个人所得税计算脚本

salary = 20000  #工资
kouchu = 3000   #五险一金
fujia = 2000    #附加扣除（教育，医疗，养老等）

i = 1
arr = []
brr = []
while i <= 12:
    e = (salary - kouchu -fujia - 5000) * i
    if 0 < e <= 36000:
        k = e * 0.03
    elif 36000 < e <= 144000:
        k = e * 0.1 - 2520
    elif 144000 < e <= 300000:
        k = e * 0.2 - 16920
    elif 300000 < e <= 420000:
        k = e * 0.25 - 31920
    elif 420000 < e <= 660000:
        k = e * 0.3 - 52920
    elif 660000 < e <= 960000:
        k = e * 0.35 - 85920
    elif e > 960000:
        k = e * 0.45 - 181920
    else:
        k = 0
    tax = k - sum(arr)
    arr.append(tax)
    s = salary - kouchu - tax
    brr.append(s)
    i += 1

print([round(i,2) for i in arr])
print([round(i,2) for i in brr])

输出结果：
[300.0, 300.0, 300.0, 580.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0, 1000.0]

[16700.0, 16700.0, 16700.0, 16420.0, 16000.0, 16000.0, 16000.0, 16000.0, 16000.0, 16000.0, 16000.0, 16000.0]