Minimum Wages, Minimum Labour Costs and the Tax Treatment of Low-Wage Employment

International comparisons of minimum-wage levels have largely focused on minimum wages before tax, ignoring the effects of taxation on both labour costs and the net income of employees. This paper presents estimates of the tax burdens facing minimum-wage workers. Results show the evolution of net incomes and labour costs during the 2000-2005 period and the relative importance of minimum-wage adjustments and tax reforms in driving these changes. Statutory minimum wages are in place in 21 OECD countries, ranging between USD 0.7 and USD 10 per hour. In a number of countries, minimum wages have gone up in real terms in recent years. Given considerable tax burdens even at the lowest wage levels, tax policy measures can have a sizable impact on the net earnings available to low-wage workers. Social contributions and payroll taxes add, on average, around 15% to the cost of employing minimum-wage workers. Despite reductions in non-wage labour costs in several countries, there has been no convergence of minimum labour costs in recent years. This paper is the working paper version of a chapter to appear in the 2007 edition of Taxing Wages, an annual OECD publication. The Taxing Wages chapter will include results for the years 2000-2006