Jaffa Cakes look like a biscuit, get eaten like a biscuit, and sit in the biscuit aisle. Legally, in the UK, they are cake. The reason comes down to a tax tribunal in 1991.
A tax question, not a snack debate
UK VAT rules zero-rate most food, including cakes, but carve out an exception for confectionery - and chocolate-covered biscuits are specifically classed as confectionery, meaning standard-rate VAT applies. Plain cakes, even chocolate-covered ones, stayed zero-rated. That distinction meant HM Customs and Excise wanted to tax Jaffa Cakes as chocolate biscuits, while McVitie's, which makes them, argued they were cakes.
The case McVitie's built
McVitie's case rested on a handful of characteristics that push a product toward "cake" rather than "biscuit": Jaffa Cakes contain a sponge base, they're sold in a box rather than a wrapped stack, and - crucially - the way they age. Biscuits generally go soft and stale when they're left out; cakes go hard and dry. McVitie's argued a Jaffa Cake ages like a cake.
The giant Jaffa Cake
To make the point unmissable, McVitie's baked a Jaffa Cake roughly the size of an actual cake and presented it to the tribunal, demonstrating the sponge-and-jam structure at a scale nobody could mistake for a biscuit. It's the detail most people remember about the case, and it's genuinely part of the tribunal record rather than a piece of marketing folklore added later.
The lasting effect
The tribunal ruled for McVitie's, and Jaffa Cakes have been classified as cakes for VAT purposes ever since. The case is still cited as the go-to example whenever the cake-versus-biscuit VAT question comes up, precisely because it forced a court to define, in practical terms, what actually separates the two. It's also a handy reminder that in the sweet world, packaging and marketing rarely match legal definitions - something worth remembering next time you're browsing our own chocolate collection.
Frequently asked questions
Why does it matter whether a Jaffa Cake is a cake or a biscuit?
Cakes are zero-rated for VAT; chocolate-covered biscuits are taxed as confectionery. The classification changes how much tax is due on every one sold.
What did McVitie's do to prove Jaffa Cakes are cakes?
Among other evidence, it baked a giant, cake-sized Jaffa Cake and argued that Jaffa Cakes harden rather than soften as they go stale, like a cake does.
What did the tribunal decide?
It ruled in 1991 that Jaffa Cakes are legally cakes, not biscuits, for VAT purposes.