Statement of Standard Accounting Practice (SSAP) 24 required, for the first time, particular levels of disclosure in relation to firms’ pension arrangements. Whilst this was a major step forward, it allowed a significant degree of discretion. This discretion meant that SSAP 24 was an observable measure of the quality and quantity of accounting disclosure for firms. This information can be used to determine the types of firms that give less information or use weaker assumptions. In my analysis, I find some evidence that large firms give more complete disclosures, but also that they are more able to exert influence on their actuaries to use weaker assumptions for the valuation of pension scheme liabilities. There is also some evidence that more profitable firms disclose less, so firms with a higher average tax rate might want to overfund their pension scheme. Finally, there is evidence that highly levered funds are less likely to give complete disclosure, and that when they do disclose their assumptions, they use a weaker basis.