capital, reinvested earnings  the amount of retained earnings, additional and reserve capital.
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The tax rate, when calculating borrowed sources in the WACC, is not always used in practice, therefore in BudgetPlan Express there is the possibility to "include" or "not include" the rate in the calculation formula: in the settings, under the tab "Investment analysis".
In the settings table, you can enable (disable) the option: "Include a profit tax in the WACC calculation."
The introduction of interest rates in the BudgetPlan Express settings is mandatory, and not only for the calculation of WACC, but also for its use in other calculations, including the calculation of the complex EVA (Economic Value Added).
In general, if the company is a limited liability company, you can enter the same percentage in the "Preferred, ordinary shares, reinvested profit,%" fields. In this regard, it is useful to recall: the shares in the authorized capital, in the calculations of the program, are equated to ordinary shares.
The percentage (coefficient) of borrowed sources of financing is calculated automatically and for all periods as follows:
R = [ (∑Kn – ∑Zn) / ∑Zn ] х 100%,
r = [ (∑Kn – ∑Zn) / ∑Zn ] = ∑Kn / ∑Zn – 1,
Where:
Kn – all payments for n period;
Zn – credit money received for n period;
R – required percentage.
Thus, not only interestbearing money, but also other payments in the composition of the value of borrowed sources of financing are taken into account.
☛ Model weighted average cost of capital (WACC) is also used in the program when calculating the modified internal rate of return – MIRR.
To change the settings, see «General settings. Investment analysis»
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