Sh.Kamal Chordia Ji,
As per Board's instructions you are to take permission again only if there is any change in input-output ratio. Change may be because of any reason not because of any budgetary changes. Change can occur because of advancement in science & technology.( New machinery, machines are computerized and revolution in information technology, modern ways and means to enhance the production etc. are vital factors to be considered.) As per Board's instructions, permission already taken in 2006 is still valid but there has been a considerable gap of 10 years since the last permission. Keeping in view the advancement in Science & Technology, earlier criteria adopted for arriving at input-out ratio may have lost its sheen. Moreover as per Board's instructions issued under F. No. 96/85/2015-CX.I, dated 7-12-2015(Para No.B.45), CBEC's Excise Manual of Supplementary Instructions, 2005 is being examined for revision of instructions contained therein.
In view of the above, it is better for you to opt for revised input-out ratio as a precautionary measure. It is your own interest. You will also be tension free.Latest permission based on latest formula for input-out ratio will be liked by every officer of the department. These are the practical benefits. There is no harm if you go ahead with the latest.