Yes, you can use specially formatted urls to automatically apply variables and auto-calculate.
                    
                        - 
                            Income 
q=[number] required
                            This is required for the link to work. It can be any hourly, weekly or annual before tax income.
                         
                        - 
                            KiwiSaver 
k=[number] optional
                            The percentage you contribute towards KiwiSaver. The default assumes you have opted out.
                         
                        - 
                            Student Loan 
l=y optional
                            Apply this if you have a student loan. The default assumes you don't have a loan.
                         
                        - 
                            Hours worked per week 
h=[number] optional
                            The default assumes you work 40 hours per week.
                         
                    
                    For example, if you earn $42 per hour, work 45 hours per week, have a student loan and contribute 3% towards KiwiSaver your URL would look like https://www.paye.net.nz/calculator/?q=42&h=45&l=y&k=3