Large multinational companies now face three separate tax transparency regimes that report different data using incompatible definitions, creating what the Tax Foundation warns is "an easily misunderstood picture" of corporate activity. The regimes—introduced this year by the European Union, Australia, and the U.S. Financial Accounting Standards Board—were designed for distinct purposes but are often discussed together, producing confusion that will mislead policymakers and researchers trying to evaluate corporate tax behavior. All three systems went live in 2024, with first reports due in 2026.

The frameworks diverge on five critical dimensions, according to the Tax Foundation. The EU requires companies with at least €750 million in revenue to disclose tax data for all 27 member states plus jurisdictions on its non-cooperative tax list, lumping everything else into an aggregate category. Australia sets its threshold at AUD 1 billion in global revenue and breaks out 40 specified jurisdictions—including Hong Kong, Singapore, and Switzerland—but aggregates others like Luxembourg, Ireland, and the Netherlands. The U.S. FASB standard has no revenue floor and discloses individual countries only when they account for at least 5 percent of total taxes paid or show a 5 percentage point gap between local and U.S. statutory rates. A subsidiary in Singapore would appear as a standalone line in Australian reports but vanish into the EU's "all other tax jurisdictions" bucket. Timing also differs: the FASB rule applies to years starting after December 15, 2024, while the EU targets financial years beginning on or after June 22, 2024, and Australia covers income years from July 1, 2024 onward.

The definitions of core terms like revenue and profit vary sharply across systems, the report finds. The EU defines turnover to include net sales, operating income, and related-party transactions without separating internal group transfers from third-party sales. Australia demands that companies split out revenue from related parties, offering greater detail but making direct comparisons impossible. The report illustrates the problem: a German auto parts maker selling €500,000 in components internally to a French distributor, which then sells them for €1,000,000, must report the full €1,000,000 as EU revenue even though it's an intra-group transaction, "offering a distorted view of the company's economic activity in a jurisdiction." The FASB framework doesn't require country-by-country revenue breakdowns at all, instead focusing on percentage-point impacts on effective tax rates rather than dollar figures. None of the regimes report actual taxable income—all rely on financial accounting measures, which differ from tax returns due to rules on expensing, loss carryforwards, and credits.

These structural gaps matter because the same company can "legitimately report different revenue, profit, and effective tax rate figures for one jurisdiction," the Tax Foundation explains. An analyst comparing a firm's Australian, EU, and FASB filings for 2026 could see Singapore broken out in one report, aggregated in another, and absent entirely from the third—not because business operations changed, but because the reporting frameworks classify it differently. The report warns that combining data from multiple transparency systems "without adjusting for discrepancies in scope, timing, jurisdictional coverage, and accounting definitions—will produce unreliable results." Policymakers and researchers evaluating corporate tax behavior are especially vulnerable to misinterpretation, since apparent shifts in activity may reflect nothing more than differences in how each regime defines and categorizes the same underlying transactions. The bottom line: all three regimes are measuring different things on different schedules, and treating them as comparable will generate false conclusions about where companies earn profits and pay taxes.