Jan 31, 2018 Find out about input tax credits. As a GST/HST registrant, you recover the GST/HST paid or payable on purchases and expenses related to your commercial activities by claiming input tax credits (ITCs). You may be eligible to claim ITCs only to the extent that your purchases and expenses are for consumption, use, or supply in your commercial activities. Such expenses can be fed as ‘Tax Paid Expense (2)’ in BUSY. Although you have paid the tax but since your GSTIN is not printed on the bill it cannot be covered under ‘Registered Expense (2)’. At the same time RCM is also not required to be paid as invoice is GST paid.