What are they, cakes or biscuit's?
Cake.
Categorisation as cake or biscuit for VATIn the United Kingdom, value added tax is payable on chocolate-covered biscuits, but not on chocolate-covered cakes. McVities defended its classification of Jaffa Cakes as cakes at a VAT tribunal in 1991, against the ruling that Jaffa Cakes were biscuits due to their size and shape, and the fact that they were often eaten in place of biscuits. McVities insisted that the product was a cake, and allegedly produced a giant Jaffa Cake in court to illustrate its point. The product was assessed on the following criteria:
>The product's name was regarded as a minor consideration.
>The ingredients were regarded as similar to those of a cake, producing a thin cake-like batter rather than the thick dough of a biscuit.
>The product's texture was regarded as being that of a sponge cake.
>The product hardens when stale, in the manner of a cake.
>A substantial part of the Jaffa Cake, in terms of bulk and texture, is sponge.
>In size, the Jaffa Cake is more like a biscuit than a cake.
>The product was generally displayed for sale alongside other biscuits, rather than with cakes.
>The product is presented as a snack and eaten with the fingers, like a biscuit, rather than with a fork as a cake might be. The tribunal also considered that children would eat them in "a few mouthfuls", in the manner of a sweet.
The court found in favour of McVities and ruled that the product should be considered a cake, meaning that VAT is not paid on Jaffa Cakes in the United Kingdom.
In Ireland, Jaffa Cakes are regarded as cakes by Revenue as their moisture content is greater than 12%. As a result, they are charged the reduced rate of VAT (13.5% as of 2016).
https://en.wikipedia.org/wiki/Jaffa_Cakes#Categorisation_as_cake_or_biscuit_for_VAT