calculate taxes in the netherlands for 2019-2020

taxes20192020nl.py

#2019

def labor2(x):
    if x <= 9694:
        return 0.01754 * x
    elif x <= 34060:
        return min(3399.0, 0.01754 * 9694 + 0.28712 * (x - 9694))
    elif x <= 90710:
        return 3399.0 - 0.06 * (x - 34060)
    else:
        return 0.0
def general2(x):
    if x <= 20384:
        return 2477.0
    elif x <= 68507:
        return 2477.0 - 0.05147 * (x - 20384)
    else:
        return 0.0
def rate2(x):
    if x <= 20385:
        return 0.3665 * x
    elif x <= 68508:
        return 0.3665 * 20385 + 0.3810 * (x - 20385)
    else:
        return 0.3665 * 20385 + 0.3810 * (68508 - 20385) + 0.5175 * (x - 68508)
total2 = lambda x: rate2(x) - labor2(x) - general2(x)
total2 = lambda x: max(0, rate2(x) - labor2(x) - general2(x))
totalp2 = lambda x: total2(x) / x * 100
ratep2 = lambda x: rate2(x) / x * 100
generalp2 = lambda x: general2(x) / x * 100
laborp2 = lambda x: labor2(x) / x * 100
total302 = lambda x: total2(x * 0.7) if x >= 37743 else total2(x)
totalp302 = lambda x: total302(x) / x * 100
def draw(fns, something='taxes'):
    import matplotlib.pyplot as plt
    fig = plt.figure()
    ax = fig.add_subplot(111)
    x_points = range(1,200000)
    for fn in fns:
        y_points = map(fn, x_points)
        p = ax.plot(x_points, y_points, 'b')
    ax.set_xlabel('salary')
    ax.set_ylabel(something)
    ax.set_title(something)
    fig.show()

# 2020

def labor(x):
    if x <= 9912:
        return 0.02812 * x
    elif x <= 21430:
        return 0.02812 * 9912 + 0.28812 * (x - 9912)
    elif x <= 34954:
        return 0.02812 * 9912 + 0.28812 * (21430 - 9912) + 0.01656 * (x - 21430)
    else:
        return max(0, 0.02812 * 9912 + 0.28812 * (21430 - 9912) + 0.01656 * (34954 - 21430) - 0.06 * (x - 34954))

def general(x):
    if x <= 20711:
        return 2711.0
    elif x <= 68507:
        return 2711.0 - 0.05672 * (x - 20711)
    else:
        return 0.0
def rate(x):
    if x <= 68507:
        return 0.3735 * x
    else:
        return 0.3735 * 68507 + 0.4950 * (x - 68507)
total = lambda x: max(0, rate(x) - labor(x) - general(x))
totalp = lambda x: total(x) / x * 100
ratep = lambda x: rate(x) / x * 100
generalp = lambda x: general(x) / x * 100
laborp = lambda x: labor(x) / x * 100
total30 = lambda x: total(x * 0.7) if x >= 38347 else total(x)
totalp30 = lambda x: total30(x) / x * 100
draw([totalp30, totalp302], something='tax percentage')