Cash Tax Paid =

Tax Expense - Closing Tax Liability + Opening Tax Liability - Closing Deferred Tax + Opening Deferred Tax + (Net Interest * (Tax Rate/100))

The last part of this formula may be slightly unintuitive. The important thing to remember is that Free Cash Flow is always a measure of how much cash is available to the providers of capital (debt holders and shareholders), after all taxes and needs for reinvestment have been met.
In other words, Free Cash Flow is always after tax. This is why we include the line tracking  ‘Net Interest (after tax)’ in the Free Cash Flow section of the Cash Flow tool. 

Net Interest (after tax) =

Interest Expense - Interest Income - (Net Interest * (Tax Rate/100))

Cash tax paid (at the Operating Cash Flow level) is then adjusted to reflect the tax shield provided by the Net Interest.

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