Window-dressing in German inter-war balance sheets

German accounting rules value assets and liabilities asymmetrically and thus lead to grossly distorted balance sheets. In the inter-war debate on a reform of disclosure regulation, financial experts considered the (undisclosed) tax balance sheet, which had to be drawn up separately for the corporate tax assessment, as a paradigm for adequate financial disclosure. However, due to tax secrecy they were barred from analysing tax documents. Using archival evidence, we analyse tax balance sheets as a means of assessing the reliability of disclosed balance sheets of the inter-war period. It emerges that companies overstated their profits in the mid- and late-1920s, but grossly understated them in the Nazi economy.