Tax Brackets Explained: A Country-by-Country Guide to Progressive Income Tax

A tax bracket is a range of income taxed at a specific rate. Under a progressive system, only the income within each band is taxed at that band's rate — not all income below it. If the first 20,000 of income is untaxed, the next 30,000 taxed at 20%, and anything above at 40%, a person earning 60,000 pays nothing on the first 20,000, 6,000 on the middle slice, and 4,000 on the top 10,000 — a total of 10,000, not the 24,000 that applying 40% to everything would imply.

This is one of the most common misunderstandings about income tax. The top rate that applies to any part of income is the marginal rate — it does not apply to income below the threshold. Progressive systems are designed so that earning more never leads to lower absolute take-home pay. Knowing only the top bracket rate therefore tells you very little about the actual tax burden at a given salary level.

The marginal rate is the rate on the next unit of income. The effective rate is total tax paid divided by total income. Both are useful, but for different decisions. If you are evaluating a pay rise or side income, the marginal rate tells you what proportion of the extra earnings you will keep. If you are comparing total burden against a colleague in another country, the effective rate is the right metric.

At €80,000 gross in Germany in 2025, the marginal income tax rate is 42%. But the effective rate — total income tax divided by total gross — is typically around 26–30%, because the lower brackets were taxed at much lower rates. Comparing Germany's 42% marginal rate with France's 41% or the UK's 40% is therefore less meaningful than comparing effective rates at equivalent income levels, which NettoFlow calculates directly.

The number of brackets and threshold levels vary significantly. The UK uses three bands — 20%, 40%, and 45% — with a tax-free personal allowance of £12,570. France uses five bands, with the top rate of 45% applying from €177,106. Switzerland has no discrete steps at the federal level: federal income tax is calculated from a continuous progression formula, and cantonal and communal taxes are then added, making the effective rate depend on the precise income and municipality.

Some countries use unusual structures that interact with the bracket system. Germany's progression is mathematically continuous: the marginal rate rises smoothly from 14% to 42% within the main income range rather than jumping at fixed thresholds. The Netherlands combines a flat rate in the main band with tax credits that taper with income, creating effectively higher marginal burdens at mid-range incomes than the headline rate implies. Australia, Canada, and the US each stack federal and state or provincial rates to produce the final marginal figure.

Bracket information is most useful in specific decision contexts. When evaluating a pay rise from €90,000 to €100,000, knowing the marginal rate at that income level tells you exactly how much of the additional €10,000 you will see in take-home pay. The same logic applies when deciding whether to exercise stock options in a given year. Bracket thresholds — the specific incomes at which the rate steps up — are worth knowing because timing income across tax years can sometimes reduce the total burden.

For country comparisons at a given salary level, the effective rate is more informative than bracket charts alone. A country with many brackets and a high top rate may have a lower effective rate than a country with two brackets and a moderate top rate, depending on where the thresholds sit. NettoFlow computes both the marginal rate at the entered salary and the effective rate after all applicable deductions and contributions, allowing direct comparison across any of the 25 covered countries.