1.  When your business opened in 2020 and you do not have 2019 turnover figures
To demonstrate turnover between $75,000 and $50 million (inclusive), you need to provide one quarterly business activity statement (BAS), or 3 individual monthly BAS. The reported turnover will be annualised.
You will also need to show that your business experienced a decline in turnover of 30% or more over a minimum 2-week period between 26 June and 17 July 2021 compared to a comparable period during the first 3 quarters of the 2020-21 financial year.
2.  When your business was not operational for the full 2019-20 financial year
You'll need to show that your business experienced a decline in turnover of 30% or more due to the public health order over a minimum 2-week period between 26 June and 17 July 2021 compared to the 2-week period immediately before the Greater Sydney lockdown commenced (12 to 25 June 2021).
3.  If your 2019-20 turnover figures are not representative of your usual turnover
You can demonstrate an alternative annual turnover of between $75,000 and $50 million by providing either an Australian tax return for the 2018-19 financial year or one quarterly business activity statement (BAS), or 3 individual monthly BAS, from any of the first 3 quarters of the 2020-21 financial year.
4.  If June and July 2019 were not representative of your usual turnover
You can show that your business experienced a decline in turnover of 30% or more due to the public health order over a minimum 2-week period between 26 June to 17 July 2021 compared to: 
. the same period in June and/or July 2019, or; 
. the same period in 2020, or
. the 2-week period immediately before the Greater Sydney lockdown commenced (12 to 25 June 2021).

Source: Service NSW