Update 25th March 2020
This area is changing quickly as the government changes it and changes it again and the ATO and law makers try and put this in place on short notice.
Some more detailed information is now available at the ATO here https://www.ato.gov.au/Business/Business-activity-statements-(BAS)/In-detail/Boosting-cash-flow-for-employers/
In short on your March BAS you will receive a minimum credit equal to your PAYG tax witheld or $10,000 and a maximum credit of $50,000. You will then get a further bonus of this amount again over the next 6 months. There is a little more to it than that so if you want more details please have a read of the ATO article or get in contact with us.