Free Cash Flow Iteration

To qualify this post I have about 6 months of LBO modeling experience. As a general rule, I calculate FCF for debt paydown as:

FCFDP = NI + Depreciation + Amortization - Capex +/- Change in NWC

I am aware there are multiple ways to think about arriving at a FCF calculation but am curious why it's common to use an iterative calculation, IE starting at NI, rather than starting at EBIT*(1-tax rate)?

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