A financial transaction tax (FTT) is a levy on a specific type of financial transaction for a particular purpose. The tax has been most commonly associated with the financial sector for transactions involving intangible property rather than real property. It is not usually considered to include consumption taxes paid by consumers.

A tax is a compulsory financial charge or some other type of levy imposed on a taxpayer by a governmental organization in order to collectively fund government spending, public expenditures, or as a way to regulate and reduce negative externalities. Tax compliance refers to policy actions and individual behaviour aimed at ensuring that taxpayers are paying the right amount of tax at the right time and securing the correct tax allowances and tax relief. The first known taxation took place in Ancient Egypt around 3000–2800 BC. Taxes consist of direct or indirect taxes and may be paid in money or as its labor equivalent.