S. 153 : Assessment – Reassessment – Limitation –Revision- When an is set aside or cancelled -Fresh assessment can be made only before expiry of two years from the end of the financial year in which the order u/s 263 was passed – Order giving effect-Though no limitation is prescribed the order should be passed within reasonable time – Delay of eight and half years is held to be not valid in law .[ S.263 ]