Really? I don't see any evidence of that (searched for HMRC and shed, only 4 threads, none relevant).
It will be interesting to hear what HMRC say.
On the mixed use bit, yes a structure with more than one use is treated as separate structures, so the play house part you can claim for - provided it is actually designed and built specifically as a play house (for instance like
this) *not* just as a somewhere for children to play like this. Now if the whole thing was designed and built as a playhouse and you did use it all for play, but also used some of it for storage some of the time, it could all qualify as a play house.
But, and this is a big but, if HMRC inspected your accounts they may decide to disallow it on the basis that the play house is a Building (on which neither AIA nor any other allowance is now available), or is a Structure that is not Plant or Machinery. The most relevant case law concerns a swimming pool, which was found to qualify for capital allowances. The deciding factor was that the business use of the swimming pool (the enjoyment of its use by paying residents of a holiday caravan park) was something that took place
using the swimming pool, not something that could in general happen anywhere but just happened to take place there. Streching this argument to a play house is obviously treading a fine line - the play that takes place inside a play house
could in fact take place inside any structure.
The way that this would work is that HMRC would decide that you could not claim the AIA for the expense. They would raise an assessment on you for tax and Class 4 NI on the amount. You could ask for this assessment to be reviewed, or take it to a tribunal. In order to be successful, you would probably need legal representation to research the case law and argue the relevant points, which would cost a significant sum of money.
So if you think that you are entitled to claim, go ahead and claim. But be prepared that HMRC may take a different view.
If you write to HMRC explaining all the facts and ask for a 'post-transaction ruling' under HMRC Code of Practice 10 (known in the trade as a COP10 ruling), they will give you a written answer which you can rely on. In this situation I think it would be unwise to rely on a telephone conversation because it would be difficult for you to prove that you had disclosed all the relevant facts.
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