IB Economics Fighting Inequality Taxes & Transfers

Taxing Times: Progressive, Regressive, and Proportional Taxes Explained

Target Question:

What is the difference between progressive, regressive and proportional taxes?

The Pizza Example That Explains Everything

Imagine three people order the same large pizza. It costs £20.

Person A earns £200 a week. They pay £20 - that's 10% of their income. Person B earns £2,000 a week. They also pay £20 - that's just 1% of their income. Person C earns £200 a week. They pay £30 - 15% of their income - because they bought extra toppings that are taxed more heavily.

Now, which of these feels fair to you?

This extremely simple example basically captures the entire debate around how governments should tax people. And it shapes whether your grandparents get a decent pension, whether your school is properly funded, and whether the gap between the richest and poorest in society gets smaller or bigger over time.

Let's move on.

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The Three Tax Types

Progressive Taxes - The Rich Pay More (Proportionally)

Under a progressive tax system, the more you earn, the higher the proportion of your income you pay in tax. This means both paying more in absolute terms - and paying a bigger slice of your total income.

So, a progressive tax - is a tax system in which the proportion of income paid in tax increases as income rises. Higher earners pay a larger percentage of their income. Used to redistribute income and reduce inequality.

IB Economics Real-life Example: The UK's income tax system is the perfect example. For the 2025/26 tax year, no tax is charged on income up to the personal allowance of £12,570. The next £37,700 is taxed at 20%, income between £50,271 and £125,140 is taxed at 40%, and income above £125,140 is taxed at 45%.

Think of it like filling buckets. Your first £12,570 of earnings goes into a tax-free bucket. The next amount of earnings fills the 20% bucket. Only the income that goes over £50,270 hits the 40% rate. You never pay 40% on everything - just on the portion that crosses the set threshold. This is what economists mean by the marginal tax rate.

Progressive taxes are the tool for reducing inequality because they redistribute income from higher earners to fund public services and welfare programmes that benefit everyone - but disproportionately help those on lower incomes.

The statement "a progressive tax means workers pay more in taxes as their income rises" sounds like it could describe any tax system. And it's also true for proportional taxes. If you earn more and pay a flat 20%, you still pay more in absolute terms. What makes progressive taxes distinctly progressive is that the average rate also rises with income, not just the amount paid.

Regressive Taxes - The Poor Pay More (Proportionally)

Under a regressive tax system, lower-income individuals end up paying a higher proportion of their income in tax, even though the rate might look the same for everyone.

So, a regressive tax - is a tax system in which lower-income individuals pay a larger proportion of their income in tax than higher earners. VAT and excise duties are classic examples.

VAT - the UK's 20% Value Added Tax - is a good example. When you buy a bottle of shampoo, a train ticket, or a laptop, you pay VAT at the same rate regardless of whether you earn £15,000 or £150,000 a year. But that 20% bites much harder on a low earner, because spending takes up a bigger chunk of their income than it does for wealthy households who save more.

The same goes for petrol taxes, alcohol duties, and toll roads. A £1-per-litre fuel duty is the same for the minimum wage delivery driver and the company director - but it represents a far larger proportion of the delivery driver's income.

This is why indirect taxes are frequently criticised for being inequitable, even when they're officially communicated as being the same for everyone.

Proportional Taxes - The Flat Tax

Proportional taxes - also known as flat taxes - apply a single fixed rate to all taxpayers regardless of income. If the rate is 20%, you pay 20% whether you earn £20,000 or £2,000,000.

So, a proportional tax (flat tax) - is a single fixed tax rate applied equally to all taxpayers regardless of income. Hungary's 15% flat tax and Latvia's former 23% flat tax are common IB Economics examples.

Hungary introduced a 15% flat income tax in 2011. Latvia implemented 23% in 2009. Supporters argue flat taxes are simpler, fairer in a formal sense, and reduce disincentives to earn more. Critics argue they don't do enough to address inequality, because a 15% rate hurts a low earner far more in terms of their living standard than it does a high earner.

Marginal vs Average Tax Rates (HL Students, Pay Attention)

This is the section that HL students need to get really comfortable with, because calculation questions come up regularly.

Marginal Tax Rate (MTR) = ∆T ÷ ∆Y

This is the tax paid on the last pound earned - the rate at which your tax bill increases as your income increases. Under the UK system, if you cross the £50,270 threshold, the next pound you earn is taxed at 40%. That's your marginal rate.

