The subsidy of $585 a week for full-time staff, and $350 for part-time staff, helps employers cover their wages over a two-week period.
To be eligible, businesses must have experienced a 40 per cent decline in revenue because of the alert level change, compared to a typical two-week period in the six weeks before the alert level changes.
Applications close at midnight on Sunday.
Under the original wage subsidy scheme, announced during last year's nationwide lockdown, and the two subsequent schemes, $14 billion was paid out.