Module 11 · Taxes
Income tax: brackets, marginal and average rates
How a progressive income tax works in slices, the difference between the marginal and the average tax rate, what an allowance is worth, and which country taxes you.
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In this lesson
- Compute income tax on a progressive scale, step by step
- Tell the marginal tax rate from the average tax rate, and explain why a raise never lowers net pay because of a bracket
- Explain what a tax allowance is worth at different marginal rates
- Describe tax residency and why it decides where you are taxed
Maja earns a good salary in Ljubljana. A friend says, “You’re in the 39% bracket, so the state takes 39% of everything you earn.” Is that how it works?
Income tax works in slices
A charges higher rates on higher slices of income. Think of buckets: the first bucket of your income is taxed at a low rate, the next at a higher rate, and so on. A is one of those bands of income with its own rate.
Before the scale is applied, most countries allow a : an amount of income on which you pay no tax. In Slovenia, the general allowance for 2026 is €5,551.93 a year. It reduces the income that is taxed.
The Slovenian scale for 2026 applies to the annual tax base, which is income after contributions and allowances:
| Annual tax base | Rate on this slice |
|---|---|
| Up to €9,721.43 | 16% |
| €9,721.43 to €28,592.44 | 26% |
| €28,592.44 to €57,184.88 | 33% |
| €57,184.88 to €82,346.23 | 39% |
| Above €82,346.23 | 50% |
Marginal and average rates
- The is the rate on your next euro.
- The is total tax divided by total income.
The average is always below the top marginal rate you reach. Moving into a higher bracket changes the rate only on the euros inside that bracket.
An allowance that reduces the tax base saves the allowance times your marginal rate. A €1,000 allowance saves €160 at 16% and €500 at 50%.
One real exception to “a raise never costs you”: some benefits shrink as income rises, such as child benefit or a subsidy with an income limit. In a narrow zone, the loss of a benefit can outweigh a small after-tax raise. That is a benefit rule, not a bracket effect.
Where you are taxed: residency
Most countries tax residents on their worldwide income and non-residents only on income earned locally. Residency usually depends on where you have a registered home, where your personal and economic interests are, or how many days you spend there. In Slovenia, a registered permanent home, a centre of life in the country, or more than 183 days a year can each make you resident. The US also taxes citizens wherever they live.
Two countries can claim the same person. A between them decides which country may tax what, so the same income is not fully taxed twice.
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