PRELIMINARY EXPENSE NOT WRITTEN OFF

You have to show under asset side , It is to be written off within 5 year , also allowable Expenditure as per section 35(d) of the Income tax act .

When you write off at the end of the year pass entry
preliminary expense write off A/c Dr
To preliminary expense A/c Cr
( preliminary expense write off )

write off from profit and Loss account.

Preliminary expenses should be reported under current assets