A tax disc is an official document that displays the vehicle's road tax. There are several synonyms for the word "tax disc" that can be used interchangeably in different contexts. In the UK, the tax disc is also referred to as the "Vehicle Excise Duty," while in other countries, it may be called a "road tax certificate" or a "registration sticker." The tax disc has been replaced by an electronic system in many countries, but some still use physical tax discs as proof of payment. Other common synonyms for tax disc include "license plate sticker," "windshield sticker," and "tax tag." Regardless of the name used, the purpose remains the same: displaying proof of payment for road tax.