Cost of a permie = (Gross Salary + 13.8% ErNICs + 15% management overheads + 10% pension contribution + 10% training contribution) + ( the same rate again pro rata for n weeks to cover their notice period which is payable regardless of how quickly they go out of the door) * 120% because a permie is only ever 80% efficient, the rest being taken up with team meeting, career progression and other non-productive work.
HTH....

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