Hey, 

I am afraid but there is no Late fees for JEE mains 2019 now.

JEE , also called as Joint entrance exam is now conducted by NTA, National testing Agency. From the current year, JEE is conducted in two times,One in January and one in April. Both exams are online examination. Those appeareing in 12th exams in the year 2019 or those who have vleared 12th in 2017 or 2018 can also appear in both exams on jan or april 2019. 

For april 2019 JEE main Exams, 

Online application was started from 08 february 2019 till 07 march 2019. 

And, Last fee payment was due till 08 march 2019 upto 11.50 pm. 

Correction portal opens from 11th march till 15th march for those who has paid the fees. 

I am sorry but the due dates are over for fees payment . You can always try for next year exam in Jan , if you are trying it. Or there are other exams for different colleges which you can shortlist and apply based on your interest college and streams. Also, Do make sure you check out colleges and applications as early as possible. 

There are exams like BITSAT which has application open till march 20th. Do chech out as soon as possible. 

Hope it helps, Contact for more queries.