PurposeThe study explores the relationship between information overloading and the complexity of reporting. In particular, it investigates whether voluntary information in a firm annual report is associated with its readability. Likewise, it examines how a firm's profitability and earnings management practices impact the nexus of voluntary disclosure and readability.Design/methodology/approachIt uses the annual reports of the Egyptian nonfinancial firms listed in the EGX 100 index from 2010 to 2018. The readability of the annual report is measured automatically using the LIX index, and a predeveloped voluntary disclosure index is used to measure the level of voluntary disclosure in the annual reports.FindingsThe results reveal that the readability of annual reports is a negative function of voluntary disclosure, suggesting that Egyptian firms with more voluntary disclosure are likely to have more complex (i.e. less readable) annual reports. Likewise, less profitable firms and firms with earning management practices increase voluntary information in their annual reports, resulting in an adverse impact on their reporting readability.Research limitations/implicationsIt focuses only on the annual reports of Egyptian firms and considers a firm’s overall voluntary information rather than a particular area of voluntary disclosure. It introduces a code to measure the readability of Arabic-written texts, which can be applied to different areas of disclosure.Practical implicationsPolicymakers in Egypt are encouraged to develop enforceable regulations to control voluntary disclosure in annual reports. Egyptian investors should view the practice of higher voluntary disclosure skeptically as its aim may be to divert attention from a firm's poor performance and earnings management practice.Originality/valueThe study is the first evidence from Egypt on the effect of information overloading, proxied by voluntary disclosure, on the readability of reporting. Likewise, it contributes to methodological development in measuring the readability of Arabic-written annual reports.