Global Minimum Tax 2026: $124 Billion Raised as US Corporate Receipts Plunge 16%

More than 60 countries and territories now apply a 15% global minimum tax on large multinationals, and the first hard evidence shows it is working, at least on revenue. The OECD estimated in July 2026 that the reform raised €79 billion to €109 billion ($90 billion to $124 billion) in its first year, equal to 2.4% to 3.4% of global corporate income tax receipts.

The same study found limited evidence of job losses or investment flight among covered firms, undercutting a central argument critics had used for a decade. It examined companies just above and below the €750 million revenue threshold to isolate the effect of the rules.

Yet the picture is far from uniform. US federal corporate income tax receipts fell to $382 billion in fiscal 2026, down 16% in one year and $148 billion below fiscal 2024, according to the Congressional Budget Office. Corporate taxes supplied just 7.07% of federal receipts, down from 10.78% two years earlier.

That divergence, rising global minimum tax revenue alongside falling US corporate receipts, is the defining tax story of 2026. It shapes where multinationals book profits, how investors price tax exposure, and whether governments keep raising headline rates.

Key Takeaways

• The global minimum tax raised €79 billion to €109 billion ($90 billion to $124 billion) in its first year, or 2.4% to 3.4% of worldwide corporate income tax receipts.
• More than 60 jurisdictions have implemented the rules, which set a 15% effective tax rate for multinational groups with annual revenue above €750 million.
• Global corporate income tax revenues are expected to rise 3.2% to 5.4% per year, or $91 billion to $155 billion, according to the OECD.
• US federal corporate receipts fell to $382 billion in fiscal 2026, a 27.9% decline from $530 billion in fiscal 2024.
• US corporations paid an all-in 15.33% on 2025 book profits against a combined statutory rate of 25.57%, a realization ratio of about 60 cents per dollar.
• The average combined statutory corporate rate across 146 jurisdictions was 21.2% in 2026, down from 28.0% in 2000.

How Much Revenue Did the Global Minimum Tax Raise in 2026?

The OECD's 2026 assessment is the first based on observed company behaviour rather than modelling, which makes it unusually important. It covers the first year of implementation and compares firms on either side of the revenue threshold.

The headline number is a first-year gain of €79 billion to €109 billion. That is below the OECD's pre-implementation projection of $155 billion to $192 billion a year, but the gap is largely explained by the study covering only the first year and by behavioural adjustments still working through.

The forward estimate is more modest than early hopes. The OECD now expects the reform to add $91 billion to $155 billion annually, equivalent to a 3.2% to 5.4% annual increase in global corporate income tax revenues, rather than the earlier 6.5% to 8.1% range.

For investors, the key point is that the revenue is real and recurring. A 15% floor changes the arithmetic of profit shifting, because booking profits in a zero-tax jurisdiction no longer delivers a zero-tax outcome.

Why Are US Corporate Tax Receipts Falling While Global Revenue Rises?

The United States is the clearest exception to the global trend. Its federal statutory corporate rate has been 21% since 2018, and the combined federal plus state rate is about 25.53% in 2026, roughly in line with the OECD average.

But the headline rate is not what companies pay. US corporations paid an all-in 15.33% on 2025 book profits, only 0.33 percentage points above the global minimum rate. The realization ratio, which measures tax paid per dollar implied by the headline rate, fell to 59.9 in 2025 from 63.0 in 2024.

Policy also matters. A side-by-side arrangement negotiated by the Trump administration recognises the existing US minimum tax and exempts US-headquartered multinationals from key elements of the global regime. That reduces top-up tax paid to foreign governments, but it does not by itself explain the collapse in domestic receipts.

The bigger drivers are weaker corporate profit cycles, accelerated deductions and credits, and a lower effective burden on book income. The result is that the US collects less corporate tax as a share of GDP than at almost any point since the 1940s.

Key Figures: Headline Rates vs What Companies Actually Pay

Which Countries Are Winning and Losing From the 15% Floor?

The early winners are surprising. Guernsey, Jersey and other offshore hubs are projecting windfalls after raising their corporation tax rates to align with OECD rules, as multinationals have largely stayed put rather than fleeing.

