Hi @9_kumar
Advance tax is payable on the estimated income. Here’s a read on How to calculate advance tax?
Considering you’re a resident in India below 60 years of age, have an income of 20 lakhs from freelancing, and have no other expenses and deductions. The tax liability shall be approx 4.3 lakhs.
You can read in detail about Advance Tax Due Date lurking, time to pay up! ⏳.
Hope this helps.