AS 22 deals with the above the line items .and in accounts loss is shown as opening DR balance in P&L appropriation Account which is below the line.and provision for Tax in accounts is charged to current year profit.
But the amount of provision for tax is calculated as per income Tax books and after allowing set off of previous year loss.thats why in future year when we have to pay tax we will consider the loss arised in previous year.
further in accounts you cant set off losses for paying income tax, as income tax is paid as per income TAx books and in income tax losses is allowed to be set off for paying tax.
while in accounts loss is carried at below the line.
SO ITS ALL BECAUSE OF THAT PROVISION IS CREATED AS PER INCOME TAX BOOKS WHICH ALLOWED LOSSES TO BE SET OFF WHILE IN ACCOUNTS LOSSES IS TAKEN BELOW THE LINE.HAVE NO EFFECT ON DETERMINATION OF CURRENT YEAR PROFIT.
i hope you would have understand.