As of 1/7/19 most employers that have staff will need to use Single Touch Payroll (STP). This means that your wages information will be sent electronically to the Australian Taxation Office (ATO) EVERY PAY PERIOD.
If you have employees you should ensure that your bookkeeping software is STP compliant. Those not using software already you will need to investigate either a standalone STP solution or an electronic bookkeeping software package that includes Single Touch Payroll.
STP is already operating for employers that have 20 or more employees. It is extended to all employers as of 1/7/2019. Some exemptions may apply for non arms length employees or micro employers.