Hi Zoe,
First create a new Distribution code that is defined as 'tax included' and assign the HST GL account and the appropriate tax rate (12% for BC). It is better to leave the Expense GL account (and department) blank so that you only have to create one generic code, rather than a separate code per expense.
On the AP Vendor record, you can assign a default distribution code so that every time an invoice is created for this vendor, that distribution code is automatically assigned. Pick this new code. You can also assign a default GL account (and department) on the vendor record so that not only will the HST-include part default for a vendor invoice but so will the expense GL account.
You can choose to export and re-import these changes for your vendors, so you don't have to edit each vendor individually.
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Regards,
Softrak Tech Support