The Global Minimum Tax Is Actually Working: 2026 Revenue Numbers

The mechanism is simple in design. Under the global minimum tax, any large multinational group - roughly those with revenue above EUR 750 million - is subject to a minimum effective tax rate of 15 per cent on profits in every country where it operates. If a subsidiary pays less than that, the gap is collected by the parent’s country through a top-up tax.

The 2026 numbers are the first real test. The OECD estimates that top-up taxes collected in 2026 reached double-digit billions of dollars, with the total expected to grow as more countries pass implementing legislation. The revenue is disproportionately coming from a small number of highly profitable digital and pharmaceutical multinationals whose effective rates were previously in single digits.

The country-by-country pattern is striking. The biggest collections so far are in the EU, Japan, South Korea and Canada - jurisdictions that passed the rules early and enforce them. The United States, whose political process has stalled on implementation, is not yet collecting, which means some revenue that would otherwise flow to Washington is going elsewhere.

The loopholes are real and being tested. The first is timing: several countries granted generous transition periods, delaying top-up collections. The second is the substance-based carve-out, which exempts a return on tangible assets and payroll - designed to protect real activity but capable of being gamed. The third is the patchwork: not all countries have enacted the rules, and where they have not, the minimum does not apply.

The bigger question is whether the deal holds together. The agreement was always a compromise between countries that wanted a high floor and those that feared losing investment. Multinationals are already restructuring - moving profit-reporting to favourable jurisdictions and evaluating whether to challenge the rules in court. The next wave of litigation will test the legal foundations.

For governments, the revenue is welcome but the strategic prize is different: the global minimum tax breaks the race-to-the-bottom cycle where countries compete by cutting corporate rates to zero. Whether the floor holds at 15 per cent - or drifts upward in a future round - depends on whether the largest economies keep enforcing it. In 2026, the answer is: so far, yes.

The next fight is over where the revenue lands.

The floor is working; the allocation is not settled. The first real revenue confirms the minimum tax's core mechanic: profits previously shifted to zero-tax jurisdictions now pay at least fifteen percent somewhere. The unresolved question is which somewhere - the negotiators' original plan included reallocating a slice of the largest companies' profits to market countries, and that piece has been renegotiated ever since, with the largest economies pulling in opposite directions. Until that settles, the revenue is flowing to headquarters and holding jurisdictions, which is why developing economies - the agreement's promised beneficiaries - are the loudest voices pressing for the allocation piece to finally bind.

Tax competition did not die; it moved up the stack. With headline rates floored, incentives have migrated to formats the minimum does not catch: refundable credits, grants, subsidised land and energy, and bespoke deals for specific investments. Watch any national subsidy race for a semiconductor plant or a data centre to see the new shape of competition. For tax administrations the task list is correspondingly updated - policing substance requirements so that paper headquarters in low-tax states do not simply become real subsidiaries, and tracking whether incentive stacking recreates, in credits, what the floor removed from rates.