It has been well flagged that the AIA is being reduced from £100,000 to £25,000 on 5th April 2012.
There is another budget to go before the reduction comes into play, but please note that it is also subject to your financial year – not just the date the expenditure was incurred.
So, for instance, if you have a March/April 5th year end life is simple.
If however, your year end is, say 30th June, then your AIA entitlement for 30th June 2012 becomes:
(9/12 * 100,000) + (3/12*25,000) = £81,250.
ABOVE ALL, it never makes sense to spend £1 to save 40p, so do not let the legislation change drive you to spend money that otherwise you might save. IF, HOWEVER you need to change equipment, please be mindful of the above. You may not get £100,000 * 100%.