How to calculate your ITCs

A way to keep track of the GST/HST you paid or owe is by adding a column to the purchases and expenses side of your records. You can use that GST/HST column total to calculate your input tax credits (ITCs) for each reporting period. You can only claim ITCs to the extent that your purchases and expenses are for consumption, use, or supply in your commercial activities.

To be eligible for an ITC, an expense or purchase has to be reasonable in quality, nature, and cost in relation to the nature of your business. The ITC also has to be based on a reasonable purchase price.

See Guide RC4022, General Information for GST/HST Registrants, for line-by-line instructions on completing your GST/HST return.

Forms and publications