You missed this information on the form: "If the tax is $2 or less, you
do not have to make a payment." Since it is a monthly calculation, you have no amount owing for the past (unless you bought other stuff (other than tangible goods) from non-residents online and did not pay GST/HST to the vendor).

Some people will soon be paying $13.99 per month. For Ontario subscribers, it means $1.82 HST per month (still below $2). However, subscribers in the Atlantic provinces (15% HST) will now be over the $2 threshold...