94 lines
2.5 KiB
Python
94 lines
2.5 KiB
Python
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#!/usr/bin/python3
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''' Calculate SARS tax on payments '''
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import locale
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import math
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import re
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import sys
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tax_rates = [
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dict(
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rate = 18,
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low = 1,
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), dict(
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rate = 26,
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low = 205_901,
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), dict(
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rate = 31,
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low = 321_601,
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), dict(
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rate = 36,
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low = 445_101,
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), dict(
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rate = 39,
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low = 584_201,
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), dict(
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rate = 41,
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low = 744_801,
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), dict(
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rate = 45,
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low = 1_577_301,
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),
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]
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for r in tax_rates:
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idx = tax_rates.index(r)
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if idx < len(tax_rates) - 1:
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high = tax_rates[idx+1].get('low')
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r['high'] = high - 1
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else:
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r['high'] = False
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def error(e):
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if e:
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print(e);
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print("{0}: Please enter the annual or monthly amount before tax".format(sys.argv[0]))
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sys.exit()
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locale.setlocale( locale.LC_MONETARY, 'en_ZA.UTF-8' )
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locale._override_localeconv = {'mon_thousands_sep': ' ', 'mon_decimal_point': ','}
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currency = locale.localeconv()
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if len(sys.argv) < 2:
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error()
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elif isinstance(sys.argv[1], str):
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try:
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amount = "".join(sys.argv[1:]).strip(currency.get('currency_symbol'))
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amount = re.sub('[,.](\d{2})$','.\g<1>', amount) # convert decimal separator to .
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amount = re.sub('[ ,](\d{3})','\g<1>', amount) # convert thousands separator to ''
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amount = locale.atof(amount)
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amount = int(amount)
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except Exception as e:
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error(e)
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else:
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error()
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''' Are we dealing with a monthly amount or annual amount?
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Assume anything over R100k is annual.
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If earning more than 100k per month, convert to --month/--year commandline option
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'''
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if amount > 100_000:
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is_annual = True
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else:
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is_annual = False
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print("Notice: value {} determined to be per month, dividing tax rates by 12".format(amount))
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total_tax = 0
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for r in tax_rates:
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low = (r.get('low') - 1)
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high = r.get('high')
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rate = r.get('rate')
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if not is_annual:
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low = math.ceil(low/12)
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high = math.ceil(high/12)
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if amount >= low:
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bracket = amount
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if high and amount > high:
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bracket = high
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current = math.ceil(bracket - low)
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total_tax += math.ceil(current * rate / 100)
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print(" {:>6} - {:>6} = {:>6} / {} = {:>6}".format(bracket, low, current, rate, total_tax))
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if amount < high:
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break
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print("\nTotal tax on {} is {}".format(locale.currency(amount, grouping=True), locale.currency(total_tax, grouping=True)))
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