Money & WorkFact
Your raise matches inflation and the state still takes more.
If wages rise with inflation while the brackets of a progressive tax schedule stay put, you slide into higher zones even though your purchasing power is unchanged. This bracket creep is called a hidden tax rise, because it works without any new law.
Useful: That is why governments periodically shift the schedule – without such an adjustment, the tax burden climbs by itself.
Source: de.wikipedia.org