Do you or your partner have paid work?
The Big Kahuna would affect you in several ways. First, if you’re 18 or older, you would receive the Unconditional Basic Income or UBI (which has no tax to pay), irrespective of whether you had paid work or not, or what hours you worked. The Big Kahuna sets the UBI at $8,500 for those aged 18 to 20 and $11,000 for those aged 21 and over, but it could be set at any level (as long as the tax rate was altered to fund it). The UBI could be paid into your account fortnightly just like any other regular income. If you have a partner, they would receive the UBI too, at exactly the same level as you do - recognising that they are an individual in their own right.
Second, you would face a single tax rate on all other income you receive of 30%, not progressive taxes like at present. So if, on top of the UBI, you earned $100 gross a week from a paying job you would pay $30 a week in tax and keep $70. All up in a year you would have net income of $11,000 (from the UBI) plus 52 weeks of $70 ($3,640) or $14,640 in total.
Third, there would be no Working for Families anymore. If you have a partner and fewer than 4 children it is likely the two UBIs coming into your family would more than replace the Working for Families tax credits you currently receive.
Fourth, if you own your own home or a business (including investment property) you would be liable for a new tax – the Comprehensive Capital Tax or CCT.
The calculator shows you how your net income would be affected by the Big Kahuna policy (it takes into account your wages, tax, what you currently get from Working for Families and the new CCT applied to your home but ignores any business you may own). The calculator is based on the default UBI ($11,000) and flat tax rate (30%). To see what other levels are possible, have a go at the Finance Minister calculator.