This is a basic tax calculator only base on 2019 tax rates for resident individuals. Seek proper advise for your individual case. I developed it for personal use
https://jscalc.io/calc/UCXrlqHqluMQelog
I hope this calculator is helpful to new expats coming to PNG:
Select/Input Values left hand side
Most of expats would fall in medium cost/ high cost housing. If sharing then low cost
Use Sell TT rate for Exchange rate conversion
http://www.bsp.com.pg/About-Us/Rates--Fees/Exchange-Rates.aspx