That would affect a much smaller percentage of people who are 18 to the same amount. €20k in taxes is how much you would pay if you were earning 65k/yr, or 5 times the average of what Spanish people under 25 earn.

Cutting taxes for this age bracket would effectively only help those who are already well off, which isn't the purpose of this proposal. Regardless of the discussion of whether or not you should give out 20k, your proposal doesn't address the same issue.

State would never come up with something that would make citizens less dependent on them.