Hello @jmkentel ,
There is a reason this may happen, if you have edited any sales transactions from a previously filed period by changing the date of the transaction to the current period. Below is an example of a period that has already been filed.
Now I'm going to change the date on an $8,000 invoice, moving it to the current period. The tax summary report for the previous period, now looks like this.
Now I'm going to look at the summary for the current period:
Note that the Sales have been added to the current period, but Line 103 shows as $0.00. (This is a Test file so I have no other data in the current period). So now, if you were to multiply your revenue by 5%, the $400.00 result is greater than what is showing in Line 103.
Only when double-clicking on Line 103, do you get the detail which shows -400.00 balance forward (QB recognizes that you have already filed tax for this transaction), and a +400.00 in the current period, = $0.00
Bottom line is that if you change the date on an invoice where tax has already been filed, Line 101 is reduced in the old period and increased in the new period (or vice versa for a credit memo), but Line 103 is not adjusted because it takes into account what you already filed, resulting in a $0.00 tax collected in the current period.
It should be noted that when Line 106 ITC's are posted to a period in which you have already filed, the adjustments are allowed, by CRA, to be carried forward from the previous period. QB takes this into account and the ITC's are carried forward to the current period. However, if the sales figure (Line 101) changes by changing the date on a sales invoice, a GST amendment must be filed with CRA. In the example above, I would have had to file an amendment for the previous period sales (2019).
Hope this helps :)