Taxation: Who Pays, On What, and Why Systems Differ

Buy the same loaf of bread in Berlin, Mexico City or Lagos and a slice of the price goes to the state, but the slice is collected in very different ways. The standard rate of value-added tax is 19 percent in Germany, 16 in Mexico and 7.5 in Nigeria (PwC, 2026), each with its own list of reduced rates and exemptions. In the United States there is no national sales tax at all, though most states add their own at the till. The shop, the baker and the bread are the same. The system that gets a share out of them is a choice a society made.

A person who has studied taxation stops asking "is this tax too high?" as a first question. They ask what it is a tax on, who sends the money to the state (which is often not who ends up bearing it), and what the state can actually observe. Those three questions explain more of the world's tax systems than any list of rates.

Not tax or legal advice. This describes how tax systems work and how they differ. Taxes change every year and depend on the person and the country. Rates below are dated, and the taxpayers and companies in the examples are invented. For your own taxes, use the tax authority or a qualified adviser in your country.

Four things to tax, and what a state can see

Almost every tax in the world falls on one of four bases. Income: what people and firms earn, taxed as personal income tax, corporate tax and, in many countries, social-security or payroll contributions. Consumption: what people spend, taxed through VAT or GST, sales taxes and excise duties on fuel, tobacco and alcohol. Property and wealth: land, buildings, inheritances and, rarely, net wealth. Trade: tariffs, which in poorer countries are historically a large share of revenue. Each country mixes them differently.

Adam Smith set out four tests for a tax in The Wealth of Nations (1776, Book V): equality, certainty, convenience and economy of collection. Modern debates follow the same fault line: the ability-to-pay view says those with more should pay a larger share, and the benefit view says taxes should resemble prices for what the state provides. Economists can measure how much a tax changes behaviour; which fairness view to adopt is a values choice that societies settle politically.

How much is collected differs a great deal. The OECD's Revenue Statistics 2025 puts the average tax-to-GDP ratio of its 38 member countries at 34.1 percent in 2024 (preliminary, a record), with Denmark highest at 45.2, France second at 43.5 and Mexico lowest at 18.3.

Tax revenue as a percentage of GDP, 2024, OECD Revenue Statistics 2025 (includes social-security contributions). Bars are drawn from the printed values.

Why is Mexico's collection so far below Denmark's? Part is policy, but part is what the state can see. Income that passes through a payroll and is reported to the tax authority by a third party is hard to hide; cash income of a small business or a farm is not. The US Internal Revenue Service's estimates show the pattern: for tax year 2021 it projected a gross tax gap of about $688 billion, a voluntary compliance rate of about 85 percent, and much higher compliance where income is reported by third parties, and higher still where it is also withheld. Informal economies matter even more where the share of the workforce outside payroll is large. This is why so many countries lean on VAT, which leaves a paper trail at every stage.

A look at headline rates shows both the similarities and the spread. These are statutory rates, not what people pay on average, and the top personal rate applies above a threshold that differs hugely between countries.

Country	Top personal income rate	Corporate (headline)	VAT / GST (standard)
United States	37%	21% federal	none (state sales taxes)
United Kingdom	45%	25%	20%
Germany	45% + surcharges	15.825% + trade tax	19%
France	45% + surtax	25%	20%
Mexico	35%	30%	16%
Brazil	27.5%	34%	no single rate (reform under way)
Chile	40%	25% or 27%	19%
Colombia	39%	35%	19%
Japan	45% + 2.1% surtax	23.2%	10%
China	45%	25%	13%, 9% or 6%
India	39% with surcharge and cess (new regime)	25% or 30% + surcharge, cess	GST, 18% the general rate
South Africa	45%	27%	15%
Nigeria	25%	30% (large firms)	7.5%
Kenya	35%	30%	16%
Australia	45%	30%	10%

Source: PwC Worldwide Tax Summaries quick charts, country pages reviewed between April and October 2026. Brazil's reform replaces five consumption taxes with a dual VAT in stages between 2026 and 2033. Top personal rates exclude local taxes and, mostly, social contributions. The table is a picture of 2026, not a guide.

Marginal versus average: how a schedule works

A progressive income tax does not tax your whole income at the top rate. It applies each rate only to the slice of income inside that bracket. The marginal rate is the rate on your next unit of income. The average rate is total tax divided by total income. Because lower slices are taxed at lower rates, the average always trails the marginal rate in a progressive schedule. Confusing the two is the source of the myth that a raise can leave you with less after tax: it cannot, because only the extra slice is taxed more.

