Using Free cash Flow or h2so4's formula could be seen as a lazy way to calculate 'owners earnings' because it doesn't address the points you raise.
If you improve your working capital position you have generated cash - thats good eh. Even better is business's like RBD can use creditors money as a source of capital (unlike SKL)
To overcome the problems like increases in unpaid tax as at balance date a more convential figure to use is trade working capital - ie inventory + trade debtors + trade creditors. This leaves out things like employee provisions and tax which are amounts where the liability has been incurred but not paid.
Over the course of time these things generally all balance out anyway and don't really impact upon the 'intrinsic value' of the company anyway
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