why my function doesn't work

[cimerio]

Hi, I am a beginner.

I need help. Why the code below doesn't return nothing?

def tax(year, value):
    if year > 2004:
        tax = value * 22 / 100
    else:
        tax = valor * 11 / 100


tax(2005, 100)

print (tax)

shows the error (or warning): <function tax at 0x00000000030F47B8>