Traditional UK families with one working parent get the worst tax deal in the world, according to a new survey. A study for the Christian social policy charity CARE found Britain topped the world league table for the highest tax burden on a married earner with two children, compared to a single person on the same wage. Proportionally, the married worker pays a third more than the single person, the study found. In Britain, the tax burden on a married couple on one wage of £33,745, as a percentage of the tax burden on a single person on the same wage, is 73 per cent. In Luxembourg it is three per cent.