Hi CK
You are confusing two separate things here.
Some companies e.g. CRH declare a cash dividend and allow the shareholder to use the net amount to buy shares at a set price and without stockbrokers' charges.
You will get a dividend counterfoil which will show the gross dividend, DWT, and the net dividend. You treat that just like a cash dividend and pay income tax on it.
The advantage is that it is usually at a small discount to the price of the share on the day and there are no stockbrokers' charges.
A scrip issue is something else. The company just issues new shares to all its shareholders. It doesn't pay anyone any cash. This is not a taxable transaction as there is no income or no wealth generated.
Say a company has 100 shares worth €11 each. The company is worth €1,100 .
They issue one free share for every 10.
The company is still worth €1,100 but there are now 110 shares, so each share is worth €10.