australian-tax-rate

return tax rate based on annual income

usage:

  npm install australian-tax-rate

var taxRate = require('australian-tax-rate');
//...
var pay = gross*(1 - taxRate(gross));

This is what ATO says about personal tax:

Taxable income	Tax on this income
0 – $18,200	Nil
$18,201 – $37,000	19c for each $1 over $18,200
$37,001 – $80,000	$3,572 plus 32.5c for each $1 over $37,000
$80,001 – $180,000	$17,547 plus 37c for each $1 over $80,000
$180,001 and over	$54,547 plus 45c for each $1 over $180,000

Above as graphs: