Advance Tax is essentially income tax paid in advance, in installments, during the financial year, rather than in a lump sum at the end. This applies when your estimated tax liability for the year exceeds ₹10,000. Founders, particularly those receiving significant income from salary, business, capital gains, or other sources, must estimate their income and calculate the advance tax payable. The installments are typically due on June 15th (25% of total), September 15th (50%), December 15th (75%), and March 15th (100%) of the financial year. Failure to pay advance tax on time or in full can lead to interest under Sections 234B and 234C of the Income Tax Act, 1961.