Systems also differ in shape. A flat tax with a generous allowance (Estonia taxes personal income at a flat 22 percent according to PwC's 2026 chart, Hungary at 15) is also progressive in effect, because the allowance makes the average rate climb toward the flat rate. A capped payroll contribution does the opposite: the same rate up to a ceiling, and nothing above, which makes it regressive at the top. Real schedules often combine both.

Without JavaScript: on the brackets, income of 60,000 pays 8,000 (0 + 3,000 + 5,000), an average of 13.3 percent against a marginal 25 percent. The flat-with-allowance schedule takes 7,200 (average 12 percent). The capped contribution takes 6,000 (10 percent), and at 200,000 only 3 percent on average.

Britain introduced an income tax in 1799 to fund the wars against France, repealed it in 1816 and revived it in 1842; the US federal income tax was enabled by the Sixteenth Amendment in 1913.

VAT: a tax on value added, collected in pieces

A value-added tax is levied at every stage of production, but each seller remits tax only on the value it added. The seller charges VAT on its sale price and subtracts the VAT it paid on its purchases (the input credit), sending the state the difference. The credit-invoice design was set out by the German industrialist Wilhelm von Siemens in 1918 and put into law by the French tax official Maurice Lauré in 1954. Today around 175 of the 193 UN member states have a VAT or GST; the United States is the only OECD member without one. The European Union requires a standard rate of at least 15 percent.

Three properties make it popular with finance ministries. It taxes consumption, not saving or exports (exports are zero-rated: the seller can reclaim input tax). It is collected in pieces, so no single seller holds the whole tax. And every credit claim is matched by someone else's invoice, a paper trail the authority can cross-check. Its weakness is that poor households spend a larger share of income than rich ones, so many countries use reduced rates or rebates; whether reduced rates are the best way to help the poor is argued, since the rich eat bread too.

Without JavaScript: at 20 percent, the four sellers remit 6, 4, 6 and 4, a total of 20, which is 20 percent of the final price of 100. If the baker is exempt, nobody claims credit after that point and the state collects 30, with 10 of it a hidden cost on the baker's side.

The exempt-baker case is the lesson of the interactive: exempt is not zero-rated. An exempt seller charges no VAT but cannot recover the VAT on its inputs, so tax is "stuck" in the price and compounds. A zero-rated seller charges 0 percent and can reclaim. This is why exempting a stage in the middle of a chain is not a gift to the buyer.

Corporate tax: where is profit earned?

A company's taxable profit is a legal construct, not a fact in the world. A multinational has sales in one country, factories in another, a patent held in a third, and the question "where was this profit earned?" has no unique physical answer. The old rule, written into the OECD Model Tax Convention and the OECD Transfer Pricing Guidelines, is the arm's-length principle: prices between a group's own companies should be those independent parties would have agreed. That is simple to say and hard to apply for unique things like brands and software, where there is no comparable independent price.

Governments compete with their rates. The headline rate in 2026 ranges from 9 percent in Hungary and 12.5 percent on Irish trading income to 35 percent in Argentina and Colombia (PwC). A company can lower its global bill by arranging for deductible payments, such as royalties and interest, to flow to low-tax members of the group. The OECD's response is "Pillar Two", a 15 percent global minimum tax on large groups: 137 countries and jurisdictions agreed its outline in October 2021, the EU adopted a directive in December 2022, and many countries began applying it from 2024. In January 2026 the Inclusive Framework agreed a "side-by-side" arrangement under which US-headquartered groups are left to US minimum-tax rules and exempted from the Pillar Two top-up rules. Supporters say a floor ends the race to the bottom; critics say competition will move into subsidies and that the exemption weakens it. It is live and changing.

Without JavaScript: with no royalty the group pays 30 on 100 (30 percent). With a royalty of 60 it pays 12 + 6 = 18 (18 percent). With a 15 percent minimum, the low-tax profit of 60 is topped up from 10 to 15 percent, adding 3, so the group pays 21 (21 percent).

Not all rate gaps are avoidance: a firm may simply build a factory where labour is cheaper and tax is lower. The line between lawful planning, aggressive avoidance and evasion (illegal concealment) differs by country and changes with the law.

Wealth and property: taxing stock, not flow

Income is a flow (what arrives in a year). Wealth is a stock (what you hold on a date). A property tax and a wealth tax tax the stock, often at a low rate that is nonetheless large in relation to the flow the asset yields. The arithmetic is worth seeing once. A 1 percent annual tax on assets that return 4 percent is, from the owner's side, a 25 percent tax on that return. If the assets return 2 percent that year it is a 50 percent tax, and if they return nothing, the tax is paid out of capital.

