A land value tax in the UK would be mildly regressive, but distributing the revenue as a UBI would make the program highly progressive.

The land tax alone applies to a base of £5.5 trillion in non-governmental land value, raising £55 billion per year. Alone, this tax would raise the Gini index by 0.08%, but distributing the revenue as a UBI makes the tax highly progressive. The bottom decile’s income would rise by 16%, while the top’s would decline by 2%.