This is also a problem in the US if you manage to just cross a tax bracket.
Well, it would be, if the US adopted a tax bracket with a > 100% marginal rate. But it hasn't, so it doesn't. Though its a persistent myth, because people don't understand marginal tax rates and confuse them with total tax rates. (Or, for a similar problem, as illustrated in another subthread, don't understand the related concept of how deductions phase out before you reach the point where they are no longer available.)