So what is an AIA?
You can deduct the full value of an item that qualifies for annual investment allowance (AIA) from your profits before tax. This includes plant & machinery of which air conditioning comes under. You can currently claim up to £500,000. This is nothing to do with the ETL and just based on plant.
Read more here – HMRC
So what’s changing?
The AIA has changed 4 times since 2008 and is due to change again to £25,000 on 1 January 2016.
That is a substantial change and worth your end user client being aware of as that could impact their accounting period for major refit works including air conditioning.
Again, visit the above HMRC link or browse to https://www.gov.uk/capital-allowances/annual-investment-allowance