Capital plan

I have a client who is thinking of making some substantial investments in plant and machinery over the next couple of years.

I have mentioned the annual investment allowance (AIA) to the client and that there is a “window of opportunity” for relief to be claimed in respect of large amounts of expenditure.

I am also aware that there are some complex rules limiting the relief as the increased AIA levels are introduced.

However on the assumption that the planned expenditure on equipment is likely to take place towards the end of the period I started to wonder what the rules are when the relief reverts to a lower level. Is the relief simply apportioned or are things more complicated?

On a final point I am unsure whether the AIA and “ordinary” writing down allowances can be claimed on the same item in the same tax year....