If you go to tax groups that include import duties in the "File Maintenance" option you need to setup the following jurisdictions. Depending on what GST is calculated, you must decide what your first jurisdiction must be.
Method one: GST on $100.00
1. Create a Jurisdiction for GST.
On the first screen you will find an option "Taxable Yes/No". Select "No" because you do not want the next jurisdiction to include GST. On the second screen insert 8.00 for all taxable items and 8.00 for the first vendor status and 0.00 for the non-taxable items.
2. Create a Jurisdiction for IMPORT
On the first screen select "Yes" for the option "Taxable" because you want the next jurisdiction to calculate ASD on the amount including IMPORT. On the second screen insert 10.00 (import %) for all taxable items/vendors
3. Create Jurisdiction for ASD
On the first screen select "No" because this is the last jurisdiction. On the seconds screen select taxable item 1 - 5%
taxable item 2 - 10%
taxable item 3 - 15% etc.
You can select 15% for all vendor tax statuses except non-taxable (highest %).
Method 2: GST on $110.00
Move IMPORT jurisdiction to first jurisdiction and select Taxable "Yes". The GST must be second and then ASD. If the ASD is calculated on added value, Import item $100 + 10% = $110.00 and GST $110 + 10% = $121 then GST must be setup as Taxable "Yes" else if ASD is calculated on $110 then setup GST as Taxable "No".
Method 3: GST on $121
Move IMPORT to first jurisdiction, then ASD then GST with ASD Taxable "Yes".
TAX GROUP NO IMPORT
Create the same jurisdictions ASD and GST as above, leave jurisdiction for IMPORT.