Under the Companies Act, 1956, a company is required to maintain its books of account and vouchers for a period of 8 years immediately preceeding the current year.
Under Income Tax Act, assessees are required to preserve the specific books of account for a period of 6 years from the end of the relevant assessment year, i.e., for a total period of 8 previous years.
Under Central Excise, records to be maintained for 5 years immediately after the financial year to which such records pertain. There is nothing like assessment year under Central Excise law.
Under VAT, Each State has prescribed the accounts and records required to be maintained by a VAT dealer and the provisions regarding preservation of such accounts and records e.g. dealers registered under Delhi VAT are required to preserve records and accounts for 7 years, from the end of the relevant assessment year.