<h1>Revised TDS/TCS rules introduce Form 17 from April 2009; dematerialization delayed to 2010 due to IT issues.</h1> The Board has revised rules for Tax Deduction at Source (TDS) and Tax Collected at Source (TCS), introducing Form 17 for payments from April 1, 2009. For TDS or TCS before this date, Form 281 remains valid. The dematerialization of TDS/TCS certificates has been postponed to April 1, 2010, due to incomplete IT infrastructure. Amendments to sections 199 and 206C allow flexibility in TDS/TCS credit methods. Section 201 clarifies that failure to deduct or deposit tax makes one an assessee in default, effective retroactively from June 1, 2002, with similar changes to section 191 from June 1, 2003.