Is this spreadsheet a tax evader?

This paper, by Ray Butler of H.M. Customs and Excise, summarises the audit experience, describes the methodology and outlines the results to date of a campaign of spreadsheet testing started in July of 1999. Of the seven spreadsheets selected for audit, six contained significant errors. It was published in the proceedings of the 33rd Hawaii International Conference on System Sciences in 2000, and is available at


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