The tax situation in Japan is a serious matter. It put Japan in a worse recession. It will likely affect elections, with abe not having as much support.
Reasons:
1: Tax increases are rare in Japan.
2: The Tax increase was quite sizeable, and coupled with 1 makes it worse.
3: The Tax increase was across the board, unlike in lots of western countries where you can buy food without much tax.
They are at 8% and people fear 10% will come, which is only half of major european countries.