MEPs cost £1.79m a year, compared to MPs who cost £590,000 and peers who cost £130,000, figures published by the government reveal.
On Wednesday the Commercial Secretary to the Treasury, Lord Sassoon, revealed the cost of politicians in a written parliamentary answer given to Labour peer Lord Stoddart of Swindon.
The cost of parliamentarians is based on dividing their number by the overall amount of money spent on members.
In Westminster the House of Commons, which has 650 MPs, costs £385m a year and the House of Lords, which has had between 821-831 members, costs £109m.
However the 736 members of the European Parliament, which sits in Brussels and Strasbourg, cost European taxpayers £1,332bn.