Rules, explained one at a time
A calculator page answers "what do I take home". These pages answer the narrower question someone actually searched: what exactly is this one rule, and why does it work that way. Each one names a specific threshold, rate or mechanism, explains it in full, and links to the live calculator that computes it.
- Why UK earners over £100,000 face a 60% marginal rate Between £100,000 and £125,140 of income, the UK's £12,570 tax-free personal allowance withdraws at £1 for every £2 earned, disappearing entirely at the top of the band.
- How Estonia's new car tax charges for CO₂ and weight Estonia's motor-vehicle tax, introduced in 2025, is a flat base plus 3 EUR (annual) or 5 EUR (registration) for every gram of CO₂ above a 117 g/km threshold, plus a mass charge above 2,000 kg.
- Poland's 9% health premium: a deduction from pay, not from tax Poland's 9% employee health-insurance contribution (składka zdrowotna) is charged on income after ZUS deductions but, since 2022, can no longer be offset against PIT — it reduces net pay directly rather than reducing taxable income.
- Poland has no annual car tax — but a one-time excise with a cliff at 2,000cc Poland levies no annual car-ownership tax; instead, a one-time excise (akcyza) applies when a car is first registered, at 3.1% of value for engines up to 2,000cc and 18.6% above — a six-fold jump right at the threshold.
- Why childless employees over 23 pay more into German care insurance German long-term-care insurance is charged at 1.8% of pay up to its contribution ceiling, plus a 0.6-percentage-point surcharge on employees over 23 who have no children — a policy tied to the insurance's reliance on future generations of contributors.