This is legal- a company is allowed to carry any loss in a year back one year and claim a refund of tax egcompany paid 50*12.5%=6250tax last year. it made a loss of 100k in current year- 50 carry back and 50 carry forward and they get back 6250.
from what i see this will cost the revenue a lot of money as nearly every company now making a book loss will carry back loss to get some tax back to use as cashflow. this will also effect future revenue as less pre tax paid.
i just have a feelin that the budget might restrict this, i a bit late now as all major company tax returns filed on 21/09/08-advise any one going for back claim to have it in writing to revenue for before budget day.
a company should do a current impartment review as it will make accounts more accurate.