In January 2010, the largest tax reform in Denmark in more than ten years began taking effect, shifting some DKK 30 billion (€ 4.0 billion) of tax revenue when fully implemented in 2019. Of this, more than DKK 25 billion (€ 3.4 billion) is used to lower the marginal tax on income in order to encourage work and investment. In 2010 the top marginal tax rate was lowered from 63 percent to 56.1 percent – its lowest level in at least 40 years.