Abstract: A system and method are provided for analyzing tax avoidance of a taxpaying entity. A taxpaying entity's financial information may be analyzed and used to compute a set of one or more financial ratios based at least in part on the entity's return on assets, capital, sales, and/or operating expenses. Those ratios may be compared to corresponding ratios for related firms operating in a predefined industry to identify whether the taxpaying entity engages in tax avoidance. The level of the taxpaying entity's tax avoidance may be calculated from analysis of the taxpaying entities controlled transactions. An adjusted tax liability may be produced after re-distribution, re-apportioning, or re-allocation of income, deductions, credits, or allowances.