I have recently acquired a client and am preparing my first set of accounts for them. I was staggered to see ACT on the tax calculation. I just about remember it existing when I qualified but haven't seen it on accounts for years. Looking back through the documents available to me, I see it did genuinely occur in 1998 and has just been carried forward year after year. Can I just write it off or is there a reason that I have to continue to carry it forward? To begin with, I thought it was just a provision in the accounts and I was going to lose it - we're talking less than £1,000 - but then I saw it on the tax calculations each year and thought I'd better double check before writing it off.