So, a marginal tax rate (MTR) - is the percentage of tax paid on the last unit of income earned. Calculated as ∆T ÷ ∆Y. Under a progressive system, the MTR rises as income rises.

Average Tax Rate (ATR) = T ÷ Y

This is your total tax bill as a proportion of your total income. If you earn £60,000 and pay £11,432 in income tax (which is roughly the 2025/26 figure for England), your average rate is about 19% - even though your marginal rate on the top portion of your income is 40%.

So, an average tax rate (ATR) - is the total tax paid as a proportion of total income earned. Calculated as T ÷ Y.

The key exam relationship:

• Progressive tax system: MTR > ATR (the marginal rate exceeds the average rate, pulling the average up as income rises)

• Regressive tax system: ATR > MTR (the average rate exceeds the marginal rate)

This is the kind of precise distinction that separates a 6 from a 7 at IB Economics.

Direct vs Indirect Taxes: Two Different Routes to the Same Destination

Direct Taxes

A direct tax is levied directly on income or wealth - the person who earns the money pays the tax.

The main types are:

Personal income tax - taxes your wages, salary, and most other earned income. It funds public services and healthcare but can discourage work if tax rates are set too high. The right balance needs to be applied.

Corporate income tax - levied on the annual profits of businesses. It helps redistribute income but, if set too high it leaves firms with less capital to reinvest, pay dividends, or hire workers. This is another trade-off governments wrestle with every Budget.

Wealth taxes - levied on the market value of assets an individual or household ownership. Inheritance tax in the UK is the most obvious example. These are increasingly controversial - from April 2026, inheritance tax relief available for agricultural and business property became restricted, triggering significant debate over how many farms and businesses it would affect.

Indirect Taxes

An indirect tax is a tax on expenditure rather than income. VAT, customs duties on imports, and Pigouvian taxes (levied on demerit goods like alcohol, cigarettes, and petrol) all fall into this category.

The logic is that wealthier individuals and households spend more in absolute terms, so they pay more indirect tax too - which provides some redistributive effect. But as we've already established, the proportional burden still falls harder on low earners, which is why indirect taxes remain controversial from an equity standpoint.

IB Economics tip: when recommending policies to reduce inequality, always acknowledge the opportunity cost. Redistributing income through progressive taxes involves administrative costs, potential disincentives to work and invest, and political trade-offs. There's no free lunch in economics - and this topic is no exception.

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Beyond Taxes: The Full Toolkit for Reducing Poverty and Inequality

Taxation is an important instrument, but it's not the only tool governments have. There are a whole range of additional policies, and IB Economics examiners are looking for you to show awareness of all of them.

Human Capital Investment and Tax Breaks

Giving tax relief to low-income earners and families with young children reduces their tax burden directly - and in some cases qualifies them for a refund. More broadly, investing in education and training builds the human capital that allows workers to become more productive, earn higher wages, and escape poverty. Results are often seen in the long-term, but it works.

Transfer Payments

These are perhaps the most direct anti-poverty tool available to governments. Transfer payments are sums of money paid from the government to individuals without any corresponding output - unemployment benefits, disability allowances, student loans, state pensions, and housing allowances.

They're effective, but they come with real costs. Transfer payments are expensive, can contribute to budget deficits, and have opportunity costs - every pound spent on a welfare payment is a pound that can't be spent elsewhere.

Targeted Spending

Rather than spreading resources thinly across the whole population, governments can direct spending exactly where it's needed. Funding primary education in deprived areas to achieve full child literacy is one example. Conditional Cash Transfers (CCTs) are another - payments to low-income families on the condition that they meet requirements like keeping children in school and attending regular healthcare visits.

So, conditional Cash Transfers (CCTs) - government payments made to low-income households on the condition that recipients meet certain requirements, such as school attendance or healthcare visits, aimed at breaking the poverty cycle.

IB Economics Real-life Example: Mexico's Oportunidades programme and Brazil's Bolsa Família are two of the most studied CCT programmes in the world, both showing strong results in reducing intergenerational poverty.

Universal Basic Income (UBI)

UBI is one of the policies that generates considerable debate in contemporary economics.

The idea: everyone in the country receives a guaranteed minimum income from the government, unconditionally, regardless of whether they work or not. No means test. No bureaucracy. No psychological profiling necessary. Just money, every month, to every citizen.

