Like all regions of Spain, the Canaries have a Purchase Tax.
Tipping in Canary Islands: Gratuities are not mandatory in the Canaries as all Spanish restaurants include Service in the bill. Tipping is normal in bars, restaurants, hotels and taxis as a proportion of the bill and at the Tipper's discretion.
Taxes in Canary Islands: Called the IGIC (General Indirecto Canario Tax), it is levied at 5% in restaurants, hotels and shops, with the exceptions of 2% for clothes and footwear and 13% for Car Hire and jewellery.
It contains information that would be useful to know before you travel to Canary Islands.