See your quarterly advance tax installment schedule based on your estimated total tax for the year.
If your total tax liability for the year (after subtracting TDS/TCS) exceeds ₹10,000, you're required to pay advance tax in quarterly installments rather than one lump sum at filing time. This applies to freelancers, business owners, and anyone with significant income beyond salary (capital gains, rent, interest, etc).
This calculator assumes a flat estimate across the year and doesn't account for income that fluctuates quarter to quarter, or interest penalties (Section 234B/234C) for shortfalls. Verify with a CA before making payments.