Without JavaScript: a 1 percent wealth tax on a 4 percent return leaves 3 percent after tax, which equals a 25 percent income tax on the return. At a 2 percent return the equivalent rate is 50 percent.

Wealth taxes sit at the centre of a live debate. In 1990 about a dozen OECD countries had a recurring net wealth tax; by the late 2010s only about five did (Colombia, France, Norway, Spain and Switzerland in 2021 by one count), and France replaced its wealth tax (ISF, 1989 to 2017) with a tax on real estate wealth (IFI) from 2018. Several Latin American countries (Colombia and Argentina, for instance) levy one, with rates that have been revised often. Their revenue is usually small: net wealth taxes were about 1.1 percent of tax revenue in Norway and 3.6 percent in Switzerland in 2017.

Each side has a case. Supporters, including Thomas Piketty (Capital in the Twenty-First Century, 2014) and Emmanuel Saez and Gabriel Zucman, argue that wealth is far more concentrated than income, that it escapes the income tax when gains are not realised, and that a coordinated design could raise meaningful revenue. Critics argue that valuing illiquid assets is hard, that owners can move, restructure or exempt assets, that many countries tried and abandoned the tax, and that taxing capital reduces investment. The evidence from the countries that ended their taxes is itself contested. The older and more widespread version of taxing the stock is the property tax on land and buildings. Henry George's Progress and Poverty (1879) argued for taxing land value alone, since land cannot be made or moved; many economists of different schools agree on its efficiency, and the political difficulty is that land is where people live.

Residence, source and treaties: who taxes first

When income crosses a border, two countries may claim it. The source country says: it was earned here. The residence country says: you live here. Most countries tax their residents on worldwide income and non-residents only on what is earned inside the country. The United States is unusual in also taxing its citizens on worldwide income wherever they live. A territorial system exempts most foreign income instead. The same euro can end up taxed twice unless something steps in.

That "something" is a network of bilateral tax treaties, mostly built on the OECD Model Convention or the UN Model (which gives a bit more to source countries), and the two relief methods inside them. With exemption the residence country ignores the foreign income. With a credit it taxes the income but subtracts the foreign tax already paid, so the investor ends up paying the higher of the two rates. Without relief, the rates add.

Without JavaScript: with B at 20 and A at 30, no relief takes 50, a credit takes 30 (20 to B and 10 to A) and exemption takes 20.

Treaties also settle who may tax what: how long a worker must be present before the source country can tax wages, when a company has a "permanent establishment" in a country, and rates on dividends, interest and royalties. They do not remove the problems of the previous sections; they are where those problems become law.

What a graduate just sees

• Every tax is a tax on something (income, spending, assets, trade), and the mix differs by country.
• The marginal rate is the rate on the next unit; the average is always lower in a progressive schedule.
• A state can only tax what it can see, which is why third-party reporting, withholding and VAT invoices matter more than the statutory rate.
• VAT charges tax on value added at each stage; exempt is not the same as zero-rated.
• "Where profit is earned" is a legal convention, so rate gaps invite shifting and floors invite new games.
• A small tax on a stock is a large tax on its yield.
• Treaties decide who taxes first, and relief is by credit or exemption.

Where it shows up next

• Corporate Finance (34/51): interest is deductible and dividends are not in most systems, which is why debt looks cheap and why capital structure is a tax question too.
• International Trade & Finance (34/47): tariffs, border adjustments on VAT and the way tax rates steer capital flows.
• Public Economics (34/49): the incidence and deadweight-loss ideas that tell you who bears each tax in the end.
• Business Law & Ethics (34/55): where legitimate planning ends and avoidance schemes, penalties and disclosure rules begin.
• In the world: payslip deductions, the price tag at the till, the headline about a minimum tax, and the debate over whether a carbon tax is better than regulation (see Environmental Economics & Policy, 36/19).

If you want to go deeper

• 📘 Textbook. Joel Slemrod and Jon Bakija, Taxing Ourselves: A Citizen's Guide to the Debate over Taxes (MIT Press), the standard policy introduction; and for a US compliance course, South-Western Federal Taxation or Pearson's Federal Taxation. For comparing systems, the OECD's Revenue Statistics and Consumption Tax Trends series. Check for current editions.
• 📘 Gentler. Emmanuel Saez and Gabriel Zucman, The Triumph of Injustice (2019), a readable and openly argued case for a more progressive US system. Read it with a critic, such as the work of the Tax Foundation or the Institute for Fiscal Studies' Mirrlees Review (2011), which is a careful, mainstream design document.
• 🌐 Free text. The IFS Mirrlees Review, Tax by Design (2011), is free at ifs.org.uk, and PwC's Worldwide Tax Summaries is a free per-country reference.