Thursday, December 5, 2019
Emily Satterthwaite (Toronto), A Do-Over For The Tax Unit (JOTWELL) (reviewing Margherita Borella (University of Torino), Mariacristina De Nardi (University College London) & Fang Yang (Louisiana State University), Are Marriage-Related Taxes and Social Security Benefits Holding Back Female Labor Supply?):
There has been a surge in empirical literature examining gendered patterns of behavior and outcomes across numerous economic contexts, especially choices within and across families. Relatively little of it has focused explicitly on how the basic structure of our tax laws interacts with and influences such choices. Encouragingly, a recent working paper by Margherita Borella, Mariacristina De Nardi, and Fang Yang does exactly that.
Borella, De Nardi, and Yang (BD&Y) study two key policies within the U.S. tax-transfer system: joint income tax filing for married couples and access to Social Security benefits for spouses. The joint income tax filing rule means that a married secondary earner will owe income tax at the marginal rate established by “stacking” her income on her spouse’s income, which generally is a higher rate than would apply if the secondary earner was single. Social Security benefits also increase to account for an earner’s spouse, but do not increase to account for an earner’s unmarried partner.
Both of these policies are gender-neutral on face; however, the background conditions under which they operate are not. ...
These results underscore the centrality of policies that narrow the gap between females’ and males’ labor supply choices, particularly earlier in their careers. For men and women alike, BD&Y’s results echo other studies in finding that accumulated human capital from work experience has a greater influence on wages than other factors like education. (Pp. 25-26.) Robust female participation, particularly during lifecycle years when their children are likely to be small, lays the groundwork for greater wage and income equality later in the lifecycle. BD&Y’s paper provides evidence that joint filing discourages this outcome.
In going to great lengths to estimate rigorously the impact of a core structural element of the U.S. income tax (joint filing), BD&Y have done valuable work. Their findings are not presented as a rallying cry for revisiting longstanding normative questions about gender (in)equality’s role in the design of tax policy. But the larger context invites such a read. At bottom, this paper provides new empirical support for the premise that gender belongs at the center of tax policy debates about inequality.