Proponents argue it eliminates the poverty trap, gives workers bargaining power, and provides a safety net in an era when automation is threatening millions of jobs. Sceptics worry it's unaffordable, could reduce work incentives, and might simply drive up inflation.

So, the universal Basic Income (UBI) - is a guaranteed minimum income paid by the government to every citizen regardless of employment status, with no means test or work requirement.

IB Economics Real-life Example: Real-world testing is ongoing. Wales launched a three-year pilot in July 2022 paying £1,600 per month before tax to young people leaving the care system. Mid-trial findings showed the guaranteed income allowed participants to lead more balanced personal lives and pursue educational opportunities, with many reporting improved mental health. In England, pilots are being trialled in Jarrow in the north-east and East Finchley in north London. Over 38 UBI pilots have taken place across Europe, North America and Asia since 2015, with studies suggesting broadly positive effects on employment outcomes and individual wellbeing - though the evidence remains limited and most pilots are not truly unconditional and universal.

As of 2026, no country has implemented a full nationwide UBI. But the conversation is accelerating - particularly as AI-driven automation puts more pressure on labour markets.

Anti-Discrimination Policies

Social exclusion based on gender, ethnicity, disability, or sexual orientation is a major driver of poverty and inequality. Governments can directly address this through anti-discrimination legislation and by actively promoting equality of opportunity. In economic terms, eliminating discrimination apart from being morally right - it's efficiency-enhancing, because it unlocks productive potential that is currently going to waste.

Minimum Wages

The minimum wage sets a legal floor on pay - the lowest hourly rate an employer can legally pay. In the UK, the National Living Wage for workers aged 21 and over increased to £12.21 per hour in April 2025.

The theory: it boosts incomes for the lowest earners, reduces dependence on transfer payments, and creates stronger work incentives.

What it might not be right: it raises labour costs for businesses, which can reduce hiring - particularly in the short run. Setting a national minimum wage is also genuinely complicated when the cost of living varies so dramatically between, say, central London and rural Lincolnshire. A wage that feels generous in one place may barely cover basics in another.

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IB Economics Summary

Every policy to reduce poverty and inequality involves trade-offs.

Progressive taxes redistribute income effectively, but if set too high, they can discourage work, deter investment, and push high earners to relocate. Transfer payments support the poorest households but cost money and create budget pressures. UBI is potentially transformative but hugely expensive and untested at scale. Minimum wages help low earners but risk increasing unemployment in the short run.

So today you may have learnt that economic policymaking offers no clean solutions. Instead, you may see contested choices between competing values and interests. The job of an IB Economics student is not to list these trade-offs, but to identify them, weigh them up, and make a reasoned judgement about which approach best serves the goals of reducing poverty and inequality in the given economic context.

That, more than anything, is what IB Economics examiners are looking for.

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Frequently Asked Questions

Q: What is the difference between progressive, regressive and proportional taxes? A progressive tax takes a higher proportion of income from higher earners. A regressive tax takes a higher proportion from lower earners, even if the rate looks the same (like VAT). A proportional (flat) tax takes the same percentage from everyone regardless of income.

Q: Why is VAT considered a regressive tax? VAT charges the same rate to all consumers, but lower-income households spend a greater proportion of their income, so the tax takes up a bigger share of their earnings than it does for wealthier households. This makes it regressive despite being a flat rate.

Q: What is the difference between the marginal and average tax rate? The marginal tax rate (MTR) is the tax paid on the last pound of income earned (∆T ÷ ∆Y). The average tax rate (ATR) is total tax paid as a proportion of total income (T ÷ Y). Under a progressive system, MTR exceeds ATR. Under a regressive system, ATR exceeds MTR.

Q: What is Universal Basic Income and does it work? UBI is a guaranteed minimum income paid to every citizen regardless of work status. Pilots in Wales, Germany, Finland, and parts of the US have shown improvements in wellbeing and education outcomes. However, no country has implemented a full national UBI due to funding concerns and uncertain employment effects.

Q: What is a conditional cash transfer and how does it reduce poverty? A CCT is a government payment to low-income households conditional on meeting requirements such as school attendance or healthcare visits. It provides immediate income support while also building long-term human capital, helping to break the intergenerational poverty cycle. Brazil's Bolsa Família and Mexico's Oportunidades are the most widely studied examples.

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