Please click the link to view the table I have prepared.
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ttps://businessmodelblog.wordpress.com/2016/02/18/the-solution-to-why-d-and-ix1-tax-is-added-to-get-to-fcff/
Everyone above has explained, intensively, but has not really answered your question; why is Interest x (1-Tax rate) added back but not Depreciation x (1-Tax rate)
Basically, it is because when we convert accounting numbers to cash flow, the net result is add back Interest x (1-Tax rate) and Depreciation
To illustrate:
1. Consider zero depreciation and zero Interest: the net income and cash flow will be (S-C)x(1-tax rate)
2. Consider zero depreciation (interest is existing): the net income and cash flow to equityholders (hence FCFE) is (S-C-I)x(1-tax rate). Because FCFF is an after-tax concept for both equity and debtholders, (S-C)x(1-tax rate) should be the cashflow for both debt and equity holders. add back Interestx(1-tax rate) to get from FCFE to FCFF.
3. Consider zero interest (existing depreciation). In accounting, when we get to the result S-C-D, in cashflow it is only S-C. We pay tax at (S-C-D)x tax rate. Hence the net income is (S-C-D)x(1-tax rate) [which is (S-C)x(1-tax rate)-Dx(1-tax rate)]. However, cash flow is at (S-C)-(S-C-D)xtax rate, [ultimately (S-C)x(1-tax rate)+DxTax rate]. To solve the difference between accounting and cash, D has to be added.
Conclusively, when interest and deprciation exists, to get from accounting numbers to cash flow, Depreciation and after-tax interest has to be added.