Last date of itr 31 july 2018, so what is four installment of advance tax means?

Amit Kumar Bansal (Job/Blogger) (688 Points)

14 July 2018  

According to the income tax department payment of advance, are according to four installments as below:

Due Date Advance tax Payable
On or before 15th June 15% of estimated Advance Tax
On or before 15th September 45% of estimated Advance Tax
On or before 15th December 75% of estimated Advance Tax
On or before 15th March 100% of estimated Advance Tax

The last date for filling ITR is 31st July 2018, on that date we are supposed to pay 100% tax liability. 

My question is how both are possible?