Taxpayers are urged to file by the new deadline to avoid penalties. Late filing after September 15 could result in a penalty of Rs5,000 for those with income above Rs5 lakh. For those earning below Rs5 lakh, the penalty is Rs1,000 under Section 234F. The deadline for belated or revised returns is December 31, 2025. Updated returns can be filed until March 31, 2030.