UK National Insurance Calculator

A basic standalone UK National Insurance calculator. See http://www.hmrc.gov.uk/rates/nic.htm for more details on rates.

Usage options:

var NationalInsuranceCalculator = require('uk-national-insurance');
var annualNationalInsuranceRepayment = NationalInsuranceCalculator(40000, '2013_14');

Resulting in annualNationalInsuranceRepayment:

4119.84