N.K.M v. Hungary, ECtHR, 14 May 2013, read judgment
Those of a certain age will remember when top tax rates in the UK were 98%. This was the marginal rate of tax in this successful claim that such taxation offended Article 1 of the 1st Protocol (A1P1) – the peaceful enjoyment of possessions. But the very wealthy seeking to safeguard their bankers bonuses may not obtain too much comfort from the Strasbourg ruling, as the facts were fairly extraordinary.
The applicant had been a Hungarian civil servant for 30 years until her dismissal (with many others) in July 2011. Long-standing rules gave her 8 months severance pay. The 98% tax rate was introduced in 2010; it was then successfully challenged in the Hungarian Constitutional Court. On the day of the Court’s adverse judgment, the tax was re-enacted, but this time the 98% rate was applied to pay exceeding 3.5m forints – c. £10,000 – and, further, only where the earnings came out of specified categories of public sector employees.
A fresh challenge in the Constitutional Court annulled the retrospective effect of this law, but could not as a matter of jurisdiction review the substantive aspects of the tax. So the applicant went to Strasbourg to challenge the tax when deducted from her pay.