That inverts the traditional tax-haven model. Instead of attracting profits with near-zero rates, these jurisdictions now collect top-up revenue from groups that remain physically and operationally present. The Financial Times reported in October 2026 that the expected exodus had not materialised.

Large economies with high headline rates have less to gain, because their effective rates were already near or above 15%. Countries that relied on preferential regimes for research, intellectual property or finance face the biggest adjustment.

In the European Union, the picture is stuck. The BEFIT proposal for a common corporate tax base remains formally pending as of September 2026, with negotiations stalled and the European Parliament calling for a narrower, step-by-step approach that is compatible with the OECD rules.

What Does the Global Minimum Tax Mean for Investors and Multinationals?

For investors, the most important consequence is that tax is becoming a more predictable but less negotiable cost. The 15% floor limits the upside from aggressive structuring, which reduces a source of earnings volatility but also removes a lever some companies used to lower effective rates.

Companies with effective rates already above 15% face little direct change. The exposure sits with groups that historically reported low single-digit effective rates through low-tax subsidiaries, particularly in technology, pharmaceuticals and intellectual property-heavy sectors.

Valuation effects are subtle. A higher floor can compress after-tax margins for affected firms, but it also levels the competitive field and reduces the risk of sudden legislative catch-up. Analysts should focus on disclosed effective tax rates and country-by-country reporting rather than headline statutory rates.

The US side-by-side arrangement adds a layer of uncertainty. If it holds, US-headquartered groups keep more favourable treatment than peers elsewhere. If it is challenged or unwound, those groups could face top-up taxes that markets have not fully priced.

What Does This Mean for Small Businesses and Domestic Companies?

Most small and mid-sized businesses are outside the scope of the global minimum tax, because it applies to groups with annual revenue above €750 million. A domestic company earning €20 million or €50 million will not file top-up returns under Pillar Two.

But the spillover is real. Large customers and suppliers are pushing tax transparency down their supply chains, and compliance and reporting costs rise for groups that cross the threshold. Smaller firms that are acquired by, or partner with, large multinationals may face new documentation requests.

The bigger risk for SMEs is indirect: if governments need revenue and large corporates are now taxed more effectively, attention can shift to domestic pass-through entities, payroll taxes and consumption taxes. Business owners should watch national budgets rather than the OECD text.

Will the US Side-by-Side Deal Weaken the Global Minimum Tax?

It could dilute the regime without dismantling it. The arrangement recognises the US minimum tax as equivalent, which means US-headquartered groups may not face top-up taxes in other countries on the same profits.

That creates an incentive for other governments to defend their tax base through domestic rules and to challenge the arrangement politically. The OECD's first-year study does not reflect the deal, because it covers 2024, so the long-run revenue figures remain uncertain.

The more likely outcome is a patchwork. The 15% floor stays in place for most multinationals, the US operates alongside it, and disputes move into treaty and trade channels rather than disappear.

Frequently Asked Questions (FAQ)

How much revenue did the global minimum tax raise in its first year?

The OECD estimated that the global minimum tax raised €79 billion to €109 billion ($90 billion to $124 billion) in its first year. That equals 2.4% to 3.4% of worldwide corporate income tax receipts. The estimate is based on observed company behaviour rather than modelling.

Did the global minimum tax cause job losses or less investment?

The OECD found limited evidence of any effect on investment or employment among covered firms. Companies above the €750 million revenue threshold saw higher effective tax rates, but did not visibly cut jobs or capital spending relative to comparable firms just below the threshold.

Why are US corporate tax receipts falling in 2026?

US federal corporate receipts fell to $382 billion in fiscal 2026, down 27.9% from $530 billion in fiscal 2024. Weaker profit cycles, credits and deductions, and a low all-in rate of 15.33% on book profits all contributed. The 21% federal statutory rate has been unchanged since 2018.

Which companies have to pay the global minimum tax?

The rules apply to multinational groups with annual revenue above €750 million. More than 60 countries and territories have implemented them. The tax requires an effective rate of at least 15% in every jurisdiction where the group operates.

Is the global minimum tax good or bad for investors?

It reduces the value of aggressive tax structuring, which can lower after-tax earnings for companies that relied on low-tax jurisdictions. But it also makes tax costs more predictable and limits the risk of sudden legislative changes. The net effect depends on each company's starting effective rate and disclosure quality.