{
 "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": {},
   "outputs": [
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       " (249, 236550, 0.0704710315789473)]"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "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)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [
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     "data": {
      "text/plain": [
       "0.4171969377990431"
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     "execution_count": 42,
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    "r1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [
    {
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      "text/plain": [
       "0.5494973397129187"
      ]
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     "execution_count": 43,
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   ],
   "source": [
    "r2"
   ]
  },
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   "execution_count": 44,
   "metadata": {},
   "outputs": [
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     "data": {
      "text/plain": [
       "0.48731615081339713"
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     "execution_count": 44,
     "metadata": {},
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   ],
   "source": [
    "r3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "50.0"
      ]
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     "execution_count": 48,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "250/5"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "hello from laptop"
   ]
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