There are no tax implictions involved in the issue of shares.
In your second example shares will be being allocated to investors for more than tyheir par value. This is issuing shares at a premium and the surplus moneys received must be credited to a share premium account. The use of that account is limited. Accounting Web advise:
'(!) If a company issues shares at a premium, whether for cash or otherwise, a sum
equal to the aggregate amount or value of the premiums on those shares must
be transferred to an account called “the share premium account”
(2) Where, on issuing shares, a company has transferred a sum to the share
premium account, it may use that sum to write off—
(a) the expenses of the issue of those shares;
(b) any commission paid on the issue of those shares.
(3) The company may use the share premium account to pay up new shares to be
allotted to members as fully paid bonus shares'
However, something is screaming alarm bells in my mind that the option (3) is no longer available, but unfortunately I cannot run it to earth. Suffice to say were it used to remover the share premium account the founders with 80% of the capittal would not be changed in their slice of the company and would still have a controlling interest.