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The share of part-time employment in total employment has risen in most OECD countries over the past decades. While this is often associated with increased female labour force participation and the desire of many workers to achieve an improved work-life balance, there has been a significant decline in the average earnings of part-time workers relative to full-time workers, as well as an increase in involuntary part-time employment in a number of countries. This paper presents a summary of the taxation of part-time work in OECD countries. It includes new calculations of the effective tax rates on part-time work including those for male and female part-time workers and for different household types. These indicators provide an evidence base for policymakers looking to understand the impact of the tax system on the choice of employment form. The analysis shows that average tax rates for part-time workers are lower than those applied to full-time workers in almost all OECD countries, reducing post-tax gender wage gaps, although marginal tax rates are often higher for part-time workers. These differences between the taxation of part-time and full-time workers are largely due to differences in earnings levels, and therefore to the progressivity of countries’ tax systems, rather than to differences in the tax treatment applied to part-time workers relative to full-time workers.

Thriving middle classes are the backbone of democratic societies and strong economies, but in many countries, they face mounting pressure as their economic strength is eroding relative to higher-income households. Real wages and incomes for most middle-class households have grown only very slowly, and rising expenditures have been putting further pressure on living standards. Meanwhile, globalisation, digitalisation, and demographic change are eroding job opportunities for middle-skilled workers, who risk sliding into lower-paid employment. The COVID-19 crisis has accentuated socio-economic divides and may end up accelerating some of the above trends. This publication builds upon the OECD’s publications on the middle class (Under Pressure: The Squeezed Middle Class) and social mobility (A Broken Social Elevator? How to Promote Social Mobility). It demonstrates that the German middle class is similar in size as in peer countries, but substantially smaller than it was in the mid-1990s. Lower middle‑class households face an increased risk of slipping out of the middle; meanwhile, upward mobility into the middle has declined, particularly for workers in 'typical' middle-class occupations. Employment growth forecasts point to further occupational polarisation. The review proposes policy options for strengthening the employability of middle-class workers, creating good-quality, future-oriented jobs, and boosting middle‑class disposable incomes.