PurposeThe choice of accounting methods is critical in measuring the performance and sustainability of a public defined benefit pension (DBP) plan, and such measurement has an impact on the effectiveness of the entire pension system. Prior literature rarely discusses the choice and rationale of the accounting assumptions for public DBP plans. This study fills the gap by investigating whether crucial plan characteristics, including operational performance, financial health, sponsor fiscal stress, and audit quality, are associated with the accounting assumptions of public DBP plans.Design/methodology/approachThe sample includes 1,170 plan-years from the intersection of the Center for Retirement Research and public DBPs' annual financial reports for the years 2001–2013. This study develops regression models to examine the relationship between the characteristics of public DBP practices and DBP accounting choices.FindingsThe empirical results show that the public DBPs that have better investment performance, higher funding status, less fiscal stress, and that are audited by Big 4 accounting firms are more likely to adopt conservative accounting choices.Originality/valueThe study documents the impact of crucial pension plan characteristics on public DBP managers' accounting choices, which were not extensively discussed in pension literature. The findings help us understand the rationale for employing different accounting treatments in the context of public pension fund practices. In addition, the study sheds light on policy implications for the future reform of public pension regulations.