You can change your KiwiSaver contribution rate by completing a ‘KiwiSaver deduction (KS2) form’ and giving it to your employer. If you are working for a large company, provide your HR department with the completed KS2 form. If you are working for a smaller company, provide it to your boss. Once your employer receives the completed KS2 form, the change in contribution rate will be initiated. Do note that you can only change your contribution rate once every three months, and you can choose to contribute between 3% and 10% of your gross pay.