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ys
2024-12-20 21:50:09 +00:00
parent 6dc40ba6af
commit d3dc84416d
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490
code/misc/python/scripts/tax calculator.ipynb Normal file
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{
"cells": [
{
"cell_type": "code",
"execution_count": 37,
"metadata": {},
"outputs": [],
"source": [
"incometax_bands=[(0,37500,0.2),(37500,150000,0.4),(150000,1e9,0.45)]\n",
"NI_bands=[(0,8632,0),(8632,50000,0.12),(50000,1e9,0.02)]\n",
"NI_bands_emp=[(0,8632,0),(8632,1e9,0.138)]\n",
"dividends=[(0,2000,0),(37500,150000,0.4),(150000,1e9,0.45)]"
]
},
{
"cell_type": "code",
"execution_count": 38,
"metadata": {},
"outputs": [],
"source": [
"weekly\n",
"daily_rate=950\n",
"gross_salary=lambda x:daily_rate*x\n",
"incometax= lambda x: taxcalc(x,incometax_bands) \n",
"employeeNI= lambda x: taxcalc(x,NI_bands) \n",
"employerNI= lambda x: taxcalc(x,NI_bands_emp) "
]
},
{
"cell_type": "code",
"execution_count": 39,
"metadata": {},
"outputs": [],
"source": [
"def taxcalc (grosssalary, taxbands):\n",
" tax=0\n",
" for lb,ub,rate in taxbands:\n",
" if grosssalary< lb:\n",
" continue\n",
" elif (grosssalary>=lb) and (grosssalary<ub):\n",
" tax+=(grosssalary-lb)*rate\n",
" else:\n",
" tax+=(ub-lb)*rate\n",
" return tax\n",
" \n",
"def effective_paye_taxrate(numdays):\n",
" gross=gross_salary(numdays)\n",
" return (incometax(gross)+employeeNI(gross))/gross\n",
" \n",
"def effective_bnp_taxrate(numdays):\n",
" gross=gross_salary(numdays)\n",
" return (incometax(gross)+employeeNI(gross)+employerNI(gross))/gross \n",
"\n",
"def effective_bnp_taxrate2(numdays):\n",
" gross=gross_salary(numdays)\n",
" grossminusNI=gross-employerNI(gross)\n",
" return (incometax(grossminusNI)+employeeNI(grossminusNI)+employerNI(gross))/gross \n"
]
},
{
"cell_type": "code",
"execution_count": 40,
"metadata": {},
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},
"execution_count": 40,
"metadata": {},
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],
"source": [
"[(x,gross_salary(x),effective_bnp_taxrate2(x)-effective_paye_taxrate(x)) for x in range(1,250)]"
]
},
{
"cell_type": "code",
"execution_count": 47,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"net monthly salary paye 553.6629090909091\n",
"net monthly salary bnp1 427.9775272727273\n",
"net monthly salary bnp2 487.0496567272727\n"
]
}
],
"source": [
"r1=effective_paye_taxrate(220)\n",
"r2=effective_bnp_taxrate(220)\n",
"r3=effective_bnp_taxrate2(220)\n",
"print ('net monthly salary paye',gross_salary(220)*(1-r1)/220)\n",
"print ('net monthly salary bnp1',gross_salary(220)*(1-r2)/220)\n",
"print ('net monthly salary bnp2',gross_salary(220)*(1-r3)/220)"
]
},
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"250/5"
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