The monthly fee is first charged when you first hold a security as part of the US Investing service.
The monthly fee is:
A$2 / month (incl. GST) if you've paid the Spaceship Voyager monthly fee within the last month, otherwise;
A$4 / month (incl. GST).
The US Investing monthly fee will be direct debited from your linked bank account.
The monthly fee will continue to be charged on or around the same date of every month provided you continue to hold US securities. If you no longer hold US securities, you'll no longer be charged the monthly fee.