Tax on sum received on sale of business

Hello All,

someone known to me is running a recruitment company (pvt. ltd) and is considering to sell the business including transfer of ownership.

Can anyone share their views as to treatment of tax on the proceeds received from such a sale? and any possibilities of tax planning.

Is there any other aspects that need to be considered from taxation point of view.

Also, what will be the business valuation for recruitment company (Example multiples of Income / net profit) etc..

information will be of great use.

thanks.