capital gain tax payment

If any person has income only short term capital gain u/S 111A. This short term capital gain accrued or received in first quarter i. e. Before the payment of first installment of advance tax.
Now, query is
The person will pay full amount of tax on short term capital gain on 15 June or will pay only 15% of tax liability on 15 June as advance tax on stcg i. e. payment of tax in installment of advance tax.
If pay full amount of tax liability on 15 June then please give reference of section if any
Thank you