nztax

#!/usr/bin/python3

import sys

salary = float(sys.argv[1])

tax = 0.0

tiers = [
    {"thresh": 14000, "rate": 0.105},
    {"thresh": 48000, "rate": 0.175},
    {"thresh": 70000, "rate": 0.3},
    {"thresh": float("inf"), "rate": 0.33},
]

for idx in range(len(tiers)):
    thresh = tiers[idx]["thresh"]
    rate = tiers[idx]["rate"]

    curlimit = min(salary, thresh)
    if idx > 0:
        tax += (curlimit - tiers[idx - 1]["thresh"]) * rate
    else:
        tax += curlimit * rate

    if salary < thresh:
        break

print("annual gross: " + str(salary))
print("monthly gross: " + str(round(salary / 12, 2)))
print("annual net: " + str(salary - tax))
print("annual tax: " + str(tax))
print("monthly net: " + str(round((salary - tax) / 12, 2)))
print("monthly tax: " + str(round(tax / 12, 2)))
print("effective rate: " + str(round(tax / salary * 100, 2)) + "%")