The parliamentary financial evaluation committee has already declared it as unconstitutional.
For those that still manage to save some of their income – a luxury for very few nowadays – the plans to tackle this were already though out. For example, a large purchase of a high end tv at the last day of the year, which then would be returned a couple days unopened. The ministry would be “happy” and your savings would not really have exchanged hands permanently.
It mostly illustrates the inability of the government to be effective.