Discussion Papers,
Statistics Norway, Research Department

Abstract: This paper examines how an often-overlooked source of pay transparency—the public disclosure of tax information—affects gender wage gaps. We exploit a 2001 change in Norway that made individual tax returns searchable online. Using matched employer–employee data and a difference in-differences design, we find that within-firm gender wage gaps fell by 2.2 percentage points (8.7 percent), driven by rising female wages. Effects are strongest in private-sector firms, industries with initially larger gaps, and municipalities that previously lacked easy access to printed tax lists. Wage gains are concentrated among job-changing women, suggesting that broad-based transparency mainly operates through improved information for job search.

Keywords: Gender Wage Gap; Income Transparency; Public Disclosure of Tax Information

JEL-codes: J16; J31; J38

49 pages, February 2026

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