Where do you claim input tax credits (ITCs) to recover the taxes you paid on goods for resale and or exported out of the country?

If you are Self-Employed and a GST/HST Registrant, you do not include any GST/HST you may have collected or paid out in ITCs on your T1 General Income Tax Return. Registrants should keep all GST/HST collected on income and paid on expenses separately from the T2125 Business Statement on their personal tax return, and complete a GST/HST Return instead.

https://www.canada.ca/en/services/taxes/gsthst/gsthst-returns.html